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HomeMy WebLinkAbout2016-01-25 ISG Drainage Maps & Calculations MEMORANDUM DATE: January 25, 2016 TO: Scott D. Richards FROM: Lynn Bruns SUBJECT: Pizza Ranch —Oak Park Heights Drainage Maps &Calculations In conjunction with the site plans, drainage maps and calculations have been completed for the site plan review of the proposed Pizza Ranch in the City of Oak Park Heights. Water quantity calculations were completed using hydraulic models developed by utilizing the design data and the HydroCAD computer modeling system. Hydrographs for existing and proposed scenarios were generated and routed through these models using the Atlas-14 rainfall distribution. Stormwater management requirements for the site has been satisfied through an existing regional pond located to the south. On site BMP's will consist of grass swales and a flat sedimentation area to provide some additional pre-treatment for runoff from the site. The existing site is undeveloped greenspace and has been separated into three drainage areas. The majority of the site (EX DA-2) drains to the existing State Trunk Highway No. 5 ditch. The ditch slopes to the south and outlets into the existing regional pond to the south of the site. Another portion of the site (EX DA-1)drains into an existing swale which also outlets to the existing regional pond. A small part of the site (EX DA-3) drains to the west via overland flow and eventually reaches the regional pond. An offsite drainage area (EX DA-4) consisting of Morning Dove Avenue and a portion of the existing bank property to the north has been included in the watershed and also currently drains to the west of the site. This drainage area will be re-routed in the proposed design so that stormwater runoff will travel through the proposed swale to be constructed in the drainage easement. The ultimate outfall of the drainage area will be unchanged. A detailed map depicting the existing drainages areas is enclosed. The proposed site will consist of a 5,705 S.F building, parking lot, landscaped areas and drainage swale. Two drainage areas (DA-2 and DA-3) will drain to the east into the existing State Trunk Highway No. 5 ditch. Two areas (DA-5 and DA-6) will drain through curb cuts on the south end of the parking lot and into the proposed swale. A small portion of the site (DA-4) will drain to the curb cut located in the cul de sac of Morning Dove Avenue. The rest of the site (DA-7) will drain directly into the proposed swale via overland flow. The off site flow to the proposed swale through the curb cut in the Morning Dove Avenue cul de sac (DA-1) has been included to properly size the swale to be constructed in the drainage easement. A detailed map depicting the proposed drainages areas is enclosed. Enclosures: Existing Site Drainage Areas Proposed Site Drainage Areas Existing HydroCAD Report Proposed HydroCAD Report AM =_ .e,,�, \ ISG 1., ,_,N \ / ;, N\ I+S GROUP , I i /7 i ) // ''''N / II 7 7 \- ,,,/,,,,„ , N 1 l',,\'_2-, 5 h , , _°, i ; / , , , , •:\ ��\ ... .-. /fi •• 1�y\> //ii,,,,,i%, ZiiW<i:rEi wao,�.,Eo,���,.EASINGROW MOON ITV, N ‘\ LOT 2 // /-// iF// `-`�_ /'/ ,‘-,q///,//i)"// did'/ ,-/ I. / I I� / / %%,///j//// PIZZA RANCH / �/ ,/�h,,9/,/ / RESTAURANT � ✓/ . : I / '////// �: `•..- / 3 -�-^a / / / ///// / e P EXISTING SITE .\., •+�///4// ,g y//,//// '�a DRAINAGE AREAS �,- 4t,////// /// // / '1 ,(w 4• $ Q C If(/ ///-„,7 ,l \// // /,���``� MEM— / im //ri/////f/'•• •_ / 7.a'///////ii/i/ / e”/ :..M.. Scale: 1 OF 2 / /,/ ,///////// -' / /.'r////,/ / ,/ fl . • f / `�-;t "� ISG .. . ` � �/. is ---* .N Paw_^ N ` , \ \ 11-S GROUP / / / !`% \ 1 '' ',T N \ N y ' /:, / I MSS CONTOUR /'... QST . ` ;,"., otia / . , / ''''' (1‘) ' kc At- ---/ , , ( „....„, ) \r—,., ,,,,,N. ,:w ,/ ,, , \. �, � '\ .PROPOSES man 41 -' - A ;j% /�f�\ / a a i / —— 1' /..„-LOT 2 /�//� i. � . ''' / 8 .47,,,,z,,/// / i / a„�I�•°' y�////// PIZZA RANCH / t/i/j RESTAURANT µ OAN PAW HEIGHTS MINNESOTA x - 0a ' ;/�///„ , , , ,4q ,,III4di (/ i/ // A / � lii, / / �' �/ �` //y„////// /, 5 mom , tea-A r, /i/ / / �\`> .� i i/. `ate ”T, r;4i/i/i/ ^` N �M�a. .— . — \I !/ ////// '`°%,\N\N., \N ��s;// //%/i/ ?od'. t//r K 'y.,'4e,///;/ x, 7 /, _(,7:;4s PROPOSED SITE C � / YY'Vf. S/ // /',,./7////////// ' DRAINAGE AREAS ///// /// //// \ , / I/////V///;,�/j // Scale: 2 OF 2 <4S> EX DA-4 7R 0 Overland to Existing Memorial ve. N Ditch EX DA-3 EX DA-2 EX DA-1 5R 6R Existing Swale Existing Highway 5 Road Ditch 8R 4 Flow To Existing Pond KSubca) Reach 'on• Link Routing Diagram for 18332 Existing Conditions Prepared by ISENGINEERS, Printed 1/25/2016 HydroCAD®10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC 18332 Existing Conditions Prepared by ISENGINEERS Printed 1/25/2016 HydroCADO 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.111 69 50-75% Grass cover, Fair, HSG B (15, 2S, 3S, 4S) 0.494 98 Paved parking, HSG B (4S) 2.605 74 TOTAL AREA 18332 Existing Conditions Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD®10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.605 HSG B 1S, 2S, 3S, 4S 0.000 HSG C 0.000 HSG D 0.000 Other 2.605 TOTAL AREA 18332 Existing Conditions Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 2.111 0.000 0.000 0.000 2.111 50-75% Grass cover, Fair 1S, 2S, 3S, 4S 0.000 0.494 0.000 0.000 0.000 0.494 Paved parking 4S 0.000 2.605 0.000 0.000 0.000 2.605 TOTAL AREA IIS j 1 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 5 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: EX DA-1 Runoff Area=0.303 ac 0.00% Impervious Runoff Depth>0.57" Flow Length=140' Slope=0.0220 '/' Tc=10.4 min CN=69 Runoff=0.19 cfs 0.014 af Subcatchment2S: EX DA-2 Runoff Area=1.196 ac 0.00% Impervious Runoff Depth>0.57" Flow Length=280' Slope=0.0100 '/' Tc=15.8 min CN=69 Runoff=0.65 cfs 0.057 af Subcatchment3S: EX DA-3 Runoff Area=0.095 ac 0.00% Impervious Runoff Depth>0.57" Flow Length=80' Slope=0.0050 '/' Tc=15.2 min CN=69 Runoff=0.05 cfs 0.004 af Subcatchment4S: EX DA-4 Runoff Area=1.011 ac 48.86% Impervious Runoff Depth>1.29" Flow Length=430' Tc=7.0 min CN=83 Runoff=2.14 cfs 0.109 af Reach 5R: Existing Swale Inflow=0.19 cfs 0.014 af Outflow=0.19 cfs 0.014 af Reach 6R: Existing Highway 5 Road Ditch Inflow=0.65 cfs 0.057 af Outflow=0.65 cfs 0.057 af Reach 7R: Overland to Existing Memorial Ave.N Ditch Inflow=2.16 cfs 0.113 af Outflow=2.16 cfs 0.113 af Reach 8R: Flow To Existing Pond Inflow=2.55 cfs 0.184 af Outflow=2.55 cfs 0.184 af Total Runoff Area = 2.605 ac Runoff Volume = 0.184 af Average Runoff Depth = 0.85" 81.04% Pervious = 2.111 ac 18.96% Impervious = 0.494 ac 18332 Existing Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1S: EX DA-1 Runoff = 0.19 cfs @ 12.14 hrs, Volume= 0.014 af, Depth> 0.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.303 69 50-75% Grass cover, Fair, HSG B 0.303 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.0220 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.3 40 0.0220 2.22 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.4 140 Total Subcatchment 1S: EX DA-1 Hydrograph 7 0.21 ❑Runoff 0.2 i 0.19 cfs 0.19 fe_text_mean - Stillwater 017 MN 24-hr SO 2-yr 0.16 Rainfall=2.81" 0.15 0.14 Runoff Area=0.303 ac 0.13 Runoff Volume=0.014 af H 0.12 0.11 Runoff Depth>0.57" LL 009 Flow Length=140' 0.0; Slope=0.0220 '/' 0.06 Tc=10.4 min0.05 j 0.04 CN=69 0.03 0.02 0.01 ®`I///////// /!////!/!////////' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 2S: EX DA-2 Runoff = 0.65 cfs @ 12.23 hrs, Volume= 0.057 af, Depth> 0.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 1.196 69 50-75% Grass cover, Fair, HSG B 1.196 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 100 0.0100 0.12 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 2.0 180 0.0100 1.50 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 15.8 280 Total Subcatchment 2S: EX DA-2 Hydrograph 0 7 ❑Runoff 0.65 cfs I 0.65 fe_text_mean - Stillwater 0.6 MN 24-hr SO 2-yr 0.55 Rainfall=2.81" 0 5 Runoff Area=1.196 ac 0.45 wRunoff Volume=0.057 af 0.4 0.35 Runoff Depth>0.57" <47 LL 0.3 Flow Length=280' 0.25 Slope=0.0100 '/' 0.2 Tc=15.8 min :. 0.15 CN=69 oi 0.05 ,, ��j42740),///////.// //.drA/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 3S: EX DA-3 Runoff = 0.05 cfs @ 12.22 hrs, Volume= 0.004 af, Depth> 0.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.095 69 50-75% Grass cover, Fair, HSG B 0.095 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 80 0.0050 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment 3S: EX DA-3 Hydrograph z 0 Runoff 0.055 l 0.05 ors J fe text mean - Stillwater 0.05 — MN 24-hr SO 2-yr 0.045 wor Rainfall=2.81" 0.04 Runoff Area=0.095 ac w 0.035 Runoff Volume=0.004 af 0.03 Runoff Depth>0.57" j LL 0.025 Flow Length=80' OA 0.02 Tc=15.2 .mon 0 '/, 0.015 CN=69 0.01 0.005 ��.609�� ��ii�� 0 ����������������������������������������///,.% �� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 4S: EX DA-4 Runoff = 2.14 cfs @ 12.06 hrs, Volume= 0.109 af, Depth> 1.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.494 98 Paved parking, HSG B 0.517 69 50-75% Grass cover, Fair, HSG B 1.011 83 Weighted Average 0.517 51.14% Pervious Area 0.494 48.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.6 250 0.0060 1.57 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 80 0.0050 0.49 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 6.7 430 Total, Increased to minimum Tc = 7.0 min Subcatchment 4S: EX DA-4 Hydrograph 0 Runoff 2.14cfs fe text mean - Stillwater' 2 — — MN 24-hr SO 2-yr Rainfall=2.81" Runoff Area=1.011 ac Runoff Volume=0.109 af Runoff Depth>1 .29" Flow Length=430' 00 Tc_7.0min i0 CN-83 ilii«i,„„i -- .03.4-7-010i7 ” 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 10 Summary for Reach 5R: Existing Swale Inflow Area = 0.303 ac, 0.00% Impervious, Inflow Depth > 0.57" for 2-yr event Inflow = 0.19 cfs @ 12.14 hrs, Volume= 0.014 of Outflow = 0.19 cfs @ 12.14 hrs, Volume= 0.014 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 5R: Existing Swale Hydrograph IN Inflow 0.21 'o.19 cfs I E Outflow Inflow Area=0.303'°:9cs 0 19 0.10.177 0.16 0.15 if; 0.14' 0.13 +� 0.12 0.11 0 0.1 0.09 %± 0.07 0.06 0.05 0.04 10 0.03: 0.02 .. 0.01 ��gs. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 11 Summary for Reach 6R: Existing Highway 5 Road Ditch Inflow Area = 1.196 ac, 0.00% Impervious, Inflow Depth > 0.57" for 2-yr event Inflow = 0.65 cfs @ 12.23 hrs, Volume= 0.057 af Outflow = 0.65 cfs @ 12.23 hrs, Volume= 0.057 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 6R: Existing Highway 5 Road Ditch Hydrograph ■Inflow MEM p Outflow 0.7 0.65 Inflow Area=1 .196 '- 0.6 1 0.55 0 0.5 E 0.45 4 I f 0.35 I.` 0.3 0.25 0.2 0.15 0.05 /r'- f .rrrr�v €r/seieriia+ii/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 12 Summary for Reach 7R: Overland to Existing Memorial Ave. N Ditch Inflow Area = 1.106 ac, 44.67% Impervious, Inflow Depth > 1.23" for 2-yr event Inflow = 2.16 cfs @ 12.06 hrs, Volume= 0.113 af Outflow = 2.16 cfs @ 12.06 hrs, Volume= 0.113 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 7R: Overland to Existing Memorial Ave. N Ditch Hydrograph ®Inflow Outflow Inflow Area=1 .106 2 i O jP' LL tea/p .��,r 0 r^w+'e �«',/ ___,y1 ,.. 22 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 13 Summary for Reach 8R: Flow To Existing Pond Inflow Area = 2.605 ac, 18.96% Impervious, Inflow Depth > 0.85" for 2-yr event Inflow = 2.55 cfs @ 12.07 hrs, Volume= 0.184 af Outflow = 2.55 cfs @ 12.07 hrs, Volume= 0.184 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 8R: Flow To Existing Pond Hydrograph / ®Inflow 12.55 cfs 1 0 Outflow Inflow Area=2.6051x5, r 2 10": 7/7 15,1 LL 0000 o 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 14 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: EX DA-1 Runoff Area=0.303 ac 0.00% Impervious Runoff Depth>1.38" Flow Length=140' Slope=0.0220 '/' Tc=10.4 min CN=69 Runoff=0.54 cfs 0.035 of Subcatchment2S: EX DA-2 Runoff Area=1.196 ac 0.00% Impervious Runoff Depth>1.37" Flow Length=280' Slope=0.0100'/' Tc=15.8 min CN=69 Runoff=1.83 cfs 0.137 af Subcatchment3S: EX DA-3 Runoff Area=0.095 ac 0.00% Impervious Runoff Depth>1.38" Flow Length=80' Slope=0.0050 '/' Tc=15.2 min CN=69 Runoff=0.15 cfs 0.011 of Subcatchment4S: EX DA-4 Runoff Area=1.011 ac 48.86% Impervious Runoff Depth>2.43" Flow Length=430' Tc=7.0 min CN=83 Runoff=4.03 cfs 0.205 af Reach 5R: Existing Swale Inflow=0.54 cfs 0.035 of Outflow=0.54 cfs 0.035 af Reach 6R: Existing Highway 5 Road Ditch Inflow=1.83 cfs 0.137 of Outflow=1.83 cfs 0.137 af Reach 7R: Overland to Existing Memorial Ave.N Ditch Inflow=4.11 cfs 0.216 af Outflow=4.11 cfs 0.216 of Reach 8R: Flow To Existing Pond Inflow=5.59 cfs 0.388 of Outflow=5.59 cfs 0.388 of Total Runoff Area = 2.605 ac Runoff Volume = 0.388 af Average Runoff Depth = 1.79" 81.04% Pervious = 2.111 ac 18.96% Impervious = 0.494 ac 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 1S: EX DA-1 Runoff = 0.54 cfs @ 12.11 hrs, Volume= 0.035 af, Depth> 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.303 69 50-75% Grass cover, Fair, HSG B 0.303 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.0220 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.3 40 0.0220 2.22 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.4 140 Total Subcatchment 1S: EX DA-1 Hydrograph 0.6 / [ZR I 054 cfs� 0.55 fe_text_mean - Stillwater 04 0.5 MN 24-hr SO 10-yr 0.45 Rainfall=4.17" 0.4 Runoff Area=0.303 ac 01 , 0.35 Runoff Volume=0.035 of 0.3 Runoff Depth>1.38" 11, IT 0.25 Flow Length=140' 00 02 Slope=0.0220 '/' 094 ot 0.15 Tc=10.4 min / 0.1 CN=69 0.05 /''��i��i���� 0 / // de/ /r'/ / �/////,f,/7,0741.0 ////// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 2S: EX DA-2 Runoff = 1.83 cfs @ 12.20 hrs, Volume= 0.137 af, Depth> 1.37" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 1.196 69 50-75% Grass cover, Fair, HSG B 1.196 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 100 0.0100 0.12 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 2.0 180 0.0100 1.50 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 15.8 280 Total Subcatchment 2S: EX DA-2 Hydrograph 2 0 Runoff 11.83 cfs I fe_text_mean - Stillwater MN 24-hr SO 10-yr Rainfall=4.17" Runoff Area=1.196 ac Runoff Volume=0.137 af Runoff Depth>1.37" LL Flow Length=280' Slope=0.0100 '/' Tc=15.8 min ` CN=69 ////✓✓/////� 1 o / /r// '✓r'l �' �//� f/./ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD®10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 3S: EX DA-3 Runoff = 0.15 cfs @ 12.19 hrs, Volume= 0.011 af, Depth> 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.095 69 50-75% Grass cover, Fair, HSG B 0.095 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 80 0.0050 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment 3S: EX DA-3 Hydrograph 0.16 / D Runoff 0.15 Iotscfs� fe text mean - Stillwater 0.14 — — 0.13 MN 24-hr SO 10-yr 0.12 Rainfall=4.17" 0.11 Runoff Area=0.095 ac 01 00, Runoff Volume=0.011 af �/ 0.09 0 0 0 Runoff Depth>1.38" A 0.07 Flow Length=80' 0.05 Tc=15.2 .mOn 50 ,/, l 0.04 0.03 CN=69 0.02 0.01 / #//// o 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 4S: EX DA-4 Runoff = 4.03 cfs @ 12.05 hrs, Volume= 0.205 af, Depth> 2.43" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.494 98 Paved parking, HSG B 0.517 69 50-75% Grass cover, Fair, HSG B 1.011 83 Weighted Average 0.517 51.14% Pervious Area 0.494 48.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.6 250 0.0060 1.57 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 80 0.0050 0.49 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 6.7 430 Total, Increased to minimum Tc = 7.0 min Subcatchment 4S: EX DA-4 Hydrograph Runoff 14.03 cfs 4 fe text mean - Stillwater MN 24-hr SO 10-yr Rainfall=4.17" 3 Runoff Area=1.011 ac Runoff Volume=0.205 af I Lq 2 Runoff Depth>2.43" to Flow Length=430' 110 Tc=7.0 min !/ 1 CN=83 j o %//////!/!!///////////////////////////!///� !!!!!/!!//!!/!�•/®///////ezez!G 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 19 Summary for Reach 5R: Existing Swale Inflow Area = 0.303 ac, 0.00% Impervious, Inflow Depth > 1.38" for 10-yr event Inflow = 0.54 cfs @ 12.11 hrs, Volume= 0.035 of Outflow = 0.54 cfs @ 12.11 hrs, Volume= 0.035 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 5R: Existing Swale Hydrograph / ®Inflow 0.6 10.54.cfs I 0 Outflow 0.55 Inflow Area=0.303"cfs 0.5 1;4; 0.45 l4 0.4 Irge, y 0.35 rot 0.3 u` 0.25 : 0.2 /� 0.15 �f✓/; 0.1 0.05 7x- o ��/1`/ir.0 fie././.. . 00 "..i 'fig'//,��s2/'. °. a , "` ,1 .• a/" t-,'s..,sfif 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 20 Summary for Reach 6R: Existing Highway 5 Road Ditch Inflow Area = 1.196 ac, 0.00% Impervious, Inflow Depth > 1.37" for 10-yr event Inflow = 1.83 cfs @ 12.20 hrs, Volume= 0.137 af Outflow = 1.83 cfs @ 12.20 hrs, Volume= 0.137 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 6R: Existing Highway 5 Road Ditch Hydrograph ®Inflow 2 111313p Outflow Inflow Area=1 .196 ` e4 ss/ O LL 1 d r :°9: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 21 Summary for Reach 7R: Overland to Existing Memorial Ave. N Ditch Inflow Area = 1.106 ac, 44.67% Impervious, Inflow Depth > 2.34" for 10-yr event Inflow = 4.11 cfs @ 12.05 hrs, Volume= 0.216 af Outflow = 4.11 cfs @ 12.05 hrs, Volume= 0.216 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 7R: Overland to Existing Memorial Ave. N Ditch Hydrograph / ■Inflow 14.,,ofsI fl Outfow� Inflow Area=1 .10616 4 3 1 (14 LL 2 e .P".c*earfs° .N°' /=«' a'a''a! ,.s"' �. 0 .0//eilr /'11Fs"xs'✓rm ' r 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 22 Summary for Reach 8R: Flow To Existing Pond Inflow Area = 2.605 ac, 18.96% Impervious, Inflow Depth > 1.79" for 10-yr event Inflow = 5.59 cfs @ 12.07 hrs, Volume= 0.388 af Outflow = 5.59 cfs @ 12.07 hrs, Volume= 0.388 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 8R: Flow To Existing Pond Hydrograph ■Inflow 6 D Outflow Inflow Area=2.605 5 0Or° 4 0 3 /�/ L 2 1 ' i /sk'�'.%''✓ '�`f', s:',�"A"td'.s`fsw✓'.a'`if6.�`':P`.F.?�`o`'• '�`s���' �:' � r,� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCADO 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Pacie 23 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: EX DA-1 Runoff Area=0.303 ac 0.00% Impervious Runoff Depth>2.12" Flow Length=140' Slope=0.0220 '/' Tc=10.4 min CN=69 Runoff=0.85 cfs 0.054 af Subcatchment2S: EX DA-2 Runoff Area=1.196 ac 0.00% Impervious Runoff Depth>2.12" Flow Length=280' Slope=0.0100'/' Tc=15.8 min CN=69 Runoff=2.81 cfs 0.211 af Subcatchment3S: EX DA-3 Runoff Area=0.095 ac 0.00% Impervious Runoff Depth>2.12" Flow Length=80' Slope=0.0050 'P Tc=15.2 min CN=69 Runoff=0.23 cfs 0.017 af Subcatchment4S: EX DA-4 Runoff Area=1.011 ac 48.86% Impervious Runoff Depth>3.38" Flow Length=430' Tc=7.0 min CN=83 Runoff=5.39 cfs 0.285 af Reach 5R: Existing Swale Inflow=0.85 cfs 0.054 af Outflow=0.85 cfs 0.054 af Reach 6R: Existing Highway 5 Road Ditch Inflow=2.81 cfs 0.211 af Outflow=2.81 cfs 0.211 af Reach 7R: Overland to Existing Memorial Ave.N Ditch Inflow=5.52 cfs 0.302 af Outflow=5.52 cfs 0.302 af Reach 8R: Flow To Existing Pond Inflow=7.96 cfs 0.567 af Outflow=7.96 cfs 0.567 af Total Runoff Area = 2.605 ac Runoff Volume = 0.567 af Average Runoff Depth = 2.61" 81.04% Pervious = 2.111 ac 18.96% Impervious = 0.494 ac 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 1S: EX DA-1 Runoff = 0.85 cfs @ 12.10 hrs, Volume= 0.054 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.303 69 50-75% Grass cover, Fair, HSG B 0.303 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.0220 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.3 40 0.0220 2.22 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.4 140 Total Subcatchment 1S: EX DA-1 Hydrograph 7 0.9 D Runoff 0.85 cfs 0.85 fe text mean - Stillwater 0.75. MN 24-hr SO 25-yr 017 Rainfall=5.23" �0 6 Runoff Area=0.303 ac Z- 0.55 Runoff Volume=0.054 af 045 Runoff Depth>2.12" LL 0.4 Flow Length=140' 0.35 Slope=0.0220 '/' 0.3 0.25 Tc=10.4 min . 02 CN=69 0.15 0.1 0.06 fvo,/..e'i/../i�..t i�.�..1�I"/vrJ'.��o%��i/'/f/ �/����/rfir'./�F✓,�.�� ZII;�ef. .0..../.V'.V%/.�i'.IA..;007/'.�..ee%0// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 2S: EX DA-2 Runoff = 2.81 cfs @ 12.19 hrs, Volume= 0.211 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 1.196 69 50-75% Grass cover, Fair, HSG B 1.196 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 100 0.0100 0.12 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 2.0 180 0.0100 1.50 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 15.8 280 Total Subcatchment 2S: EX DA-2 Hydrograph / 0 Runoff 3 12.81 cfs I fe_text_mean - Stillwater MN 24-hr SO 25-yr Rainfall=5.23" 00.1 2 Runoff Area=1.196 ac to Runoff Volume=0.211 af Runoff Depth>2.12" LL Flow Length=280' Slope=0.01001 'I' Tc-15.8 min // CN=69 '4497/7, i/./!//.402///./!e 171, /// ...74(0077/ •{1,�a//./. ///��./" ��,s.�,/f/��/!// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment 3S: EX DA-3 Runoff = 0.23 cfs @ 12.18 hrs, Volume= 0.017 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.095 69 50-75% Grass cover, Fair, HSG B 0.095 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 80 0.0050 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment 3S: EX DA-3 Hydrograph 0.25 p Runoff 0.24 1 0.23 cfs 0.23; 0.22( fe_text_mean - Stillwater 002 MN 24-hr SO 25-yr 0.18 Rainfall=5.23" °17 Runoff Area=0.095 ac 0.16 - 015 Runoff Volume=0.017 af • 0.14 • 012 Runoff Depth>2.12" LL• 0.11 Flow Length=80' 0.1 °.°9 Slope=0.0050 'P ,` 0.081;, 0.07 Tc=15.2 min 0.0 CN=69 f . 5 '5.: �0.03 00 �lIj/'/// // .////!////r".e/// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment 4S: EX DA-4 Runoff = 5.39 cfs @ 12.05 hrs, Volume= 0.285 af, Depth> 3.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.494 98 Paved parking, HSG B 0.517 69 50-75% Grass cover, Fair, HSG B 1.011 83 Weighted Average 0.517 51.14% Pervious Area 0.494 48.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.6 250 0.0060 1.57 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 80 0.0050 0.49 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 6.7 430 Total, Increased to minimum Tc= 7.0 min Subcatchment 4S: EX DA-4 Hydrograph 6 D Runoff I 5.39 cfs fe_text_mean - Stillwate 5 MN 24-hr SO 25-yr Rainfall=5.23" 4 Runoff Area=1.011 ac Runoff Volume=0.285 af 3 Runoff Depth>3.38" (% LL Flow Length=430' 2 Tc-7.0 min 1 CN=83 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 28 Summary for Reach 5R: Existing Swale Inflow Area = 0.303 ac, 0.00% Impervious, Inflow Depth > 2.12" for 25-yr event Inflow = 0.85 cfs @ 12.10 hrs, Volume= 0.054 af Outflow = 0.85 cfs @ 12.10 hrs, Volume= 0.054 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 5R: Existing Swale Hydrograph IO Inflow 0.9MIR 0 Outflow 0.85 Inflow Area=0.303 0.8 0.75 0.7 0.65 0.6t H 0.55 u 0.5 c 0.45 LL 0.4 0.35 0.3' 0.25 0.2 :: 05 .,, � 0 0.05 � ,g7%i/i/Ii!.ri/dir f, p .,f',//'/'���.✓.o�,�a/"/`',f'...�`.�°`.�''...F�,,�.s�*�".,a�'..�ad�''"`.�'. "`s�✓'`/".e.'i�`/,r'..�� �'"./`./'././'/'O/.'i°J/.f.//�.,r../.r"r.+/i/i�`.r�,P`i,% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 29 Summary for Reach 6R: Existing Highway 5 Road Ditch Inflow Area = 1.196 ac, 0.00% Impervious, Inflow Depth > 2.12" for 25-yr event Inflow = 2.81 cfs @ 12.19 hrs, Volume= 0.211 af Outflow = 2.81 cfs @ 12.19 hrs, Volume= 0.211 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 6R: Existing Highway 5 Road Ditch Hydrograph ®Inflow 1311311 0 Outflow 3 Inflow Area=1 .196 is . 2 0 N f LT 400 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 30 Summary for Reach 7R: Overland to Existing Memorial Ave. N Ditch Inflow Area = 1.106 ac, 44.67% Impervious, Inflow Depth > 3.27" for 25-yr event Inflow = 5.52 cfs @ 12.05 hrs, Volume= 0.302 of Outflow = 5.52 cfs @ 12.05 hrs, Volume= 0.302 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 7R: Overland to Existing Memorial Ave. N Ditch Hydrograph Inflow 6 15.52 cfs I 0 Outflow Inflow Area=1 .1061x ,. 5 4 N 0 3 f■ LL I% 2 VIII ♦♦♦///iii .10 .ldf° / w fIs a t /°f s` +�°r r � 'dre":i 3.•eieo/�sj°//'�. ice`: //'7.,:e7 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 31 Summary for Reach 8R: Flow To Existing Pond Inflow Area = 2.605 ac, 18.96% Impervious, Inflow Depth > 2.61" for 25-yr event Inflow = 7.96 cfs @ 12.07 hrs, Volume= 0.567 af Outflow = 7.96 cfs @ 12.07 hrs, Volume= 0.567 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 8R: Flow To Existing Pond Hydrograph / ®Inflow l 7.96cfs( 0 Outflow 8 Inflow Area=2.605 :6 l006 in 55 4/ 4 3 o/ 2 ØØ/ e,�P ...T .:r�,+.f.,f` .r',e,, s., -'`<,. .I��f/��z��������������s���.f���� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 32 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchmentl S: EX DA-1 Runoff Area=0.303 ac 0.00% Impervious Runoff Depth>3.66" Flow Length=140' Slope=0.0220 '/' Tc=10.4 min CN=69 Runoff=1.39 cfs 0.092 af Subcatchment2S: EX DA-2 Runoff Area=1.196 ac 0.00% Impervious Runoff Depth>3.66" Flow Length=280' Slope=0.0100'/' Tc=15.8 min CN=69 Runoff=4.61 cfs 0.364 af Subcatchment3S: EX DA-3 Runoff Area=0.095 ac 0.00% Impervious Runoff Depth>3.66" Flow Length=80' Slope=0.0050 'I' Tc=15.2 min CN=69 Runoff=0.37 cfs 0.029 af Subcatchment4S: EX DA-4 Runoff Area=1.011 ac 48.86% Impervious Runoff Depth>5.20" Flow Length=430' Tc=7.0 min CN=83 Runoff=7.57 cfs 0.438 af Reach 5R: Existing Swale Inflow=1.39 cfs 0.092 af Outflow=1.39 cfs 0.092 af Reach 6R: Existing Highway 5 Road Ditch Inflow=4.61 cfs 0.364 af Outflow=4.61 cfs 0.364 af Reach 7R: Overland to Existing Memorial Ave.N Ditch Inflow=7.80 cfs 0.467 af Outflow=7.80 cfs 0.467 af Reach 8R: Flow To Existing Pond Inflow=12.06 cfs 0.923 af Outflow=12.06 cfs 0.923 af Total Runoff Area = 2.605 ac Runoff Volume = 0.923 af Average Runoff Depth = 4.25" 81.04% Pervious = 2.111 ac 18.96% Impervious = 0.494 ac 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 33 Summary for Subcatchment 1S: EX DA-1 Runoff = 1.39 cfs @ 12.10 hrs, Volume= 0.092 af, Depth> 3.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.303 69 50-75% Grass cover, Fair, HSG B 0.303 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.0220 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.3 40 0.0220 2.22 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.4 140 Total Subcatchment 1S: EX DA-1 Hydrograph / ❑Runoff' 11.39 cfs i fe_text_mean - Stillwater MN 24-hr SO 100-yr Rainfall=7.18" 1 Runoff Area=0.303 ac Runoff Volume=0.092 af Runoff Depth>3.66" LL Flow Length=140' 0% Slope=0.0220 '/'Tc=10. CN 694 min �% l �l 0 /!f/,//.6/.f•t",/ !"jam` ./'.,�..��/': 6,7, 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 2S: EX DA-2 Runoff = 4.61 cfs @ 12.18 hrs, Volume= 0.364 af, Depth> 3.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 1.196 69 50-75% Grass cover, Fair, HSG B 1.196 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 100 0.0100 0.12 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 2.0 180 0.0100 1.50 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 15.8 280 Total Subcatchment 2S: EX DA-2 Hydrograph 5Q Runoff 14.61 cfs I fe_text_mean - Stillwater 4 MN 24-hr SO 100-yr Rainfall=7. Runoff A ea, vA 1.196 ac y 3 Runoff Volume=0.364 af Runoff Depth>3.66" LL Flow Length=280' 2 Slope=0.0100 'I' Tc=15.8 min -P``- 1 CN=69 %jam 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 3S: EX DA-3 Runoff = 0.37 cfs @ 12.17 hrs, Volume= 0.029 af, Depth> 3.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.095 69 50-75% Grass cover, Fair, HSG B 0.095 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 80 0.0050 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment 3S: EX DA-3 Hydrograph 0.4 D Runoff 10.37 cfs 0.36 fe text_mean - Stillwater 0.36 _ °.34 MN 24-hr SO 100-yr IV 0.32 0.3 Rainfall=7.18" j� °28 Runoff Area=0.095 ac 0.26 • 0 24 Runoff l 29 af • 0.22 Runoff Depth>3.66"3.66' j LL °O 8 Flow Length=80' 0.16 0.14 Slope=0.0050 '/' 0.12 Tc=15.2 min 0 08 CN=69 j 0 04 r /�eiiri 0.°0 iiiiiiriieisiisiiiiiiiiiiii,�.�i.iiiiii .,,�r��,,rr.ffeeor4...�.7:%srsr�,OrlZ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Paqe 36 Summary for Subcatchment 4S: EX DA-4 Runoff = 7.57 cfs @ 12.05 hrs, Volume= 0.438 af, Depth> 5.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.494 98 Paved parking, HSG B 0.517 69 50-75% Grass cover, Fair, HSG B 1.011 83 Weighted Average 0.517 51.14% Pervious Area 0.494 48.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.6 250 0.0060 1.57 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 80 0.0050 0.49 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 6.7 430 Total, Increased to minimum Tc= 7.0 min Subcatchment 4S: EX DA-4 Hydrograph 0 Runoff 8 i 7.57 cfs fe_text_mean - Stillwater MN 24-hr SO 100-yr 6 Rainfall=7.18" 5 Runoff Area=1.011 ac Runoff Volume=0.438 af 3 4 Runoff Depth>5.20" 3 Flow Length=430' er Tc=7.0 min 2 j CN=83 /// .i//1/ o , / ///.✓/////// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 37 Summary for Reach 5R: Existing Swale Inflow Area = 0.303 ac, 0.00% Impervious, Inflow Depth > 3.66" for 100-yr event Inflow = 1.39 cfs @ 12.10 hrs, Volume= 0.092 of Outflow = 1.39 cfs @ 12.10 hrs, Volume= 0.092 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 5R: Existing Swale Hydrograph / p Inflow 1 1.39 crs I r Outflow Inflow Area=0.3031 9,cfs t LL 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 38 Summary for Reach 6R: Existing Highway 5 Road Ditch Inflow Area = 1.196 ac, 0.00% Impervious, Inflow Depth > 3.66" for 100-yr event Inflow = 4.61 cfs @ 12.18 hrs, Volume= 0.364 af Outflow = 4.61 cfs @ 12.18 hrs, Volume= 0.364 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 6R: Existing Highway 5 Road Ditch Hydrograph ®Inflow 5 El Outflow Inflow Area=1 .196 04 101 a 3 it _o u 00, 2 / v 1 0;i� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe_text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 39 Summary for Reach 7R: Overland to Existing Memorial Ave. N Ditch Inflow Area = 1.106 ac, 44.67% Impervious, Inflow Depth > 5.06" for 100-yr event Inflow = 7.80 cfs @ 12.05 hrs, Volume= 0.467 af Outflow = 7.80 cfs @ 12.05 hrs, Volume= 0.467 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 7R: Overland to Existing Memorial Ave. N Ditch Hydrograph ■Inflow Kan D Outflow 8 Inflow Area=1 .106 7 .i„,.,.,,,,7 IF 6 1 7 5 0 4 LL 10- P 3 r 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Existing Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 40 Summary for Reach 8R: Flow To Existing Pond Inflow Area = 2.605 ac, 18.96% Impervious, Inflow Depth > 4.25" for 100-yr event Inflow = 12.06 cfs @ 12.07 hrs, Volume= 0.923 af Outflow = 12.06 cfs @ 12.07 hrs, Volume= 0.923 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 8R: Flow To Existing Pond Hydrograph ®Inflow 13 112.06cfs I D Outflow 12 Inflow Area=2.60516 11 {1 10 0 9 irr 0 7 u. 6 6; 4 3 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) (*-1--S) DA-1 2S 8P ce g---_____________\/ \\\ ( 4SI DA-2 Cu •e Sac Curb Cut / 9Pce DA-4 ®1— (-5S) 3s Southwes Curb Cut DA-5 / \ DA-3 Southwest Curb Cut /( 6S / ca 4„-- \DA-61 1A., 10 13R Southwest Curb Cut Existing Highway 5 Proposed Swale /�\ Road Ditch 14R ( 7SI Existing Swale DA-7 I 15R Flow To Existing Pond KSubcat Reach 'on• Link Routing Diagram for 18332 Proposed Conditions --N_____ Prepared by ISENGINEERS, Printed 1/25/2016 HydroCAD®10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC 18332 Proposed Conditions Prepared by ISENGINEERS Printed 1/25/2016 HydroCADO 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.691 69 50-75% Grass cover, Fair, HSG B (1S, 2S, 3S, 4S, 5S, 6S, 7S) 1.914 98 Paved parking, HSG B (1S, 2S, 4S, 5S, 6S) 2.605 90 TOTAL AREA 18332 Proposed Conditions Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.605 HSG B 1S, 2S, 3S, 4S, 5S, 6S, 7S 0.000 HSG C 0.000 HSG D 0.000 Other 2.605 TOTAL AREA 18332 Proposed Conditions Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD®10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.691 0.000 0.000 0.000 0.691 50-75% Grass cover, Fair 1S, 2S, 3S, 4S, 5S, 6S, 7S 0.000 1.914 0.000 0.000 0.000 1.914 Paved parking 1S, 2S, 4S, 5S, 6S 0.000 2.605 0.000 0.000 0.000 2.605 TOTAL AREA 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 5 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: DA-1 Runoff Area=1.011 ac 83.38% Impervious Runoff Depth>2.07" Flow Length=400' Tc=7.0 min CN=93 Runoff=3.43 cfs 0.174 af Subcatchment2S: DA-2 Runoff Area=0.391 ac 76.47% Impervious Runoff Depth>1.89" Flow Length=157' Tc=7.0 min CN=91 Runoff=1.23 cfs 0.062 af Subcatchment3S: DA-3 Runoff Area=0.148 ac 0.00% Impervious Runoff Depth>0.57" Tc=7.0 min CN=69 Runoff=0.11 cfs 0.007 af Subcatchment4S: DA-4 Runoff Area=0.054 ac 74.07% Impervious Runoff Depth>1.81" Tc=7.0 min CN=90 Runoff=0.16 cfs 0.008 af Subcatchment5S: DA-5 Runoff Area=0.388 ac 97.42% Impervious Runoff Depth>2.47" Tc=7.0 min CN=97 Runoff=1.49 cfs 0.080 af Subcatchment6S: DA-6 Runoff Area=0.362 ac 97.79% Impervious Runoff Depth>2.47" Tc=7.0 min CN=97 Runoff=1.39 cfs 0.074 af Subcatchment7S: DA-7 Runoff Area=0.251 ac 0.00% Impervious Runoff Depth>0.57" Tc=7.0 min CN=69 Runoff=0.18 cfs 0.012 af Reach 13R: Existing Highway 5 Road Ditch Inflow=1.33 cfs 0.069 af Outflow=1.33 cfs 0.069 af Reach 14R: Existing Swale Inflow=6.55 cfs 0.348 af Outflow=6.55 cfs 0.348 af Reach 15R: Flow To Existing Pond Inflow=7.87 cfs 0.417 af Outflow=7.87 cfs 0.417 af Pond 8P: Cul De Sac Curb Cut Peak Elev=938.29' Inflow=3.60 cfs 0.183 af Outflow=3.60 cfs 0.183 af Pond 9P: Southwest Curb Cut Peak Elev=937.69' Inflow=1.23 cfs 0.062 af Outflow=1.23 cfs 0.062 af Pond 10P: Southwest Curb Cut Peak Elev=937.38' Inflow=1.39 cfs 0.074 af Outflow=1.39 cfs 0.074 af Pond 11P: Southwest Curb Cut Peak Elev=937.17' Inflow=1.49 cfs 0.080 af Outflow=1.49 cfs 0.080 af Pond 12P: Proposed Swale Peak EIev=836.93' Storage=387 cf Inflow=6.65 cfs 0.349 af Outflow=6.55 cfs 0.348 af Total Runoff Area = 2.605 ac Runoff Volume = 0.417 af Average Runoff Depth = 1.92" 26.53% Pervious = 0.691 ac 73.47% Impervious = 1.914 ac 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1S: DA-1 Runoff = 3.43 cfs © 12.05 hrs, Volume= 0.174 af, Depth> 2.07" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.843 98 Paved parking, HSG B 0.168 69 50-75% Grass cover, Fair, HSG B 1.011 93 Weighted Average 0.168 16.62% Pervious Area 0.843 83.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.9 300 0.0070 1.70 Shallow Concentrated Flow, Paved Kv= 20.3 fps 4.3 400 Total, Increased to minimum Tc = 7.0 min Subcatchment 1S: DA-1 Hydrograph p Runoff 3.43 cfs J fe_text_mean - Stillwater 3 MN 24-hr SO 2-yr Rainfall=2.81" Runoff Area=1.011 ac4100 17- 2 Runoff Volume=0.174 of Runoff Depth>2.07" Flow Length=400' 1 Tc=7.0 min CN=93 j% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 2S: DA-2 Runoff = 1.23 cfs @ 12.05 hrs, Volume= 0.062 af, Depth> 1.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.299 98 Paved parking, HSG B 0.092 69 50-75% Grass cover, Fair, HSG B 0.391 91 Weighted Average 0.092 23.53% Pervious Area 0.299 76.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 40 0.0350 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 117 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 5.0 157 Total, Increased to minimum Tc= 7.0 min Subcatchment 2S: DA-2 Hydrograph 0 Runoff 1.23 cfs fe_text mean - Stillwater" MN 24-hr SO 2-yr 1 Rainfall=2.81" i Runoff Area=0.391 ac Runoff Volume=0.062 af u_ Runoff Depth>1.89" Flow Length=157' Tc=7.0 min CN 91 �f 0 :/-wiz . ' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 3S: DA-3 Runoff = 0.11 cfs @ 12.07 hrs, Volume= 0.007 af, Depth> 0.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.148 69 50-75% Grass cover, Fair, HSG B 0.148 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: DA-3 Hydrograph 0.12./ 0.115 ❑Runoff 0.11 Io.mmcfs 0.105 fe_text_mean - Stillwater 0.1 0.095 MN 24-hr SO 2-yr 0.09 Rainfall=2.81" 0.085 0.08 0.075 Runoff Area=0.148 ac 30065 Runoff Volume=0.007 af 00055 Runoff Depth>0.57" LL 0.045 Tc=7.0 min 0.0 0035 CN=690.03 P% 0.025 0.02 / /. 0.015 0.01 ��4//!'0#'/ I' 0.000 ,//✓✓/�/////ssir/.. Ze.e.e/itereerofe s/.///.////.!i'%./'/if./I� 1././!!/.�'s�/ '/✓/.'ar/'�! / /'// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 4S: DA-4 Runoff = 0.16 cfs @ 12.05 hrs, Volume= 0.008 af, Depth> 1.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.040 98 Paved parking, HSG B 0.014 69 50-75% Grass cover, Fair, HSG B 0.054 90 Weighted Average 0.014 25.93% Pervious Area 0.040 74.07% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 4S: DA-4 Hydrograph 0.18 Runoff 0.17 )o.t6cfs 0.16 fe text mean - Stillwater OA 0.15 01 MN 24-hr SO 2-yr 0.13 Rainfall=2.81" 00 0.12 10 Runoff Area=0.054 ac I 0.11 0.1 Runoff Volume=0.008 of11 009 2 °°$ Runoff Depth>1.81" 0.07 Tc=7.0 min r 0 06 0 05 CN=90 % 004 002 0.01 /At/ /��ff/�ii�/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Pane 10 Summary for Subcatchment 5S: DA-5 Runoff = 1.49 cfs @ 12.05 hrs, Volume= 0.080 af, Depth> 2.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.378 98 Paved parking, HSG B 0.010 69 50-75% Grass cover, Fair, HSG B 0.388 97 Weighted Average 0.010 2.58% Pervious Area 0.378 97.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: DA-5 Hydrograph 0 Runoff 1149 cfs fe_text_mean - Stillwater 0 MN 24-hr SO 2-yr Rainfall=2.81" VA Runoff Area=0.388 ac 1 Runoff Volume=0.080 of Runoff Depth>2.47" LL Tc=7.0 min CN=97 .00,02 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment 6S: DA-6 Runoff = 1.39 cfs @ 12.05 hrs, Volume= 0.074 af, Depth> 2.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.354 98 Paved parking, HSG B 0.008 69 50-75% Grass cover, Fair, HSG B 0.362 97 Weighted Average 0.008 2.21% Pervious Area 0.354 97.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: DA-6 Hydrograph 0 Runoff I 1.39 cfs fe_text_mean - Stillwater if . MN 24-hr SO 2-yr Rainfall=2.81" 1000 1 Runoff Area=0.362 ac Runoff Volume=0.074 af `` Runoff Depth>2.47" LL Tc=7.0 min CN=97 j p ///////,„., , /lJ/J/!f//////l /•f✓Jfif/fJ/J//./!J/!J/J//f//i'////f 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 7S: DA-7 Runoff = 0.18 cfs @ 12.07 hrs, Volume= 0.012 af, Depth> 0.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Area (ac) CN Description 0.251 69 50-75% Grass cover, Fair, HSG B 0.251 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: DA-7 Hydrograph 0.2p Runoff 0.19 i 0.18 crs i 0.18 fe_text_mean - Stillwater 0.16 MN 24-hr SO 2-yr 0.15 Rainfall=2.81" 0.13 Runoff Area=0.251 ac 0.11 Runoff Volume=0.012 af LL .09 o.1 Runoff Depth>0.57" 008Tc=7.0 min 0.07 0.06 CN=69 0.05 0.04- 0.03 0.02. *� 0.01 -/`/ 61#1~i~//i�.��iW.ee.�i�//Irf/l/t�I',/di 0 /Z.g.///0/./sri//.//sfa'fa.'i.,00//t/..,/,/I.e//./// ,55!1/'/r/�/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 13 Summary for Reach 13R: Existing Highway 5 Road Ditch Inflow Area = 0.539 ac, 55.47% Impervious, Inflow Depth > 1.53" for 2-yr event Inflow = 1.33 cfs @ 12.05 hrs, Volume= 0.069 af Outflow = 1.33 cfs @ 12.05 hrs, Volume= 0.069 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 13R: Existing Highway 5 Road Ditch Hydrograph / ®Inflow 1 1.33 cfs I �Outflow Inflow Area=0.539'143 1 +ry pfr V13 o //J.fl./`rr'/..�yf r�s.%��! �"',s1�%;i7,4� % 1:444 °� 1/ . �rl� r .///dsi/s`/llf� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 14 Summary for Reach 14R: Existing Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 2.02" for 2-yr event Inflow = 6.55 cfs @ 12.06 hrs, Volume= 0.348 af Outflow = 6.55 cfs @ 12.06 hrs, Volume= 0.348 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 14R: Existing Swale Hydrograph ®Inflow 7 0 Outflow Inflow Area=2.066 6 PFA 5 I00; v 4 1010.1' 3 2 ��.. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 15 Summary for Reach 15R: Flow To Existing Pond Inflow Area = 2.605 ac, 73.47% Impervious, Inflow Depth > 1.92" for 2-yr event Inflow = 7.87 cfs @ 12.06 hrs, Volume= 0.417 af Outflow = 7.87 cfs @ 12.06 hrs, Volume= 0.417 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 15R: Flow To Existing Pond Hydrograph / ■Inflow 17.87 cfs I 0 Outflow 8 Inflow Area=2.6051afs 7 6 T2 5 /' u. 4 3 2 ///� / '�/L// Ar /l!///////////l///////////////////// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 16 Summary for Pond 8P: Cul De Sac Curb Cut Inflow Area = 1.065 ac, 82.91% Impervious, Inflow Depth > 2.06" for 2-yr event Inflow = 3.60 cfs @ 12.05 hrs, Volume= 0.183 af Outflow = 3.60 cfs @ 12.05 hrs, Volume= 0.183 af, Atten= 0%, Lag= 0.0 min Primary = 3.60 cfs @ 12.05 hrs, Volume= 0.183 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 938.29'@ 12.05 hrs Flood Elev= 938.41' Device Routing Invert Outlet Devices #1 Primary 937.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 0.70 Width (feet) 4.00 12.00 20.00 Primary OutFlow Max=3.60 cfs @ 12.05 hrs HW=938.29' TW=836.92' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 3.60 cfs @ 1.71 fps) Pond 8P: Cul De Sac Curb Cut Hydrograph 4 ®Inflow I 3.60 ors I 0 Primary Inflow Area=1 .065136 °h Peak EIev=938.29' ris 3 0 1 04 210; LL j 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 17 Summary for Pond 9P: Southwest Curb Cut Inflow Area = 0.391 ac, 76.47% Impervious, Inflow Depth > 1.89" for 2-yr event Inflow = 1.23 cfs @ 12.05 hrs, Volume= 0.062 af Outflow = 1.23 cfs @ 12.05 hrs, Volume= 0.062 af, Atten= 0%, Lag= 0.0 min Primary = 1.23 cfs @ 12.05 hrs, Volume= 0.062 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.69'@ 12.05 hrs Flood Elev= 937.94' Device Routing Invert Outlet Devices #1 Primary 937.52' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=1.22 cfs @ 12.05 hrs HW=937.69' TW=0.00' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 1.22 cfs @ 1.30 fps) Pond 9P: Southwest Curb Cut Hydrograph ■Inflow ® El Primary Inflow Area=0.391 ® Peak Elev=937.69' '0 LL f/ 0ter' , 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 18 Summary for Pond 10P: Southwest Curb Cut Inflow Area = 0.362 ac, 97.79% Impervious, Inflow Depth > 2.47" for 2-yr event Inflow = 1.39 cfs @ 12.05 hrs, Volume= 0.074 af Outflow = 1.39 cfs @ 12.05 hrs, Volume= 0.074 af, Atten= 0%, Lag= 0.0 min Primary = 1.39 cfs @ 12.05 hrs, Volume= 0.074 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.38'@ 12.05 hrs Flood Elev= 937.66' Device Routing Invert Outlet Devices #1 Primary 937.19' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=1.39 cfs @ 12.05 hrs HW=937.38' TW=836.92' (Dynamic Tailwater) 4-1=Custom Weir/Orifice (Weir Controls 1.39 cfs @ 1.34 fps) Pond 10P: Southwest Curb Cut Hydrograph ®Inflow 0 Primary Inflow Area=0.362: Peak Elev=937.38' / /r 10 `/LL %j 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 19 Summary for Pond 11P: Southwest Curb Cut Inflow Area = 0.388 ac, 97.42% Impervious, Inflow Depth > 2.47" for 2-yr event Inflow = 1.49 cfs @ 12.05 hrs, Volume= 0.080 af Outflow = 1.49 cfs @ 12.05 hrs, Volume= 0.080 af, Atten= 0%, Lag= 0.0 min Primary = 1.49 cfs @ 12.05 hrs, Volume= 0.080 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.17'@ 12.05 hrs Flood Elev= 937.41' Device Routing Invert Outlet Devices #1 Primary 936.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=1.49 cfs @ 12.05 hrs HW=937.17' TW=836.92' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 1.49 cfs @ 1.37 fps) Pond 11P: Southwest Curb Cut Hydrograph / ■Inflow 1 1.a9 cts I B Primary Inflow Area=0.3881':49 Peak EIev=937.17' o �,� � ;,oma �., o o //r.. '/..+'.. ;'li//f !/f/l///,/l/J/.s./h/l/I/ls//�//�!/////f/.//// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 20 Summary for Pond 12P: Proposed Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 2.03" for 2-yr event Inflow = 6.65 cfs @ 12.05 hrs, Volume= 0.349 af Outflow = 6.55 cfs @ 12.06 hrs, Volume= 0.348 af, Atten= 2%, Lag= 0.7 min Primary = 6.55 cfs @ 12.06 hrs, Volume= 0.348 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 836.93'@ 12.06 hrs Surf.Area= 1,432 sf Storage= 387 cf Flood Elev= 837.10' Surf.Area= 2,677 sf Storage= 717 cf Plug-Flow detention time=2.1 min calculated for 0.348 of(100% of inflow) Center-of-Mass det. time= 1.6 min ( 780.8 - 779.2 ) Volume Invert Avail.Storage Storage Description #1 836.42' 7,365 cf Custom Stage Data (Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 836.42 100 0 0 837.00 1,630 502 502 838.00 12,097 6,864 7,365 Device Routing Invert Outlet Devices #1 Primary 836.42' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.58 1.58 Width (feet) 0.00 16.00 35.00 Primary OutFlow Max=6.54 cfs @ 12.06 hrs HW=836.92' TW=0.00' (Dynamic Tailwater) 4-1=Custom Weir/Orifice (Weir Controls 6.54 cfs @ 1.86 fps) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 2-yr Rainfall=2.81" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 21 Pond 12P: Proposed Swale Hydrograph / p Inflow I6.65cn( ❑Primary 7 Inflow Area=2.066 �f 6 Peak Elev=836.93 10) Storage=387 cf 5 a 4 3 2 4-04 P. j ' o / !/ / //// ///0////////z// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 22 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: DA-1 Runoff Area=1.011 ac 83.38% Impervious Runoff Depth>3.38" Flow Length=400' Tc=7.0 min CN=93 Runoff=5.42 cfs 0.285 af Subcatchment2S: DA-2 Runoff Area=0.391 ac 76.47% Impervious Runoff Depth>3.18" Flow Length=157' Tc=7.0 min CN=91 Runoff=2.00 cfs 0.104 af Subcatchment3S: DA-3 Runoff Area=0.148 ac 0.00% Impervious Runoff Depth>1.38" Tc=7.0 min CN=69 Runoff=0.31 cfs 0.017 af Subcatchment4S: DA-4 Runoff Area=0.054 ac 74.07% Impervious Runoff Depth>3.08" Tc=7.0 min CN=90 Runoff=0.27 cfs 0.014 af Subcatchment5S: DA-5 Runoff Area=0.388 ac 97.42% Impervious Runoff Depth>3.82" Tc=7.0 min CN=97 Runoff=2.23 cfs 0.123 af Subcatchment6S: DA-6 Runoff Area=0.362 ac 97.79% Impervious Runoff Depth>3.82" Tc=7.0 min CN=97 Runoff=2.08 cfs 0.115 af Subcatchment7S: DA-7 Runoff Area=0.251 ac 0.00% Impervious Runoff Depth>1.38" Tc=7.0 min CN=69 Runoff=0.52 cfs 0.029 af Reach 13R: Existing Highway 5 Road Ditch Inflow=2.30 cfs 0.121 af Outflow=2.30 cfs 0.121 af Reach 14R: Existing Swale Inflow=10.37 cfs 0.566 af Outflow=10.37 cfs 0.566 af Reach 15R: Flow To Existing Pond Inflow=12.65 cfs 0.687 af Outflow=12.65 cfs 0.687 af Pond 8P: Cul De Sac Curb Cut Peak Elev=938.38' Inflow=5.69 cfs 0.299 af Outflow=5.69 cfs 0.299 af Pond 9P: Southwest Curb Cut Peak Elev=937.75' Inflow=2.00 cfs 0.104 af Outflow=2.00 cfs 0.104 af Pond 10P: Southwest Curb Cut Peak Elev=937.43' Inflow=2.08 cfs 0.115 af Outflow=2.08 cfs 0.115 af Pond 11P: Southwest Curb Cut Peak Elev=937.22' Inflow=2.23 cfs 0.123 af Outflow=2.23 cfs 0.123 af Pond 12P: Proposed Swale Peak EIev=837.03' Storage=549 cf Inflow=10.52 cfs 0.566 af Outflow=10.37 cfs 0.566 af Total Runoff Area = 2.605 ac Runoff Volume = 0.687 af Average Runoff Depth = 3.16" 26.53% Pervious = 0.691 ac 73.47% Impervious = 1.914 ac 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 sin 02403 ©2014 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 1S: DA-1 Runoff = 5.42 cfs @ 12.05 hrs, Volume= 0.285 af, Depth> 3.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.843 98 Paved parking, HSG B 0.168 69 50-75% Grass cover, Fair, HSG B 1.011 93 Weighted Average 0.168 16.62% Pervious Area 0.843 83.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.9 300 0.0070 1.70 Shallow Concentrated Flow, Paved Kv= 20.3 fps 4.3 400 Total, Increased to minimum Tc = 7.0 min Subcatchment 1S: DA-1 Hydrograph 6 0 Runoff 5.42 cfs J fe_text_mean - Stillwater 5 MN 24-hr SO 10-yr 10 Rainfall=4.17" 10 4 Runoff Area=1.011 ac Runoff Volume=0.285 af 3 Runoff Depth>3.38" f/ LL Flow Length=400' • 2 Tc=7.0 min ,04 1CN=93 ;1/AO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 2S: DA-2 Runoff = 2.00 cfs @ 12.05 hrs, Volume= 0.104 af, Depth> 3.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.299 98 Paved parking, HSG B 0.092 69 50-75% Grass cover, Fair, HSG B 0.391 91 Weighted Average 0.092 23.53% Pervious Area 0.299 76.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 40 0.0350 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 117 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 5.0 157 Total, Increased to minimum Tc = 7.0 min Subcatchment 2S: DA-2 Hydrograph In Runoff 2.00 cfs 2 fe_textmean - Stillwater MN 24-hr SO 10-yr Rainfall=4.17" Runoff Area=0.391 ac lot Runoff Volume=0.104 af LL 1 Runoff Depth>3.18" Flow Length=157' r. Tc=7.0 min CN=91 f offsfar!/!/!/!./!//!/!///!/!/!/!/!///`/!///! l�f!/!/!!/!//f/!/!/!/!////!.o'!/!e'!of/!// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 3S: DA-3 Runoff = 0.31 cfs @ 12.06 hrs, Volume= 0.017 af, Depth> 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.148 69 50-75% Grass cover, Fair, HSG B 0.148 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: DA-3 Hydrograph 0.34 / ❑Runoff 0.32 10.31 cfs l 0.3 fe_text_mean - Stillwater 0.28 MN 24-hr SO 10-yr 0.26 Rainfall=4.17" 0.24 0.22 Runoff Area=0.148 ac 0.2 Runoff Volume=0.017 af 0.18 O 0.16 Runoff Depth>1.38" LL 014 Tc=7.0 min °12 0.1 CN=69 00 j 0.06 /� 0 04 0.02 'zez // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD© 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment 4S: DA-4 Runoff = 0.27 cfs @ 12.05 hrs, Volume= 0.014 af, Depth> 3.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.040 98 Paved parking, HSG B 0.014 69 50-75% Grass cover, Fair, HSG B 0.054 90 Weighted Average 0.014 25.93% Pervious Area 0.040 74.07% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 4S: DA-4 Hydrograph 0.3 0 Runoff 0.28 l 0.27 cfs 0.26 fe_text_mean - Stillwater 0.24 MN 24-hr SO 10-yr 0.22 Rainfall=4.17" 02 Runoff Area=0.054 ac 0.18 Runoff Volume=0.014 af 0.14 Runoff Depth>3.08" LL 0.12 Tc=7.0 min 0.1 CN=90 0.08 0 06 0.04 a4O 0.02 �� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment 5S: DA-5 Runoff = 2.23 cfs @ 12.05 hrs, Volume= 0.123 af, Depth> 3.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.378 98 Paved parking, HSG B 0.010 69 50-75% Grass cover, Fair, HSG B 0.388 97 Weighted Average 0.010 2.58% Pervious Area 0.378 97.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: DA-5 Hydrograph / ❑Runoff 2.23 cfs I fe text mean - Stillwater 0 2 MN 24-hr SO 10-yr I Rainfall=4.17" �� Runoff Area=0.388 ac Runoff Volume=0.123 af 000 Runoff Depth>3.82" LL 1 Tc=7.0 min CN=97 %/ 0.5 Wee, ��/! o / 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment 6S: DA-6 Runoff = 2.08 cfs @ 12.05 hrs, Volume= 0.115 af, Depth> 3.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.354 98 Paved parking, HSG B 0.008 69 50-75% Grass cover, Fair, HSG B 0.362 97 Weighted Average 0.008 2.21% Pervious Area 0.354 97.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: DA-6 Hydrograph D Runoff 12.08 ors 2 fe_text_mean - Stillwater di MN 24-hr SO 10-yr Rainfall=4.17" Runoff Area=0.362 ac Runoff Volume=0.115 of Runoff Depth>3.82" f LL 1Or Tc=7.0 min jj CN=97 j 4eez. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 29 Summary for Subcatchment 7S: DA-7 Runoff = 0.52 cfs @ 12.06 hrs, Volume= 0.029 af, Depth> 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Area (ac) CN Description 0.251 69 50-75% Grass cover, Fair, HSG B 0.251 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: DA-7 Hydrograph El Runoff 0.55 1 0.52 cfs 1 0.5 fe_text_mean - Stillwater `' 0.45 MN 24-hr SO 10-yr Rainfall=4.17" froo 0.4 Runoff Area=0.251 ac 0.35 Runoff Volume=0.029 af 0.3 0 Runoff Depth>1.38" U 0.25 Tc=7.0 min 0.2 CN=69 004 0.15 effej 0.05 / 111.1fir"'frdrd rreA174fs'f7i�i�'®I�.`i�5l%,1%.40i�i0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 30 Summary for Reach 13R: Existing Highway 5 Road Ditch Inflow Area = 0.539 ac, 55.47% Impervious, Inflow Depth > 2.68" for 10-yr event Inflow = 2.30 cfs @ 12.05 hrs, Volume= 0.121 af Outflow = 2.30 cfs @ 12.05 hrs, Volume= 0.121 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 13R: Existing Highway 5 Road Ditch Hydrograph ®Inflow 12.30.cfs I D Outflow Inflow Area=0.53912a.°� 2 V O a 1 o : f///omez/,Are//.f�fi/✓`;�v " 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 31 Summary for Reach 14R: Existing Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 3.29" for 10-yr event Inflow = 10.37 cfs @ 12.06 hrs, Volume= 0.566 af Outflow = 10.37 cfs @ 12.06 hrs, Volume= 0.566 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 14R: Existing Swale Hydrograph / ®Inflow 11 I 10 37 cfs I 0 Outflow Inflow Area=2.o66'a'cfs 10 r 9 A 8 7 6 �1.0 U.2 5 I� t. �4 3 /40 2 1 f 1 0 , r'7.14. 45;0?- 044,'/ #fo 'a,en/% /40.0..%/.747.00 ,0/3, 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 32 Summary for Reach 15R: Flow To Existing Pond Inflow Area = 2.605 ac, 73.47% Impervious, Inflow Depth > 3.16" for 10-yr event Inflow = 12.65 cfs @ 12.06 hrs, Volume= 0.687 af Outflow = 12.65 cfs @ 12.06 hrs, Volume= 0.687 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 15R: Flow To Existing Pond Hydrograph II14 / Inflow 112.65 cfs( 0 Outflow 13 Inflow Area=2.6O515 12 11 d� 10 9 I%�� 7 LL 6 /� 5 /ir,/` 044 3 2 % E 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 33 Summary for Pond 8P: Cul De Sac Curb Cut Inflow Area = 1.065 ac, 82.91% Impervious, Inflow Depth > 3.37" for 10-yr event Inflow = 5.69 cfs @ 12.05 hrs, Volume= 0.299 af Outflow = 5.69 cfs @ 12.05 hrs, Volume= 0.299 af, Atten= 0%, Lag= 0.0 min Primary = 5.69 cfs @ 12.05 hrs, Volume= 0.299 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 938.38'@ 12.05 hrs Flood Elev= 938.41' Device Routing Invert Outlet Devices #1 Primary 937.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 0.70 Width (feet) 4.00 12.00 20.00 Primary OutFlow Max=5.68 cfs @ 12.05 hrs HW=938.38' TW=837.02' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 5.68 cfs @ 1.91 fps) Pond 8P: Cul De Sac Curb Cut Hydrograph / ■Inflow Earl a Primary 6 Inflow Area=1 .065 19201,- 5 Peak Elev=938.38' y/ 4 3 3 I Pi 2 fj M°� �� �.,�a -'��":��'`���If%%fI%%%%%%moi%%%�%%%�1�./f/it re�`//./ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 34 Summary for Pond 9P: Southwest Curb Cut Inflow Area = 0.391 ac, 76.47% Impervious, Inflow Depth > 3.18" for 10-yr event Inflow = 2.00 cfs @ 12.05 hrs, Volume= 0.104 af Outflow = 2.00 cfs @ 12.05 hrs, Volume= 0.104 af, Atten= 0%, Lag= 0.0 min Primary = 2.00 cfs @ 12.05 hrs, Volume= 0.104 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.75'@ 12.05 hrs Flood Elev= 937.94' Device Routing Invert Outlet Devices #1 Primary 937.52' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=2.00 cfs @ 12.05 hrs HW=937.75' TW=0.00' (Dynamic Tailwater) 4r-1=Custom Weir/Orifice (Weir Controls 2.00 cfs @ 1.48 fps) Pond 9P: Southwest Curb Cut Hydrograph LI Inflow 12.00 cfs I 0 Primary 2 Inflow Area=0.39112-° 41;- Peak Elev=937.75' A r 1004 vr - "00.„7- -5.7.0,-,werez/-.0rioretv/7/7-..,(077./r/y/0„ 0 4,-„:„7/// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 35 Summary for Pond 10P: Southwest Curb Cut Inflow Area = 0.362 ac, 97.79% Impervious, Inflow Depth > 3.82" for 10-yr event Inflow = 2.08 cfs @ 12.05 hrs, Volume= 0.115 of Outflow = 2.08 cfs @ 12.05 hrs, Volume= 0.115 af, Atten= 0%, Lag= 0.0 min Primary = 2.08 cfs @ 12.05 hrs, Volume= 0.115 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.43'@ 12.05 hrs Flood Elev= 937.66' Device Routing Invert Outlet Devices #1 Primary 937.19' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=2.08 cfs @ 12.05 hrs HW=937.43' TW=837.02' (Dynamic Tailwater) 1-1=Custom Weir/Orifice (Weir Controls 2.08 cfs @ 1.49 fps) Pond 10P: Southwest Curb Cut Hydrograph / ®Inflow 2.08 cry I 0 Primary Inflow Area=0.36212:08 2 Peak Elev=937.43' le:✓ .® F","''� r "r,,+/,I/,P� °'. /, ' . WOW ,t ,e/ ....= . r,... .. . 0 ', y 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 36 Summary for Pond 11P: Southwest Curb Cut Inflow Area = 0.388 ac, 97.42% Impervious, Inflow Depth > 3.82" for 10-yr event Inflow = 2.23 cfs @ 12.05 hrs, Volume= 0.123 af Outflow = 2.23 cfs @ 12.05 hrs, Volume= 0.123 af, Atten= 0%, Lag= 0.0 min Primary = 2.23 cfs @ 12.05 hrs, Volume= 0.123 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.22'@ 12.05 hrs Flood Elev= 937.41' Device Routing Invert Outlet Devices #1 Primary 936.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary Outflow Max=2.23 cfs @ 12.05 hrs HW=937.22' TW=837.02' (Dynamic Tailwater) t1=Custom Weir/Orifice (Weir Controls 2.23 cfs @ 1.52 fps) Pond 11P: Southwest Curb Cut Hydrograph Inflow 2.23 cfs I 0 Primary Inflow Area=0.38812.23c,5 2 Peak Elev=937.22' i` LL � • ' " '' ,._. o / %1,11:/, I7771 //f//4*7"- /":4W-1.97 01 't 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 37 Summary for Pond 12P: Proposed Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 3.29" for 10-yr event Inflow = 10.52 cfs @ 12.05 hrs, Volume= 0.566 af Outflow = 10.37 cfs @ 12.06 hrs, Volume= 0.566 af, Atten= 1%, Lag= 0.7 min Primary = 10.37 cfs @ 12.06 hrs, Volume= 0.566 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 837.03'@ 12.06 hrs Surf.Area= 1,911 sf Storage= 549 cf Flood Elev= 837.10' Surf.Area= 2,677 sf Storage= 717 cf Plug-Flow detention time= 1.8 min calculated for 0.566 af(100% of inflow) Center-of-Mass det. time= 1.5 min ( 766.9 - 765.4 ) Volume Invert Avail.Storage Storage Description #1 836.42' 7,365 cf Custom Stage Data (Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 836.42 100 0 0 837.00 1,630 502 502 838.00 12,097 6,864 7,365 Device Routing Invert Outlet Devices #1 Primary 836.42' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.58 1.58 Width (feet) 0.00 16.00 35.00 Primary OutFlow Max=10.36 cfs @ 12.06 hrs HW=837.03' TW=0.00' (Dynamic Tailwater) 4-1=Custom Weir/Orifice (Weir Controls 10.36 cfs @ 2.04 fps) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 10-yr Rainfall=4.17" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 38 Pond 12P: Proposed Swale Hydrograph / ®Inflow Egiiin 0 Primary 11 Inflow Area=2.066 10 Peak EIev=837.03' 0,1 / ` 9 8 Storage=549 cf i� IVA7 OF0 in 3 6 LL 5oz 0004 ,93 2 f`� 0 //..X,71sr/'`./s7. 0'Y, v./-/7/",,,,.1/......4.�Ifli r/r d /d s. a 's /` .'4':',. .,',;-0.,;c7. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 39 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: DA-1 Runoff Area=1.011 ac 83.38% Impervious Runoff Depth>4.42" Flow Length=400' Tc=7.0 min CN=93 Runoff=6.72 cfs 0.373 af Subcatchment2S: DA-2 Runoff Area=0.391 ac 76.47% Impervious Runoff Depth>4.20" Flow Length=157' Tc=7.0 min CN=91 Runoff=2.51 cfs 0.137 af Subcatchment3S: DA-3 Runoff Area=0.148 ac 0.00% Impervious Runoff Depth>2.12" Tc=7.0 min CN=69 Runoff=0.48 cfs 0.026 of Subcatchment4S: DA-4 Runoff Area=0.054 ac 74.07% Impervious Runoff Depth>4.10" Tc=7.0 min CN=90 Runoff=0.34 cfs 0.018 af Subcatchment5S: DA-5 Runoff Area=0.388 ac 97.42% Impervious Runoff Depth>4.87" Tc=7.0 min CN=97 Runoff=2.71 cfs 0.158 af Subcatchment6S: DA-6 Runoff Area=0.362 ac 97.79% Impervious Runoff Depth>4.87" Tc=7.0 min CN=97 Runoff=2.53 cfs 0.147 of Subcatchment7S: DA-7 Runoff Area=0.251 ac 0.00% Impervious Runoff Depth>2.12" Tc=7.0 min CN=69 Runoff=0.81 cfs 0.044 af Reach 13R: Existing Highway 5 Road Ditch Inflow=2.99 cfs 0.163 of Outflow=2.99 cfs 0.163 of Reach 14R: Existing Swale Inflow=12.87 cfs 0.740 af Outflow=12.87 cfs 0.740 af Reach 15R: Flow To Existing Pond Inflow=15.83 cfs 0.903 of Outflow=15.83 cfs 0.903 of Pond 8P: Cul De Sac Curb Cut Peak EIev=938.43' Inflow=7.06 cfs 0.391 of Outflow=7.06 cfs 0.391 af Pond 9P: Southwest Curb Cut Peak EIev=937.78' Inflow=2.51 cfs 0.137 af Outflow=2.51 cfs 0.137 of Pond 10P: Southwest Curb Cut Peak Elev=937.45' Inflow=2.53 cfs 0.147 of Outflow=2.53 cfs 0.147 of Pond 11P: Southwest Curb Cut Peak Elev=937.24' Inflow=2.71 cfs 0.158 af Outflow=2.71 cfs 0.158 of Pond 12P: Proposed Swale Peak EIev=837.08' Storage=671 cf Inflow=13.11 cfs 0.740 af Outflow=12.87 cfs 0.740 of Total Runoff Area = 2.605 ac Runoff Volume = 0.903 af Average Runoff Depth = 4.16" 26.53% Pervious = 0.691 ac 73.47% Impervious = 1.914 ac 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 40 Summary for Subcatchment 1S: DA-1 Runoff = 6.72 cfs @ 12.05 hrs, Volume= 0.373 af, Depth> 4.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.843 98 Paved parking, HSG B 0.168 69 50-75% Grass cover, Fair, HSG B 1.011 93 Weighted Average 0.168 16.62% Pervious Area 0.843 83.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.9 300 0.0070 1.70 Shallow Concentrated Flow, Paved Kv= 20.3 fps 4.3 400 Total, Increased to minimum Tc = 7.0 min Subcatchment 1S: DA-1 Hydrograph 7 0 Runoff 7 16 72 cfS fe text mean - Stillwate 6 MN 24-hr SO 25-yr Rainfall=5.23" 5 Runoff Area=1.011 ac 4 Runoff Volume=0.373 af Runoff Depth>4.42" 3 Flow Length=400' • 2 Tc=7.0 min CN=93 k; o !//G/!!!!//// /I/�/,/!/1!`!!/!!!!!!!/!!! 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD© 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 41 Summary for Subcatchment 2S: DA-2 Runoff = 2.51 cfs @ 12.05 hrs, Volume= 0.137 af, Depth> 4.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.299 98 Paved parking, HSG B 0.092 69 50-75% Grass cover, Fair, HSG B 0.391 91 Weighted Average 0.092 23.53% Pervious Area 0.299 76.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 40 0.0350 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 117 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 5.0 157 Total, Increased to minimum Tc = 7.0 min Subcatchment 2S: DA-2 Hydrograph 0 Runoff 12.51 cfs fe_text mean - Stillwater j MN 24-hr SO 25-yr 2 Rainfall=5.23" Runoff Area=0.391 ac Runoff Volume=0.137 af Runoff Depth>4.20" 1 Flow Length=157' Tc=7.0 min CN=91 $0` 01/. './/le mez,.✓.:"l..f/,�°,,�/sa/ /l/�%'' !/!//I//!/!!�!f/o'/s'fsff!//e///! 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Pacie 42 Summary for Subcatchment 3S: DA-3 Runoff = 0.48 cfs @ 12.06 hrs, Volume= 0.026 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.148 69 50-75% Grass cover, Fair, HSG B 0.148 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: DA-3 Hydrograph Runoff 0.5 I 0.48 ors fe text mean - Stillwater 0.45 — — MN 24-hr SO 25-yr 04 Rainfall=5.23" ► 0.35 Runoff Area=0.148 ac w 0.3 Runoff Volume=0.026 af 0.25 Runoff Depth>2.12" , 0.2 Tc=7.0 min 0.15 CN=69 05$ 0.1 0.05 • 0 Of- W...4"Mrerd rieer/ 65507.474 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 43 Summary for Subcatchment 4S: DA-4 Runoff = 0.34 cfs @ 12.05 hrs, Volume= 0.018 af, Depth> 4.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.040 98 Paved parking, HSG B 0.014 69 50-75% Grass cover, Fair, HSG B 0.054 90 Weighted Average 0.014 25.93% Pervious Area 0.040 74.07% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 4S: DA-4 Hydrograph 0.38./ 0 Runoff 0.36 1034 cfs 0.34 fe text mean - Stillwater ' 0.32 0.3 MN 24-hr SO 25-yr 0.28 Rainfall=5.23" 0.26 0.24 Runoff Area=0.054 ac 3 °02 Runoff Volume=0.018 of 0 0.18 Runoff Depth>4.10 u. 0.16 0.14 Tc=7.0 min °0.� CN=90 0.08 0.06 0.04 J0., di":���� f"7.47�1���������� 0.02 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 44 Summary for Subcatchment 5S: DA-5 Runoff = 2.71 cfs @ 12.05 hrs, Volume= 0.158 af, Depth> 4.87" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.378 98 Paved parking, HSG B 0.010 69 50-75% Grass cover, Fair, HSG B 0.388 97 Weighted Average 0.010 2.58% Pervious Area 0.378 97.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: DA-5 Hydrograph V 3 ❑Runoff 12.7,cfs j fe_text_mean - Stillwater MN 24-hr SO 25-yr I'd 2 Rainfall=5.23" 1� Runoff Area=0.388 ac 10 Runoff Volume=0.158 af Runoff Depth>4.87" LL Tc=7.0 min •/ 1 CN=97 ,�'�% %` AiL 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 45 Summary for Subcatchment 6S: DA-6 Runoff = 2.53 cfs @ 12.05 hrs, Volume= 0.147 af, Depth> 4.87" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.354 98 Paved parking, HSG B 0.008 69 50-75% Grass cover, Fair, HSG B 0.362 97 Weighted Average 0.008 2.21% Pervious Area 0.354 97.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: DA-6 Hydrograph / D Runoff 12.53 cfs fe text mean - Stillwater id MN 24-hr SO 25-yr OA 2 Rainfall=5.23" Runoff Area=0.362 ac 16-0 Runoff Volume=0.147 af 16 Runoff Depth>4.87" 0 LL Tc=7.0 min 0. 1 CN=97 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 46 Summary for Subcatchment 7S: DA-7 Runoff = 0.81 cfs @ 12.06 hrs, Volume= 0.044 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Area (ac) CN Description 0.251 69 50-75% Grass cover, Fair, HSG B 0.251 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: DA-7 Hydrograph 0.9 Runoff 0.85 10.81 cfs 0.8 fe_text_mean - Stillwater 075 MN 24-hr SO 25-yr 4 0.7 0.65 Rainfall=5.23" i 06 Runoff Area=0.251 ac �V 0.55 0.5 Runoff Volume=0.044 af 045 Runoff Depth>2.12" u. 0.4 0.35 Tc=7.0 min 00 0.3.25 CN=69 002 .15 °0.1 4 0.00 ,.1,��.�I//i/��. •0 /"..e". /�//�����I%l�//�.�/' .01,40 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 47 Summary for Reach 13R: Existing Highway 5 Road Ditch Inflow Area = 0.539 ac, 55.47% Impervious, Inflow Depth > 3.63" for 25-yr event Inflow = 2.99 cfs @ 12.05 hrs, Volume= 0.163 af Outflow = 2.99 cfs @ 12.05 hrs, Volume= 0.163 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 13R: Existing Highway 5 Road Ditch Hydrograph / ®Inflow 12.99,cfs I B Outflow 3Inflow Area=0.53916 cfs 2 !i LL rs. t 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 48 Summary for Reach 14R: Existing Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 4.30" for 25-yr event Inflow = 12.87 cfs @ 12.06 hrs, Volume= 0.740 af Outflow = 12.87 cfs @ 12.06 hrs, Volume= 0.740 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 14R: Existing Swale Hydrograph / ■Inflow 14 112.8?cfs I 0 Outflow 13 Inflow Area=2.O661687°is 12 F 11 Arr 10 Pir 9 8 3 7 LT. 6 0 0z,5 4 -/ 4,032 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 49 Summary for Reach 15R: Flow To Existing Pond Inflow Area = 2.605 ac, 73.47% Impervious, Inflow Depth > 4.16" for 25-yr event Inflow = 15.83 cfs @ 12.06 hrs, Volume= 0.903 af Outflow = 15.83 cfs @ 12.06 hrs, Volume= 0.903 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 15R: Flow To Existing Pond Hydrograph / M Inflow 17 115.83 cfs I 0 Outflow 16 Inflow Area=2.605 '583fs 15 0. '�* 14 13 fx ? 12 11 rn 10 9 2 8 7 7 5 4 `%j 3 2 ` / f/ �+ / i/'l�f//ll///IoX740,97f o / 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCADO 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 50 Summary for Pond 8P: Cul De Sac Curb Cut Inflow Area = 1.065 ac, 82.91% Impervious, Inflow Depth > 4.40" for 25-yr event Inflow = 7.06 cfs @ 12.05 hrs, Volume= 0.391 af Outflow = 7.06 cfs @ 12.05 hrs, Volume= 0.391 af, Atten= 0%, Lag= 0.0 min Primary = 7.06 cfs @ 12.05 hrs, Volume= 0.391 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 938.43'@ 12.05 hrs Flood Elev= 938.41' Device Routing Invert Outlet Devices #1 Primary 937.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 0.70 Width (feet) 4.00 12.00 20.00 Primary OutFlow Max=7.05 cfs @ 12.05 hrs HW=938.43' TW=837.08' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 7.05 cfs @ 2.01 fps) Pond 8P: Cul De Sac Curb Cut Hydrograph ■Inflow I 7 06.cry I 0 Primary 7 Inflow Area=1 .065''°6° Peak Elev=938.43' 6 5 t A. w ' 4 i VA3 2 0 f,///1.//! f�*a yrip./z, err/ ,/IT.!z/za✓. •0/fs,�i///a Oi//i'//.//. rceioo, 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 51 Summary for Pond 9P: Southwest Curb Cut Inflow Area = 0.391 ac, 76.47% Impervious, Inflow Depth > 4.20" for 25-yr event Inflow = 2.51 cfs @ 12.05 hrs, Volume= 0.137 af Outflow = 2.51 cfs @ 12.05 hrs, Volume= 0.137 af, Atten= 0%, Lag= 0.0 min Primary = 2.51 cfs @ 12.05 hrs, Volume= 0.137 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.78'@ 12.05 hrs Flood Elev= 937.94' Device Routing Invert Outlet Devices #1 Primary 937.52' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=2.51 cfs @ 12.05 hrs HW=937.78' TW=0.00' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 2.51 cfs @ 1.56 fps) Pond 9P: Southwest Curb Cut Hydrograph / I Inflow 2.51 cfs I El Primary Inflow Area=0.391 '2•51cfs Peak EIev=937.78' itAA 2 rig j `#% off//// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCADO 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Pacie 52 Summary for Pond 10P: Southwest Curb Cut Inflow Area = 0.362 ac, 97.79% Impervious, Inflow Depth > 4.87" for 25-yr event Inflow = 2.53 cfs @ 12.05 hrs, Volume= 0.147 af Outflow = 2.53 cfs @ 12.05 hrs, Volume= 0.147 af, Atten= 0%, Lag= 0.0 min Primary = 2.53 cfs @ 12.05 hrs, Volume= 0.147 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.45'@ 12.05 hrs Flood Elev= 937.66' Device Routing Invert Outlet Devices #1 Primary 937.19' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=2.52 cfs @ 12.05 hrs HW=937.45' TW=837.08' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 2.52 cfs @ 1.57 fps) Pond 10P: Southwest Curb Cut Hydrograph ■Inflow I 2.53 cfs I 0 Primary Inflow Area=0.3621 `s Peak Elev=937.45' 100 2 004 rig 10 0 J`� LL 000 !457:061 7...�4;",/ ./1 V 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 53 Summary for Pond 11P: Southwest Curb Cut Inflow Area = 0.388 ac, 97.42% Impervious, Inflow Depth > 4.87" for 25-yr event Inflow = 2.71 cfs @ 12.05 hrs, Volume= 0.158 af Outflow = 2.71 cfs @ 12.05 hrs, Volume= 0.158 af, Atten= 0%, Lag= 0.0 min Primary = 2.71 cfs @ 12.05 hrs, Volume= 0.158 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.24'@ 12.05 hrs Flood Elev= 937.41' Device Routing Invert Outlet Devices #1 Primary 936.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=2.70 cfs @ 12.05 hrs HW=937.24' TW=837.08' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 2.70 cfs @ 1.59 fps) Pond 11P: Southwest Curb Cut Hydrograph Inflow 3 12.7!cfs 0 Primary Inflow Area=0.3881271 Peak Elev=937.24' 2 worett FA Eit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 54 Summary for Pond 12P: Proposed Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 4.30" for 25-yr event Inflow = 13.11 cfs @ 12.05 hrs, Volume= 0.740 of Outflow = 12.87 cfs @ 12.06 hrs, Volume= 0.740 af, Atten= 2%, Lag= 0.8 min Primary = 12.87 cfs @ 12.06 hrs, Volume= 0.740 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 837.08'@ 12.06 hrs Surf.Area= 2,490 sf Storage= 671 cf Flood Elev= 837.10' Surf.Area= 2,677 sf Storage= 717 cf Plug-Flow detention time= 1.7 min calculated for 0.740 af(100% of inflow) Center-of-Mass det. time= 1.4 min ( 761.0- 759.7 ) Volume Invert Avail.Storage Storage Description #1 836.42' 7,365 cf Custom Stage Data (Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 836.42 100 0 0 837.00 1,630 502 502 838.00 12,097 6,864 7,365 Device Routing Invert Outlet Devices #1 Primary 836.42' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.58 1.58 Width (feet) 0.00 16.00 35.00 Primary OutFlow Max=12.85 cfs @ 12.06 hrs HW=837.08' TW=0.00' (Dynamic Tailwater) t1=Custom Weir/Orifice (Weir Controls 12.85 cfs @ 2.14 fps) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 25-yr Rainfall=5.23" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 55 Pond 12P: Proposed Swale Hydrograph / ®Inflow ` 11s>>�l p Primary 14 Inflow Area=2.06611287cf5 13 12 Peak EIev=837.08' / 11 10 Storage=671 cf ottA 8 2. 0 V 7 LL 6 1� 5 4 4 3 %�r r 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 56 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method SubcatchmentlS: DA-1 Runoff Area=1.011 ac 83.38% Impervious Runoff Depth>6.35" Flow Length=400' Tc=7.0 min CN=93 Runoff=8.74 cfs 0.535 of Subcatchment2S: DA-2 Runoff Area=0.391 ac 76.47% Impervious Runoff Depth>6.11" Flow Length=157' Tc=7.0 min CN=91 Runoff=3.31 cfs 0.199 of Subcatchment3S: DA-3 Runoff Area=0.148 ac 0.00% Impervious Runoff Depth>3.66" Tc=7.0 min CN=69 Runoff=0.78 cfs 0.045 af Subcatchment4S: DA-4 Runoff Area=0.054 ac 74.07% Impervious Runoff Depth>6.00" Tc=7.0 min CN=90 Runoff=0.45 cfs 0.027 af Subcatchment5S: DA-5 Runoff Area=0.388 ac 97.42% Impervious Runoff Depth>6.82" Tc=7.0 min CN=97 Runoff=3.45 cfs 0.220 of Subcatchment6S: DA-6 Runoff Area=0.362 ac 97.79% Impervious Runoff Depth>6.82" Tc=7.0 min CN=97 Runoff=3.22 cfs 0.206 af Subcatchment7S: DA-7 Runoff Area=0.251 ac 0.00% Impervious Runoff Depth>3.66" Tc=7.0 min CN=69 Runoff=1.33 cfs 0.077 of Reach 13R: Existing Highway 5 Road Ditch Inflow=4.09 cfs 0.244 of Outflow=4.09 cfs 0.244 af Reach 14R: Existing Swale Inflow=16.80 cfs 1.064 af Outflow=16.80 cfs 1.064 of Reach 15R: Flow To Existing Pond Inflow=20.83 cfs 1.308 af Outflow=20.83 cfs 1.308 af Pond BP: Cul De Sac Curb Cut Peak Elev=938.50' Inflow=9.19 cfs 0.562 of Outflow=9.19 cfs 0.562 af Pond 9P: Southwest Curb Cut Peak Elev=937.83' Inflow=3.31 cfs 0.199 of Outflow=3.31 cfs 0.199 of Pond 10P: Southwest Curb Cut Peak Elev=937.49' Inflow=3.22 cfs 0.206 of Outflow=3.22 cfs 0.206 af Pond 11P: Southwest Curb Cut Peak EIev=937.28' Inflow=3.45 cfs 0.220 of Outflow=3.45 cfs 0.220 of Pond 12P: Proposed Swale Peak Elev=837.16' Storage=890 cf Inflow=17.20 cfs 1.064 of Outflow=16.80 cfs 1.064 af Total Runoff Area = 2.605 ac Runoff Volume = 1.309 af Average Runoff Depth = 6.03" 26.53% Pervious = 0.691 ac 73.47% Impervious = 1.914 ac 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 57 Summary for Subcatchment 1S: DA-1 Runoff = 8.74 cfs @ 12.05 hrs, Volume= 0.535 af, Depth> 6.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.843 98 Paved parking, HSG B 0.168 69 50-75% Grass cover, Fair, HSG B 1.011 93 Weighted Average 0.168 16.62% Pervious Area 0.843 83.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0160 1.18 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.81" 2.9 300 0.0070 1.70 Shallow Concentrated Flow, Paved Kv= 20.3 fps 4.3 400 Total, Increased to minimum Tc= 7.0 min Subcatchment 1S: DA-1 Hydrograph 0 Runoff 9 i 8.74 cfs i fe_text_mean - Stillwater' 8 MN 24-hr SO 100-yr 0 7 Rainfall=7.18" 00 6 Runoff Area=1.011 ac 3Runoff Volume=0.535 af 0 0 5 Runoff Depth>6.35 4 3 Flow Length=400' min 2 CN 93 t 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 58 Summary for Subcatchment 2S: DA-2 Runoff = 3.31 cfs @ 12.05 hrs, Volume= 0.199 af, Depth> 6.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.299 98 Paved parking, HSG B 0.092 69 50-75% Grass cover, Fair, HSG B 0.391 91 Weighted Average 0.092 23.53% Pervious Area 0.299 76.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 40 0.0350 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 117 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 5.0 157 Total, Increased to minimum Tc = 7.0 min Subcatchment 2S: DA-2 Hydrograph O Run.noff 13.31 cis fe_text_mean - Stillwater" 3 MN 24-hr SO 100-yr Rainfall=7.18" Runoff Area=0.391 ac 000 2 Runoff Volume=0.199 of Runoff Depth>6.11" Flow Length=157' 1 Tc=7.0 min CN=91 % 0 z row 7.1.40./1'0:44Mfr/�/�/./,�//,J�,/. o,. /.w 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 59 Summary for Subcatchment 3S: DA-3 Runoff = 0.78 cfs @ 12.05 hrs, Volume= 0.045 af, Depth> 3.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.148 69 50-75% Grass cover, Fair, HSG B 0.148 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: DA-3 Hydrograph 0.85 / ❑Runoff 0.8 l 0.78 cfs i 075 fe_text mean - Stillwater 0.7 MN 24-hr SO 100-yr 0.65. Rainfall=7.18" 0.6 0.55 Runoff Area=0.148 ac I w 0.5 Runoff Volume=0.045 af 0.45 0.4 Runoff Depth>3.66" LL 0.33 Tc=7.0 min 0 0.25 CN=69 ,0/ ° oo 0.15 0.1 0.05 /. �.��i��� ° r/.+./rereer. 00..ILII%,ff�fr.W+W'/.✓I/l//IW.�..sWMmit19 fi �i������� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 60 Summary for Subcatchment 4S: DA-4 Runoff = 0.45 cfs @ 12.05 hrs, Volume= 0.027 af, Depth> 6.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.040 98 Paved parking, HSG B 0.014 69 50-75% Grass cover, Fair, HSG B 0.054 90 Weighted Average 0.014 25.93% Pervious Area 0.040 74.07% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 4S: DA-4 Hydrograph 7 0.5 0.48 ❑Runoff 0.46 (0.45 cfs J 0.44 fe_text_mean - Stillwater 0.42S MN 24-hr O 100-yr 0.4 0.36 Rainfall=7.18" 0.34 0.32 Runoff Area=0.054 ac 0.3 0.28 Runoff Volume=0.027 af 0.26 3 024 Runoff Depth>6.00" L.T. 0.22 02 Tc=7.0 min 0.18 0.16 0.14 CN=90 r j .12 0.1 0.08 06 % 0.04 ���;r,� 0.02 / 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 61 Summary for Subcatchment 5S: DA-5 Runoff = 3.45 cfs @ 12.05 hrs, Volume= 0.220 af, Depth> 6.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.378 98 Paved parking, HSG B 0.010 69 50-75% Grass cover, Fair, HSG B 0.388 97 Weighted Average 0.010 2.58% Pervious Area 0.378 97.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: DA-5 Hydrograph 0 Runoff 13.45 cfs fe_text_mean - Stillwater 04 3 MN 24-hr SO 100-yr OA rA Rainfall=7.18" Runoff Area=0.388 ac i 17 Runoff Volume=0.220 af 2 Runoff Depth>6.82" LL Tc=7.0 min 1 CN=97 j er/ice ��r.�i,,r� 7.2zf . 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 62 Summary for Subcatchment 6S: DA-6 Runoff = 3.22 cfs @ 12.05 hrs, Volume= 0.206 af, Depth> 6.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.354 98 Paved parking, HSG B 0.008 69 50-75% Grass cover, Fair, HSG B 0.362 97 Weighted Average 0.008 2.21% Pervious Area 0.354 97.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: DA-6 Hydrograph ❑Runoff 13.22 cfs I fe_text_mean - Stillwater 3 MN 24-hr SO 100-yr �� Rainfall=7.18" Runoff Area=0.362 ac 1,4 2 Runoff Volume=0.206 af Runoff Depth>6.82" LL Tc=7.0 min CN=97 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe_text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 63 Summary for Subcatchment 7S: DA-7 Runoff = 1.33 cfs @ 12.05 hrs, Volume= 0.077 af, Depth> 3.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs fe_text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Area (ac) CN Description 0.251 69 50-75% Grass cover, Fair, HSG B 0.251 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: DA-7 Hydrograph / 0 Runoff 1.33 cis fe_text_mean - Stillwater 'l MN 24-hr SO 100-yr Rainfall=7.18" 10 1 Runoff Area=0.251 ac Runoff Volume=0.077 af oft Runoff Depth>3.66" LL Tc=7.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 64 Summary for Reach 13R: Existing Highway 5 Road Ditch Inflow Area = 0.539 ac, 55.47% Impervious, Inflow Depth > 5.44" for 100-yr event Inflow = 4.09 cfs @ 12.05 hrs, Volume= 0.244 af Outflow = 4.09 cfs @ 12.05 hrs, Volume= 0.244 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 13R: Existing Highway 5 Road Ditch Hydrograph / ■Inflow 14.09 cfs i 0 Outflow Inflow Area=0.5391-;s 4 101. 3 i LL 2 040 //%//!//f/// —•''%• ,!/I.//J!/i///Ji///ezezo 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Pace 65 Summary for Reach 14R: Existing Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 6.18" for 100-yr event Inflow = 16.80 cfs @ 12.06 hrs, Volume= 1.064 af Outflow = 16.80 cfs @ 12.06 hrs, Volume= 1.064 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 14R: Existing Swale Hydrograph / ■Inflow 18 1ssocrs I 0 Outflow` 17 Inflow Area=2.066'ao cfs 16 15 14 13 12 y11 ; 10 c 9. f LL 86 r . 7 5 3 /4` � F' 1 . /774:40s r *'*`y^V ' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 66 Summary for Reach 15R: Flow To Existing Pond Inflow Area = 2.605 ac, 73.47% Impervious, Inflow Depth > 6.03" for 100-yr event Inflow = 20.83 cfs @ 12.06 hrs, Volume= 1.308 af Outflow = 20.83 cfs @ 12.06 hrs, Volume= 1.308 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Reach 15R: Flow To Existing Pond Hydrograph / ■Inflow 23 120.83 cfs I Ell Outflow 22 21Inflow Area=2.6O5'ca8 ' 20 tdi 11 19 18 17 16 15 14 w 13 12 11 1�2 10 9 8 f , 7 5 4 2 A.� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 67 Summary for Pond 8P: Cul De Sac Curb Cut Inflow Area = 1.065 ac, 82.91% Impervious, Inflow Depth > 6.33" for 100-yr event Inflow = 9.19 cfs @ 12.05 hrs, Volume= 0.562 af Outflow = 9.19 cfs @ 12.05 hrs, Volume= 0.562 af, Atten= 0%, Lag= 0.0 min Primary = 9.19 cfs @ 12.05 hrs, Volume= 0.562 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 938.50'@ 12.05 hrs Flood Elev= 938.41' Device Routing Invert Outlet Devices #1 Primary 937.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 0.70 Width (feet) 4.00 12.00 20.00 Primary OutFlow Max=9.18 cfs @ 12.05 hrs HW=938.50' TW=837.15' (Dynamic Tailwater) t-1=Custom Weir/Orifice (Weir Controls 9.18 cfs @ 2.13 fps) Pond 8P: Cul De Sac Curb Cut Hydrograph / U Inflow 10 19.19c1s 0 Primary Inflow Area=1 .0651:3'9 8 Peak EIev=938.50' 7 (� 6 ll� 0 5 4 0' 3 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 68 Summary for Pond 9P: Southwest Curb Cut Inflow Area = 0.391 ac, 76.47% Impervious, Inflow Depth > 6.11" for 100-yr event Inflow = 3.31 cfs @ 12.05 hrs, Volume= 0.199 af Outflow = 3.31 cfs @ 12.05 hrs, Volume= 0.199 af, Atten= 0%, Lag= 0.0 min Primary = 3.31 cfs @ 12.05 hrs, Volume= 0.199 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.83'@ 12.05 hrs Flood Elev= 937.94' Device Routing Invert Outlet Devices #1 Primary 937.52' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=3.31 cfs @ 12.05 hrs HW=937.83' TW=0.00' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 3.31 cfs @ 1.67 fps) Pond 9P: Southwest Curb Cut Hydrograph ®Inflow 13.31 cfs I 0 Primary Inflow Area=0.391 13,31 ofs 3 Peak Elev=937.83' N u 2 LL 1 1 �raa / / ./'/'Ir//f.07,07,74 .moi//.�ilai�f/r/i'///l/''Of 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 69 Summary for Pond 10P: Southwest Curb Cut Inflow Area = 0.362 ac, 97.79% Impervious, Inflow Depth > 6.82" for 100-yr event Inflow = 3.22 cfs @ 12.05 hrs, Volume= 0.206 af Outflow = 3.22 cfs @ 12.05 hrs, Volume= 0.206 af, Atten= 0%, Lag= 0.0 min Primary = 3.22 cfs @ 12.05 hrs, Volume= 0.206 af Routing by Dyn-Stor-lnd method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.49'@ 12.05 hrs Flood Elev= 937.66' Device Routing Invert Outlet Devices #1 Primary 937.19' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=3.22 cfs @ 12.05 hrs HW=937.49' TW=837.15' (Dynamic Tailwater) L1=Custom Weir/Orifice (Weir Controls 3.22 cfs @ 1.66 fps) Pond 10P: Southwest Curb Cut Hydrograph ®Inflow I 3.22 ds I 0 Primary Inflow Area=0.362'3220 OPF 3 Peak Elev=937.49' 0 w 2 iLA LL // .40 •a !/ 074(/s/f! //OW:/J//%//fj � : . . s �. / i/c %I i o / ✓/4"4".//// / 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCADO 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 70 Summary for Pond 11P: Southwest Curb Cut Inflow Area = 0.388 ac, 97.42% Impervious, Inflow Depth > 6.82" for 100-yr event Inflow = 3.45 cfs @ 12.05 hrs, Volume= 0.220 af Outflow = 3.45 cfs @ 12.05 hrs, Volume= 0.220 af, Atten= 0%, Lag= 0.0 min Primary = 3.45 cfs @ 12.05 hrs, Volume= 0.220 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 937.28'@ 12.05 hrs Flood Elev= 937.41' Device Routing Invert Outlet Devices #1 Primary 936.97' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.50 Width (feet) 4.00 12.00 Primary OutFlow Max=3.45 cfs @ 12.05 hrs HW=937.28' TW=837.15' (Dynamic Tailwater) 4-1=Custom Weir/Orifice (Weir Controls 3.45 cfs @ 1.69 fps) Pond 11P: Southwest Curb Cut Hydrograph ®Inflow I D Primary Inflow Area=0.388® Peak Elev=937.28' g� 3 2 LL 4 zoi 0 %///i/////d//./xe.w///oz;;�////// .I''//////ll//////l/�///////////////�/.✓ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 18332 Proposed Conditions fe text mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Page 71 Summary for Pond 12P: Proposed Swale Inflow Area = 2.066 ac, 78.17% Impervious, Inflow Depth > 6.18" for 100-yr event Inflow = 17.20 cfs @ 12.05 hrs, Volume= 1.064 af Outflow = 16.80 cfs @ 12.06 hrs, Volume= 1.064 af, Atten= 2%, Lag= 0.9 min Primary = 16.80 cfs @ 12.06 hrs, Volume= 1.064 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 837.16'@ 12.06 hrs Surf.Area= 3,285 sf Storage= 890 cf Flood Elev= 837.10' Surf.Area= 2,677 sf Storage= 717 cf Plug-Flow detention time= 1.5 min calculated for 1.064 af(100% of inflow) Center-of-Mass det. time= 1.3 min ( 754.4 - 753.1 ) Volume Invert Avail.Storage Storage Description #1 836.42' 7,365 cf Custom Stage Data (Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 836.42 100 0 0 837.00 1,630 502 502 838.00 12,097 6,864 7,365 Device Routing Invert Outlet Devices #1 Primary 836.42' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.58 1.58 Width (feet) 0.00 16.00 35.00 Primary OutFlow Max=16.77 cfs @ 12.06 hrs HW=837.16' TW=0.00' (Dynamic Tailwater) 4-1=Custom Weir/Orifice (Weir Controls 16.77 cfs @ 2.27 fps) 18332 Proposed Conditions fe text_mean - Stillwater, MN 24-hr SO 100-yr Rainfall=7.18" Prepared by ISENGINEERS Printed 1/25/2016 HydroCAD® 10.00-12 s/n 02403 ©2014 HydroCAD Software Solutions LLC Pace 72 Pond 12P: Proposed Swale Hydrograph 19 / ®Inflow 117200s( ❑Primary 18 Inflow Area=2.066 16.8;cis 17 116 5 Peak Elev=837.16' 14 Storage=890 cf 13= 12= rn 11. = 10 0 8_ 6? 5? 4� 33 23 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours)