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HomeMy WebLinkAbout2019-04-09 Storm Water Management Plan Storm Water Management Plan Calculations & Summaries Central Automotive Project No. 15265 Cle April 9, 2019 I hereby certify that this plan, specification or report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. C:1 NOT FOR CONSTRUCTION Robert L. Swanson, P.E. Reg. No. 24094 Prepared By: Prepared For: Anderson Engineering of MN, LLC HTG, Architects 13605 1st Avenue North, Suite 100 9300 Hennepin Town Road Plymouth, MN 55441 Minneapolis, MN 55347 Ph: 763.412.4000 Ph: 952.278.8880 Fax: 763.412.4090 Fax: 952.278.8822 II RECEIVED APR 1 0 2019 N D E R S a N Anderson Engineering of Minnesota,LLC •13605 1st Avenue North,Suite 100•Plymouth,Minnesota 55441 •(763)412-4000 Main•(763)412-4090 Fax•www.ae-mn.com Table of Contents • Cover/ Certification Page • Table of Contents • Project Overview • Existing Site Conditions • Soils • Proposed Site Conditions • Methodology • Summary Appendix — Exhibits and Calculations • A— Existing Drainage Map • B — Proposed Drainage Map • C — HydroCAD Reports • D — Grading, Drainage, & Erosion Control Plan • E — Web Soil Survey 1iPage Stormwater Narrative/Summary April 9, 2019 Central Automotive Oak Park Heights, MN Project Overview Construction of a new automotive repair shop is proposed in the NE1/4 of NE1/4 of Sec. 4, T29N, R2OW in Oak Park Heights, Minnesota. The property currently consists of primarily woodland. The project is located in Washington County, and within the Middle St. Croix Watershed(MSCWMO). This report is prepared based on MSCWMO rules & regulations. The project includes site clearing and demolishing of existing woodland, construction of a 6,600 SF building, installation of parking lot facilities, and construction of an infiltration basin located east of the facility. Existing Site Conditions The 2.61-acre property is bounded by 59th St. to the north and Osgood Avenue North to the west. The property is primarily woodland with existing apartment complexes to the south. The existing topography of the site generally drains to the south and east. See Exhibit A — Existing Drainage Map, for existing topography, drainage, and sub-catchment areas. Soils The preliminary analysis of site soil types on this project should be Hydraulic Soil Type B, primarily silt loam. This preliminary soil classification is based upon the Washington County web soil survey found at the USDA website (See Exhibit E - Web Soil Survey). Slopes on site typically range from 5-15% creating a gentle rolling landscape, with a few smaller areas approaching 2:1 slopes. Per the Minnesota Stormwater Manual, an infiltration rate of 0.45 inches/hour was used in modeling proposed conditions. Proposed Site Conditions The development will consist of constructing a 6,600 SF slab on grade building, a paved parking lot, a short retaining wall south of the building, and an infiltration basin to the east. The proposed drainage pattern will be somewhat unchanged. The building and parking lot drainage will be conveyed via storm sewer, and outlet into a proposed infiltration basin. Pre-treatment prior to entering the infiltration basin will be accomplished via sump manhole with a SAFL baffle. The infiltration basin outlets into a storm sewer that will tie-in to an existing stub roughly 220 feet north of the basin. Drainage on the eastern half of the site will remain unchanged. The proposed sub-watersheds have been depicted on Exhibit B— Proposed Drainage Map attached in the appendix of this report. Methodology Erosion and Sediment Control Exhibit D: Sheet C4 - Grading, Drainage & Erosion Control Plan of the accompanying plan-set depicts the temporary and permanent sediment control practices employed, which include; Silt Fencing, Inlet Filter Scaks, Construction Entrance, Erosion Blanket and a Concrete Wash Area, as shown on the drawings. 21 Page Stormwater Narrative/Summary April 9, 2019 Central Automotive Oak Park Heights, MN HydroCAD The hydrologic characteristics of the site were modeled using HydroCAD software. TR55/TR20 methods were utilized. Existing and proposed drainage areas were determined via review of current land survey data and aerial photos. The 2, 10, & 100-year frequency events where analyzed for peak runoff rate control in the existing and proposed conditions. The MSE-3 24-hr rainfall distribution for Washington County was used. Depths for the 2, 10, & 100-year storms were found to be 2.80", 4.16", and 7.20" respectively. Runoff from pervious and impervious surfaces were calculated separately to more accurately model the runoff volume from the site surfaces. Results of this analysis are summarized in Table 1 below, and a report can be seen in Exhibit C-HydroCAD Report. Table 1: Existing vs. Proposed Runoff Rates Reach ID Storm Event Existing Rate Post Development (CFS) Rate (CFS) 2YR- 2.8" 0.38 0.08 R-1 10YR- 4.16" 1.74 0.39 100YR- 7.2" 6.25 1.39 2YR- 2.8" 0.21 0.21 R-2 10YR- 4.16" 0.92 0.94 100YR- 7.2" 3.15 3.24 2YR- 2.8" 0.10 0.10 R-3 10YR-4.16" 0.48 0.48 100YR- 7.2" 1.69 1.69 2YR- 2.8" 0.07 0.07 R-4 10YR-4.16" 0.32 0.32 100YR- 7.2" 1.15 1.15 2YR- 2.8" 0.0 0.06 R-5 10YR- 4.16" 0.0 0.23 100YR- 7.2" 0.0 0.76 2YR- 2.8" 0.76 0.52 TOTAL 10YR-4.16" 3.46 2.36 100YR- 7.2" 12.24 8.23 Infiltration Basin Design Design parameters of a proposed infiltration basin was based on Hydrologic Soil Group B infiltration rate of 0.45 inches/hour and water quality volume requirements by MSCWMO. The required water quality volume (dead storage) was determined based on 1.1 inches of runoff produced from 21,040 SF of new impervious surfaces. Required Water Quality Volume = 1.1"runoff x(1 ft/12")x 21,040 f t2 = 1929 f t3 3IPage Stormwater Narrative/Summary April 9, 2019 Central Automotive Oak Park Heights, MN In addition to the volume requirement, an infiltration rate of 0.45 inches/hour was used to determine the depth of the dead storage required to drain the basin in 48 hours. Required Dead Storage Depth = 0.45"/hour x lft/12"x 48 hours = 1.8 f t Based on these requirements, an outlet pipe was incorporated in the infiltration basin design to manage ponding depth and rate control of effluent storm water. The tables below summarize the proposed infiltration basin storage and rate control calculations. Table 2— Infiltration Basin Storage (P-1) Elevation Surface Area (SF) Incremental Cumulative Storage (CF) Storage (CF) 899.5 1598 0 0 900 1842 859 859 901 2717 2265 3125 901.3(1) 2946 849 3974(2) 902 3684 3188 6313 903 5202 4421 10734 904 6638 5905 16640 905 8554 7576 24215 Notes: 1) Outlet pipe invert elevation 2) Water quality volume provided Table 3: Infiltration Basin Summary (P-1) Storm Event Basin Inflow Basin Outflow Post Development (CFS) (CFS) HWL 2YR— 2.8" 1.73 0.01 901.00 10YR— 4.16" 3.42 0.23 901.52 100YR— 7.2" 7.45 2.66 902.28 The provided water quality volume of 3,974 cubic feet exceeds the required volume of 1,929 cubic feet. Post-development discharge rates are less than the existing rates for each storm event, and the 100-year high water level has a minimum of 2.5 feet of freeboard before discharging to 59th Street, north of the basin, via emergency overland flow. Summary The site layout and final grading is designed to take advantage of the existing terrain for drainage, existing soil for infiltration, and minimizing post-development storm water runoff. Within the project boundary, some changes to the existing drainage patterns are expected due to the construction of the building, parking lot, and other site improvements. The project design does not propose to make major changes to drainage divides. 41 Page 80.2 n....\.8_1n+o7_..aha\1528S.Lac:o 2018\,sus_un..m(24430\15285_2_40*\ . m X PI I COo 44 _ _ _ : : - q -� _ -- - - _ , - r - - - - - - - - D § I OSGOOD AVENUE NORTH 0 ) O — >Q -,., e on O .: i3 It - n O, \ Y Ian 'FE O'i `O 40\= ! \ \ — — — — tl,tlp ' I 6 046 oi to 'S' .., ,♦'.rtep; is } iii ° V 2 ,,C,'1 .11'1.111111111111111111%111111111UMMEMINiil'.% ', 0 3 � a[ O 4 , 4 % � ✓i A �►,a � 34 O3�/. O; . gift / 1 :• ! V ^' c. / / , , , W \ o 7 .. i A rn d Z i 2. m K .D >00 13 �DC' m 2 me> S r W v r g 11 O ! § 0 O3 SA zA _ ` f �' c I a o $ F w ; i o o Ell= 3 U > d hf flnoma\w 9.,,,..Fy\15L5..._IJAC)OO SOI!\15385 .....,04,00\15355c. ..\ Z-uu•u rn X I CV R e., CO — _ Q r/ l R 1o = — i /i 't' _ ° : jam_ —. if,-. Ilei yit is a s'9 le—— AV • IIS¢'n !g ti ° 12 ."GN Illp ; *•Ill O?0 \ L ‘ : '-.-.,,;(2 AS ... .s, '7-''y, ,., ,‘. t:g 23 14 li .: r...>'''''''' ', ''- a2-'7 .---_ _ . 1 Inn ori \e A 21O m O 1 73 z n r m K D v x71z D A �)D m m m ® 4 Zo rm iC 1 N r W w .r. r S M N II 9 a a O F 3 , F,..3' c A A m EXHIBIT C R-4 jdorth Off-site S-4 R-5 (new Subcat) R-3 Road Off-site NE On-site (new Subcat) S-1 > R-2 S-2 --- (new Subcat) (new Subcat) East Off-site R-1 South Off-site 1; Subcat 'Reach' Pond Link Routing Diagram for 15265 existing Prepared by Microsoft, Printed 4/2/2019 HydroCAD®10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC 15265 existing Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 2 Project Notes Defined 3 rainfall events from Oak Park Heights IDF IDF Rainfall events imported from "NRCS-Rain.txt" for 5382 MN Washington 15265 existing Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 3 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.608 61 >75% Grass cover, Good, HSG B (S-1, S-2, S-3, S-4) 2.608 61 TOTAL AREA 15265 existing Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 4 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.608 HSG B 5-1, S-2, S-3, S-4 0.000 HSG C 0.000 HSG D 0.000 Other 2.608 TOTAL AREA 15265 existing Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 5 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 2.608 0.000 0.000 0.000 2.608 >75% Grass cover, Good S-1, S-2, S-3, S-4 0.000 2.608 0.000 0.000 0.000 2.608 TOTAL AREA 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment S-1: (new Subcat) Runoff = 0.38 cfs @ 12.21 hrs, Volume= 0.030 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 59,664 61 >75% Grass cover, Good, HSG B 59,664 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 33 0.1800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 6.2 110 0.0900 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.7 95 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 8.7 238 Total Subcatchment S-1: (new Subcat) Hydrograph 0.42 0.4 Runoff 0.38 cfs J 0.38= 0.36 MSE 24-hr 3 0:32_ 2-Year Rainfall=2.80" 03- Runoff Area=59,664 sf 0.28 0.26= Runoff Volume=0.030 af 0.24 0.22 Runoff Depth>0.27" LLo o 8 - I Flow Length=238' 0.16iTc=8.7 min 0.14 a °.12= CN=61 0.08- 0.06 0.04 0 r/ 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment S-2: (new Subcat) Runoff = 0.21 cfs @ 12.16 hrs, Volume= 0.013 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 26,248 61 >75% Grass cover, Good, HSG B 26,248 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.5 88 0.1250 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.5 77 0.0260 2.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.0 165 Total Subcatchment S-2: (new Subcat) Hydrograph 0.23i 0.22= Runoff 0.21: l o.21 cfs I 0.21 MSE 24-hr 3 019= 2-Year Rainfall=2.80" 016 Runoff Area=26,248 sf 015= 0.14. Runoff Volume=0.013 af 013= Runoff Depth>0.27" 0.12= LL 0.1v: Flow Length=165' 009' Tc=5.0 min 0.06- CN=61 ii/M1111k 0.05= 0.04 0.03= 0.02= 0.01 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment S-3: (new Subcat) Runoff = 0.10 cfs @ 12.20 hrs, Volume= 0.008 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 15,370 61 >75% Grass cover, Good, HSG B 15,370 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 88 0.0340 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-3: (new Subcat) Hydrograph 0.114 ❑Runoff 0.105= I o.Aod.l 0.0951= MSE 24-hr 3 2-Year Rainfall=2.80" 0.085= 0.084 Runoff Area=15 370 sf 0.075= 007_ Runoff Volume=0.008 af w 0.065 0.06= Runoff Depth>0.27" 0.055-1:' o 0.054 Flow Length=88' 0.045 0.04= - Slope=0.0340 '/' 0.035= - 0.03' Tc=7.6 min 0.025 0.02= CN=61 0.015 0.01 0.005'_ - 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment S-4: (new Subcat) Runoff = 0.07 cfs @ 12.26 hrs, Volume= 0.006 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 12,324 61 >75% Grass cover, Good, HSG B 12,324 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 17 0.3500 0.35 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 10.7 126 0.0300 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.2 65 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 11.7 208 Total Subcatchment S-4: (new Subcat) Hydrograph 7 0.075_ LJ Runoff 0.07-1 10.07 cfs 0.065 4. MSE 24-hr 3 0.06= 2-Year Rainfall=2.80" 0.055- Runoff Area=12,324 sf 0.05- 0.045 Runoff Volume=0.006 af 15. 0.04 Runoff Depth>0.27" 0 0.035 Flow Length=208' 0.037 Tc=11 .7 min 0.025 0.02 CN=61 0.015- 0.01- 0.005 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 10 Summary for Reach R-1: South Off-site Inflow Area = 1.370 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.38 cfs @ 12.21 hrs, Volume= 0.030 af Outflow = 0.38 cfs @ 12.21 hrs, Volume= 0.030 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-1: South Off-site / Hydrograph 0.42J ®Inflow ().41 10.38 cfs, l❑Outflow l 0.38' 038 cfs Inflow Area=1 .370 ac 0.36= 0.34' 0.321 0.3= 0.281 0.261 l w 0.24 -9- 0.221 c 0.2= a 0.18 0.161 0.14' 0.12; 0.1; 0.08 0.06 0.04: 44,��� 0.02= /e� _:. 0 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 11 Summary for Reach R-2: East Off-site Inflow Area = 0.603 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.21 cfs @ 12.16 hrs, Volume= 0.013 af Outflow = 0.21 cfs @ 12.16 hrs, Volume= 0.013 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-2: East Off-site Hydrograph ❑Inflow II 0.23= 10.21631 ❑Outflow 0.22y 0.21 deInflow Area=0.603 ac 0.21 0.2= 0.19= 0.18= 0.17= 0.16 0.15 0.14 v 0.13= 0.12' 0 0.11 #� LL 0.1 0.09 0.08 0.07 0.06 0.05 0.040.03 0.02 /V" 0.01 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 12 Summary for Reach R-3: NE On-site Inflow Area = 0.353 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.10 cfs @ 12.20 hrs, Volume= 0.008 af Outflow = 0.10 cfs @ 12.20 hrs, Volume= 0.008 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-3: NE On-site Hydrograph 0 Inflow 0.11= ❑Outflow 0105. °':cfs, Inflow Area=0.353 ac 0.1_ 0.095= r 0.085= .V 0.08 0.075 0.07-; `• 13-0.065= '; 0.06 3 0.055 \//) °° 0.05= 0.045- 0.04 0.035 0.03 0.025 L. 0. 0.01515 0.01_ o��//4 0.005= 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 13 Summary for Reach R-4: North Off-site Inflow Area = 0.283 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.07 cfs @ 12.26 hrs, Volume= 0.006 af Outflow = 0.07 cfs @ 12.26 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-4: North Off-site Hydrograph ❑Inflow 0.075-= 10.17 crs I ❑Outflow 0.07= I0.07cfsr. Inflow Area=0.283 ac 0.065 0.06 0.055_ A 0.05 0.045 N `-'. 0.04 0 0.035 LL 0.03- 0.025= 0.02 0.015 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 14 Summary for Reach R-5: Road Off-site 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment S-1: (new Subcat) Runoff = 1.74 cfs @ 12.18 hrs, Volume= 0.095 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 59,664 61 >75% Grass cover, Good, HSG B 59,664 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 33 0.1800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 6.2 110 0.0900 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.7 95 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 8.7 238 Total Subcatchment S-1: (new Subcat) Hydrograph Runoff 11.74 ds I MSE 24-hr 3 10-Year Rainfall=4.16" Runoff Area=59,664 sf Runoff Volume=0.095 af Runoff Depth>0.84" u. 2 Flow Length=238' Tc=8.7 min CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment S-2: (new Subcat) Runoff = 0.92 cfs @ 12.13 hrs, Volume= 0.042 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 26,248 61 >75% Grass cover, Good, HSG B 26,248 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.5 88 0.1250 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.5 77 0.0260 2.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.0 165 Total Subcatchment S-2: (new Subcat) Hydrograph 7 1 C. Runoff I 0.92 cfs MSE 24-hr 3 10-Year Rainfall=4.16" Runoff Area=26,248 sf Runoff Volume=0.042 af Runoff Depth>0.84" 0 Flow Length=165' Tc=5.0 min CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfal1=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment S-3: (new Subcat) Runoff = 0.48 cfs @ 12.16 hrs, Volume= 0.025 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 15,370 61 >75% Grass cover, Good, HSG B 15,370 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 88 0.0340 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-3: (new Subcat) Hydrograph 7 E:: Runoff 0.5: i 0.48 cfs,I MSE 24-hr 3 0.45- 10-Year Rainfall=4.16" Runoff Area=15,370 sf 0.35± Runoff Volume=0.025 af 74 °3= Runoff Depth>0.84" o 0.25= Flow Length=88' 02_ Slope=0.0340 '/' Tc=7.6 min 0.11 CN=61 0.051 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment S-4: (new Subcat) Runoff = 0.32 cfs @ 12.22 hrs, Volume= 0.020 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 12,324 61 >75% Grass cover, Good, HSG B 12,324 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 17 0.3500 0.35 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 10.7 126 0.0300 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.2 65 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 11.7 208 Total Subcatchment S-4: (new Subcat) Hydrograph 0.34= L Runoff 10.32 cfs I 0.0.332_ MSE 24-hr 3 0.28= 10-Year Rainfall=4.16" 0.26: Runoff Area=12,324 sf 0.24= 0.22; Runoff Volume=0.020 af 3 02- Runoff Depth>0.84" a,s_ o °.16= Flow Length=208' 014= Tc=11.7 min 0.12= CN=61 0.08 0.06 0.04- ///.7Z Z o- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 19 Summary for Reach R-1: South Off-site Inflow Area = 1.370 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 1.74 cfs @ 12.18 hrs, Volume= 0.095 af Outflow = 1.74 cfs @ 12.18 hrs, Volume= 0.095 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-1: South Off-site Hydrograph D Inflow 11.74 cfs ❑Outflow I174cf5V Inflow Area=1 .370 ac 1 I C ! I LL 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 20 Summary for Reach R-2: East Off-site Inflow Area = 0.603 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.92 cfs @ 12.13 hrs, Volume= 0.042 of Outflow = 0.92 cfs @ 12.13 hrs, Volume= 0.042 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-2: East Off-site Hydrograph / ❑Inflow 1 n Outflow UV Inflow Area=0.603 ac I � O _! I f{/ .✓ G 0 r, . . �. .. . . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 21 Summary for Reach R-3: NE On-site Inflow Area = 0.353 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.48 cfs @ 12.16 hrs, Volume= 0.025 af Outflow = 0.48 cfs @ 12.16 hrs, Volume= 0.025 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-3: NE On-site Hydrograph ❑ Inflow 0.48 cfs L Outflow 05 0.48 cfs Inflow Area=0.353 ac 0.45- 0.4- 0.35- 0.3- 0 0.25 0.2- 0.15-: 0.05 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 22 Summary for Reach R-4: North Off-site Inflow Area = 0.283 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.32 cfs @ 12.22 hrs, Volume= 0.020 af Outflow = 0.32 cfs @ 12.22 hrs, Volume= 0.020 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-4: North Off-site Hydrograph ❑ Inflow 0.34= 10.32as I ❑Outflow 10.32cfs. Inflow Area=0.283 ac 0.32= 0.3= 0.28= 0.26 0.24= 0.22= u 0.2= 3 0.18= E° 0.16; 0.14- 0.12- 0.1. 0.08 0.06 0.02 i P 0' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 23 Summary for Reach R-5: Road Off-site 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment S-1: (new Subcat) Runoff = 6.25 cfs @ 12.17 hrs, Volume= 0.309 af, Depth> 2.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 59,664 61 >75% Grass cover, Good, HSG B 59,664 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 33 0.1800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 6.2 110 0.0900 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.7 95 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 8.7 238 Total Subcatchment S-1: (new Subcat) Hydrograph 7 ©Runoff 16.2s cfs I 6- MSE 24-hr 3 100-Year Rainfall=7.20" 52 Runoff Area=59,664 sf Runoff Volume=0.309 af 4 Runoff Depth>2.70" Er. 3 Flow Length=238' Tc=8.7 m i n 2 CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment S-2: (new Subcat) Runoff = 3.15 cfs @ 12.12 hrs, Volume= 0.136 af, Depth> 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 26,248 61 >75% Grass cover, Good, HSG B 26,248 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.5 88 0.1250 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.5 77 0.0260 2.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.0 165 Total Subcatchment S-2: (new Subcat) Hydrograph 7 Runoff 13.75 cfs I 3 MSE 24-hr 3 100-Year Rainfall=7.20" Runoff Area=26,248 sf Runoff Volume=0.136 af 2 Runoff Depth>2.71" LL Flow Length=165' Tc=5.0 m i n 1 CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment S-3: (new Subcat) Runoff = 1.69 cfs @ 12.15 hrs, Volume= 0.080 af, Depth> 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 15,370 61 >75% Grass cover, Good, HSG B 15,370 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 88 0.0340 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-3: (new Subcat) Hydrog raph 0 Runoff 11.69 did MSE 24-hr 3 100-Year Rainfall=7.20" Runoff Area=15,370 sf Runoff Volume=0.080 af Runoff Depth>2.71" LL Flow Length=88' Slope=0.0340 '/' Tc=7.6 m i n CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment S-4: (new Subcat) Runoff = 1.15 cfs @ 12.20 hrs, Volume= 0.064 af, Depth> 2.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 12,324 61 >75% Grass cover, Good, HSG B 12,324 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 17 0.3500 0.35 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 10.7 126 0.0300 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.2 65 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 11.7 208 Total Subcatchment S-4: (new Subcat) Hydrograph L Runoff 11.15ds I MSE 24-hr 3 1 100-Year Rainfall=7.20" Runoff Area=12,324 sf Runoff Volume=0.064 af Runoff Depth>2.70" LL Flow Length=208' Tc=11 .7 min CN=61 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 28 Summary for Reach R-1: South Off-site Inflow Area = 1.370 ac, 0.00% Impervious, Inflow Depth > 2.70" for 100-Year event Inflow = 6.25 cfs @ 12.17 hrs, Volume= 0.309 af Outflow = 6.25 cfs @ 12.17 hrs, Volume= 0.309 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-1: South Off-site Hydrograph LI Inflow 16.25 as I C Outflow [6.25cis Inflow Area=1 .370 ac 6 5- a 4- c-•-) - V O LL 3 2 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 29 Summary for Reach R-2: East Off-site Inflow Area = 0.603 ac, 0.00% Impervious, Inflow Depth > 2.71" for 100-Year event Inflow = 3.15 cfs @ 12.12 hrs, Volume= 0.136 of Outflow = 3.15 cfs @ 12.12 hrs, Volume= 0.136 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-2: East Off-site Hydrograph ❑Inflow 3.15 cis I C Outflow 13.75ds Inflow Area=0.603 ac 3 w 2 0 LL 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 30 Summary for Reach R-3: NE On-site Inflow Area = 0.353 ac, 0.00% Impervious, Inflow Depth > 2.71" for 100-Year event Inflow = 1.69 cfs @ 12.15 hrs, Volume= 0.080 af Outflow = 1.69 cfs @ 12.15 hrs, Volume= 0.080 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-3: NE On-site Hydrograph / D Inflow 116?cis I D Outflow 11.69afs Inflow Area=0.353 ac 1 0 LL 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 31 Summary for Reach R-4: North Off-site Inflow Area = 0.283 ac, 0.00% Impervious, Inflow Depth > 2.70" for 100-Year event Inflow = 1.15 cfs @ 12.20 hrs, Volume= 0.064 af Outflow = 1.15 cfs @ 12.20 hrs, Volume= 0.064 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-4: North Off-site Hydrograph ❑ Inflow 11.15cfs I ❑Outflow� 11.15ds Inflow Area=0.283 ac O LL tiolt 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 existing MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/2/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 32 Summary for Reach R-5: Road Off-site R-5 (S23Road Off-site North Off-site (Existing S-4) S-2--C- \\ R-3 West to Road Ks-24 V A NE On-site (Existing S-3) \\ Pond CS-21> Building&Lot \\ CS-2 R-2 5I East Off-site East (S-22\ South of Building R-1 South Off-Site KSubca) Reach "on. Link Routing Diagram for 15265 proposed Prepared by Microsoft, Printed 4/3/2019 HydroCAD®10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC 15265 proposed Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 2 Project Notes Defined 3 rainfall events from Oak Park Heights IDF IDF Rainfall events imported from "NRCS-Rain.txt" for 5382 MN Washington 15265 proposed Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 3 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.139 61 >75% Grass cover, Good, HSG B (S-20, S-21, S-22, S-23, S-24, S-25) 0.469 98 Paved parking, HSG B (S-20, S-21) 2.608 68 TOTAL AREA 15265 proposed Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 4 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.608 HSG B S-20, S-21, S-22, S-23, S-24, S-25 0.000 HSG C 0.000 HSG D 0.000 Other 2.608 TOTAL AREA 15265 proposed Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 5 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 2.139 0.000 0.000 0.000 2.139 >75% Grass cover, Good S-20, S-21, S-22, S-23, S-24, S-25 0.000 0.469 0.000 0.000 0.000 0.469 Paved parking S-20, S-21 0.000 2.608 0.000 0.000 0.000 2.608 TOTAL AREA 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment S-20: West to Road Runoff = 0.06 cfs @ 12.11 hrs, Volume= 0.003 af, Depth> 0.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 5,190 61 >75% Grass cover, Good, HSG B 110 98 Paved parking, HSG B 5,300 62 Weighted Average 5,190 97.92% Pervious Area 110 2.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.5 30 0.0670 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-20: West to Road Hydrograph 0.065 Runoff 0.06- I o.06 cfs I MSE 24-hr 3 0.055- 005 2-Year Rainfall=2.80" 0.045; Runoff Area=5,300 sf 0.04- Runoff Volume=0.003 af 0.035 Runoff Depth>0.30" a 0.03- Flow Length=30' 0.025- Slope=0.0670 '/' 0.02 Tc=2.5 m i n 0.015 CN=62 0.01- 0.005 0 . . . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment S-21: Building & Lot Runoff = 1.73 cfs @ 12.15 hrs, Volume= 0.079 af, Depth> 1.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 18,950 61 >75% Grass cover, Good, HSG B 20,301 98 Paved parking, HSG B 39,251 80 Weighted Average 18,950 48.28% Pervious Area 20,301 51.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 33 0.1800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 5.1 83 0.0843 0.27 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 6.9 116 Total Subcatchment S-21: Building & Lot Hydrograph J Runoff (1.73 ds I MSE 24-hr 3 2-Year Rainfall=2.80" Runoff Area=39,251 sf Runoff Volume=0.079 af 1 Runoff Depth>1.05" Flow Length=116' Tc=6.9 min CN=80 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment S-22: South of Building Runoff = 0.08 cfs @ 12.25 hrs, Volume= 0.007 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 14,410 61 >75% Grass cover, Good, HSG B 14,410 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 150 0.0533 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 120 0.0167 1.94 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.8 270 Total Subcatchment S-22: South of Building Hydrograph 0.09= c.Runoff 0.085 l o.oe ds l 0.08 MSE 24-hr 3 0 - :75 07 2-Year Rainfall=2.80" Runoff Area=14,410 sf 0.06 0.055=.: Runoff Volume=0.007 af 0.05 Runoff Depth>0.27" 3 0.045: LL 0.04= Flow Length=270' 0.035. Tc=10.8 min 0.03 0.025_ CN=61 0.02 0.015- 0.01- 0.005- 0 . . 5 6 7 8 9 10 11 12 13 14 15 16* 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment S-23: (Existing S-4) Runoff = 0.07 cfs @ 12.26 hrs, Volume= 0.006 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 12,324 61 >75% Grass cover, Good, HSG B 12,324 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 17 0.3500 0.35 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 10.7 126 0.0300 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.2 65 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 11.7 208 Total Subcatchment S-23: (Existing S-4) Hydrograph 0.075 C'Runoff 0.07- I()Ards 0.065 MSE 24-hr 3 0.06 2-Year Rainfall=2.80" 0.055- Runoff Area=12,324 sf 0.05 0.045 Runoff Volume=0.006 af 0.04 Runoff Depth>0.27" 0 0.035 Flow Length=208' r,- 0.03 0.03 Tc=11.7 min 0.025 C N=61 0.015 0.01 0.005= 0" 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment S-24: (Existing S-3) Runoff = 0.10 cfs @ 12.20 hrs, Volume= 0.008 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 15,370 61 >75% Grass cover, Good, HSG B 15,370 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 88 0.0340 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-24: (Existing S-3) Hydrograph 0.11=/ Runoff 0.105= o.rocrs I = MSE 24-hr 3 0.095 009= 2-Year Rainfall=2.80" 0.085= 06= Runoff Area=15,370 sf 0.075 0.07_ Runoff Volume=0.008 af 0.065= 0.06_ Runoff Depth>0.27" 0.055'_ LL 0.05= Flow Length=88' 0.045_ 0.04a Slope=0.0340 '/' 0.035 0.03 Tc=7.6 min 0.025 CN=61 0.02 0.015 0.01 0.005 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment S-25: East Runoff = 0.21 cfs @ 12.16 hrs, Volume= 0.014 af, Depth> 0.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.80" Area (sf) CN Description 26,951 61 >75% Grass cover, Good, HSG B 26,951 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.5 88 0.1250 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.5 77 0.0260 2.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.0 165 Total Subcatchment S-25: East Hydrograph L Runoff 0.22_ I0.2i�I 0.211 MSE 24-hr 3 0.2 0.19. 2-Year Rainfall=2.80" 0.16 0.177] Runoff Area=26,951 sf 0.16= 0.15y Runoff Volume=0.014 af 0.14 0.13' Runoff Depth>0.27" 0.125 0 0.11- Flow Length=165' 0.1- 0.09� Tc=5.0 min 0.06_ 0.07; CN=61 0.06' - 0.04 0.03-1 0.02-1 0.01 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 12 Summary for Reach R-1 : South Off-Site Inflow Area = 0.331 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.08 cfs @ 12.25 hrs, Volume= 0.007 af Outflow = 0.08 cfs @ 12.25 hrs, Volume= 0.007 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-1: South Off-Site Hydrograph D Inflow 0.09_ I ooe crs I L Outflow` 0085: I°.°8cfs I Inflow Area=0.331 ac 0.08 0.075;751 0.65= 0.065- 4- .065u 0.05 • 0.045 '. • 0.04 0.035 j 0.03' 0.025 ss. 0.02 0.015 0.01 0.005 0 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 13 Summary for Reach R-2: East Off-site Inflow Area = 0.619 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.21 cfs @ 12.16 hrs, Volume= 0.014 af Outflow = 0.21 cfs @ 12.16 hrs, Volume= 0.014 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-2: East Off-site Hydrograph / ❑ Inflow 0.23= I 0z1 cfs I L Outflow 0.22i 021ds Inflow Area=0.619 ac 0.21= 0.2' 0.191 0.18= 0.17= 0.16. 0.15= 0.14-1 Ul v 0.13 3 0.12'_ 0 0.11 LL 0.11 0.08 0.07 0.06 0.05 0.04 0.03 0.02 /11 rrWed, 5f,Aa/ - 0.01 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 14 Summary for Reach R-3: NE On-site Inflow Area = 0.353 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.10 cfs @ 12.20 hrs, Volume= 0.008 of Outflow = 0.10 cfs @ 12.20 hrs, Volume= 0.008 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-3: NE On-site Hydrograph / ❑Inflow 0.111 I elects I ❑Outflow 0105= I°'°o Inflow Area=0.353 ac 0.1 0.095 0.09 0.085 0.08 0.0751 0.65= --j)-0.0651 "C), 0.06-'_ g 0.055-'- LL 0.05= 0.045= 0.04 0.035 0.03-' 0.025 0.02 0.0150.01 0.005 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 15 Summary for Reach R-4: North Off-site Inflow Area = 0.283 ac, 0.00% Impervious, Inflow Depth > 0.27" for 2-Year event Inflow = 0.07 cfs @ 12.26 hrs, Volume= 0.006 af Outflow = 0.07 cfs @ 12.26 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-4: North Off-site Hydrograph ❑Inflow 0.0757 u Outflow = Inflow Area=0.283 ac 0.065= 0.06= '� 0.055= i 0.05 0.045 N 0 0.035- LL 0.03 0.025= 0.02= 0.015= 0.01 0.005j.' 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 16 Summary for Reach R-5: Road Off-site Inflow Area = 0.122 ac, 2.08% Impervious, Inflow Depth > 0.30" for 2-Year event Inflow = 0.06 cfs @ 12.11 hrs, Volume= 0.003 af Outflow = 0.06 cfs @ 12.11 hrs, Volume= 0.003 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-5: Road Off-site Hydrograph 0 ID Inflow .065-/ 0.01 del [I Outflow 0.06: L°°v Inflow Area=0.122 ac 0.055- 0.05- 0.045- 0.04- 0.035- 0.O3- U- 0.025 0.02- 0.015- 0.01- 0.005 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 17 Summary for Pond P-1 : Pond Inflow Area = 0.901 ac, 51.72% Impervious, Inflow Depth > 1.05" for 2-Year event Inflow = 1.73 cfs @ 12.15 hrs, Volume= 0.079 af Outflow = 0.01 cfs © 20.00 hrs, Volume= 0.007 af, Atten= 99%, Lag= 471.2 min Discarded = 0.01 cfs @ 20.00 hrs, Volume= 0.007 af Primary = 0.00 cfs © 5.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 901.00' @ 20.00 hrs Surf.Area= 2,716 sf Storage= 3,122 cf Plug-Flow detention time=271.8 min calculated for 0.007 af(9% of inflow) Center-of-Mass det. time= 184.5 min ( 979.8 - 795.3 ) Volume Invert Avail.Storage Storage Description #1 899.50' 24,192 cf Custom Stage Data (Conic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 899.50 1,598 0 0 1,598 900.00 1,842 859 859 1,853 901.00 2,717 2,265 3,125 2,744 901.30 2,946 849 3,974 2,980 902.00 3,684 2,316 6,290 3,731 903.00 5,202 4,421 10,711 5,268 904.00 6,638 5,905 16,616 6,729 905.00 8,554 7,576 24,192 8,670 Device Routing Invert Outlet Devices #1 Primary 901.30' 12.0" Round Culvert L= 215.0' RCP, end-section conforming to fill, Ke= 0.500 Inlet/ Outlet Invert= 901.30'/ 899.47' S= 0.0085 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 899.50' 0.450 in/hr Exfiltration over Wetted area above 899.50' Excluded Wetted area = 1,598 sf Discarded OutFlow Max=0.01 cfs @ 20.00 hrs HW=901.00' (Free Discharge) L2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs © 5.00 hrs HW=899.50' (Free Discharge) 4-1=Culvert ( Controls 0.00 cfs) 15265 proposed MSE 24-hr 3 2-Year Rainfall=2.80" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 18 Pond P-1: Pond Hydrograph El Inflow i 1.73 cfs Outflow Inflow Area=0.901 ac PrimaryDiscarded Peak EIev=901 .00' Storage=3,122 cf � 1 / ____.._— _,__.,__.,_____,—;_ -- 0.01 cfs Or C/4 r i/rArril o /////�/ 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment S-20: West to Road Runoff = 0.23 cfs @ 12.10 hrs, Volume= 0.009 af, Depth> 0.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 5,190 61 >75% Grass cover, Good, HSG B 110 98 Paved parking, HSG B 5,300 62 Weighted Average 5,190 97.92% Pervious Area 110 2.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.5 30 0.0670 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-20: West to Road Hydrograph 0.26;/ Runoff 0.25 0.24= 1023 cra1 0.23= MSE 24-hr 3 0.22= 002- 10-Year Rainfall=4.16" 0:;8= Runoff Area=5,300 sf 0.16a Runoff Volume=0.009 af 0.15: u 0.,4. Runoff Depth>0.89" 0.13 0 0.12° Flow Length=30' LL 0.11- 009= Slope=0.0670 '/' 0.08_ 0.07= Tc=2.5 min 0.06 0.05 C N=62 0.04 0.03 /6 0.02 0.01 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment S-21: Building & Lot Runoff = 3.42 cfs @ 12.14 hrs, Volume= 0.156 af, Depth> 2.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 18,950 61 >75% Grass cover, Good, HSG B 20,301 98 Paved parking, HSG B 39,251 80 Weighted Average 18,950 48.28% Pervious Area 20,301 51.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 33 0.1800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 5.1 83 0.0843 0.27 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 6.9 116 Total Subcatchment S-21: Building & Lot Hydrograph Runoff l 3.42 cfs I MSE 24-hr 3 3 10-Year Rainfall=4.16" Runoff Area=39,251 sf Runoff Volume=0.156 af 2 Runoff Depth>2.08" Flow Length=116' Tc=6.9 m i n CN=80 10 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment S-22: South of Building Runoff = 0.39 cfs @ 12.21 hrs, Volume= 0.023 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 14,410 61 >75% Grass cover, Good, HSG B 14,410 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 150 0.0533 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 120 0.0167 1.94 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.8 270 Total Subcatchment S-22: South of Building Hydrograph 0.42= ❑Runoff 0.4= 1 0.39 c s 0.38. MSE 24-hr 3 0.36 0.34= 10-Year Rainfall=4.16" 0.32 03= Runoff Area=14,410 sf 028= Runoff Volume=0.023 af 0.26 3 0.22- Runoff Depth>0.84" 0.2' Flow Length=270' 0.18= 0.16 Tc=10.8 min 0.14 0.12 CN=61 0.1 0.08 0.06 0.04 0.02 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment S-23: (Existing S-4) Runoff = 0.32 cfs @ 12.22 hrs, Volume= 0.020 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 12,324 61 >75% Grass cover, Good, HSG B 12,324 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 17 0.3500 0.35 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 10.7 126 0.0300 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.2 65 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 11.7 208 Total Subcatchment S-23: (Existing S-4) Hydrograph Runoff 0.34= to.az a. 0.32= MSE 24-hr 3 0.3= °.28= 10-Year Rainfall=4.16" 0.26 Runoff Area=12,324 sf 0.247 0.22= Runoff Volume=0.020 af Runoff Depth>0.84" 0.18] LL 0.16= Flow Length=208' 014- Tc=11.7 min 0.12 0.1 CN=61 0.08 0.06 0.04 0.02 0 //// 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment S-24: (Existing S-3) Runoff = 0.48 cfs @ 12.16 hrs, Volume= 0.025 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 15,370 61 >75% Grass cover, Good, HSG B 15,370 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 88 0.0340 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-24: (Existing S-3) Hydrograph C.Runoff 0.5- 1 0.48 cfs MSE 24-hr 3 0.45- 10-Year Rainfall=4.16" 0.4: 4 Runoff Area=15,370 sf 0.35= Runoff Volume=0.025 af F. 0.3i Runoff Depth>0.84" LL 0.25- Flow Length=88' 0.21 Slope=0.0340 '/' 0.15 Tc=7.6 m i n CN=61 0.05- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment S-25: East Runoff = 0.94 cfs @ 12.13 hrs, Volume= 0.043 af, Depth> 0.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.16" Area (sf) CN Description 26,951 61 >75% Grass cover, Good, HSG B 26,951 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.5 88 0.1250 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.5 77 0.0260 2.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.0 165 Total Subcatchment S-25: East Hydrograph `i Runoff 1 10.9r d8 1 MSE 24-hr 3 10-Year Rainfall=4.16" Runoff Area=26,951 sf Runoff Volume=0.043 af Runoff Depth>0.84" 0 Flow Length=165' Tc=5.0 m i n CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 25 Summary for Reach R-1: South Off-Site Inflow Area = 0.331 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.39 cfs @ 12.21 hrs, Volume= 0.023 af Outflow = 0.39 cfs @ 12.21 hrs, Volume= 0.023 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-1: South Off-Site Hydrograph / a Inflow 0.42: 0.39 da I ❑Outflow 04= 039 deInflow Area=0.331 ac 0.38-'_ 0.36 0.34- 0.321 0.3 0.28 0.26' 0.24i. 0.22 0 0.2' 0.18- 0.16 0.14 0.12 0.1 0.08 0.06 "F" ���� 0.04 %y����������������������� 0.02 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 26 Summary for Reach R-2: East Off-site Inflow Area = 0.619 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.94 cfs @ 12.13 hrs, Volume= 0.043 af Outflow = 0.94 cfs @ 12.13 hrs, Volume= 0.043 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-2: East Off-site Hydrograph / ❑Inflow C Outflow1 ` ccFlri Inflow Area=0.619 ac N /I u i i 0 I 'Y 0 r', , . . .. �. . , . �. . . . �. .. . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 27 Summary for Reach R-3: NE On-site Inflow Area = 0.353 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.48 cfs @ 12.16 hrs, Volume= 0.025 af Outflow = 0.48 cfs @ 12.16 hrs, Volume= 0.025 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-3: NE On-site Hydrograph / ❑ Inflow I 0.48 ds I E Outflow 05= '°.'8i° Inflow Area=0.353 ac 0.45- 0.4- 0.35- 0.3- u - 0.25 LL 0.15- 0.05- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 28 Summary for Reach R-4: North Off-site Inflow Area = 0.283 ac, 0.00% Impervious, Inflow Depth > 0.84" for 10-Year event Inflow = 0.32 cfs @ 12.22 hrs, Volume= 0.020 af Outflow = 0.32 cfs @ 12.22 hrs, Volume= 0.020 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-4: North Off-site Hydrograph / ❑ Inflow 10.32 cfs I Outflow 0.34_ I0.32ds Inflow Area=0.283 ac 0.32 0.3= 0.28 0.26 0.24 ii 02 H 0.0.2- o 3 0.o 18= — 0.16= u. 0.141 0.12 0.1 0.08 0.06 0.04 0.02 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 29 Summary for Reach R-5: Road Off-site Inflow Area = 0.122 ac, 2.08% Impervious, Inflow Depth > 0.89" for 10-Year event Inflow = 0.23 cfs @ 12.10 hrs, Volume= 0.009 af Outflow = 0.23 cfs @ 12.10 hrs, Volume= 0.009 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-5: Road Off-site Hydrograph 0.26 / ❑Inflow 0.23 cis I 0 Outflow 0.24. I0.23ds Inflow Area=0.122 ac 0.22= 0.18-] 0.16- u 0.14- 0 0.12- LL 0.17 0.08j , 0.067 ► A 0.04- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 30 Summary for Pond P-1: Pond Inflow Area = 0.901 ac, 51.72% Impervious, Inflow Depth > 2.08" for 10-Year event Inflow = 3.42 cfs @ 12.14 hrs, Volume= 0.156 af Outflow = 0.23 cfs @ 13.30 hrs, Volume= 0.060 af, Atten= 93%, Lag= 69.6 min Discarded = 0.02 cfs @ 13.30 hrs, Volume= 0.010 af Primary = 0.21 cfs © 13.30 hrs, Volume= 0.050 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 901.52' @ 13.30 hrs Surf.Area= 3,172 sf Storage= 4,656 cf Plug-Flow detention time= 192.1 min calculated for 0.060 af (38% of inflow) Center-of-Mass det. time= 124.4 min ( 908.4 - 784.0 ) Volume Invert Avail.Storage Storage Description #1 899.50' 24,192 cf Custom Stage Data (Conic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 899.50 1,598 0 0 1,598 900.00 1,842 859 859 1,853 901.00 2,717 2,265 3,125 2,744 901.30 2,946 849 3,974 2,980 902.00 3,684 2,316 6,290 3,731 903.00 5,202 4,421 10,711 5,268 904.00 6,638 5,905 16,616 6,729 905.00 8,554 7,576 24,192 8,670 Device Routing Invert Outlet Devices #1 Primary 901.30' 12.0" Round Culvert L= 215.0' RCP, end-section conforming to fill, Ke= 0.500 Inlet/ Outlet Invert= 901.30'/ 899.47' S= 0.0085 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 899.50' 0.450 in/hr Exfiltration over Wetted area above 899.50' Excluded Wetted area = 1,598 sf Discarded OutFlow Max=0.02 cfs @ 13.30 hrs HW=901.52' (Free Discharge) t-2=Exfiltration (Exfiltration Controls 0.02 cfs) Primary OutFlow Max=0.21 cfs @ 13.30 hrs HW=901.52' (Free Discharge) t-1=Culvert (Inlet Controls 0.21 cfs @ 1.61 fps) 15265 proposed MSE 24-hr 3 10-Year Rainfall=4.16" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 31 Pond P-1: Pond Hydrograph I ❑ Inflow 3.42 cfs I Outflow Inflow Area=0.901 ac Prmaryed Peak Elev=901 .52' 3 Storage=4,656 cf I 22 II O I LL 0.23 cfs /// �l% � 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 32 Summary for Subcatchment S-20: West to Road Runoff = 0.76 cfs @ 12.09 hrs, Volume= 0.028 af, Depth> 2.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 5,190 61 >75% Grass cover, Good, HSG B 110 98 Paved parking, HSG B 5,300 62 Weighted Average 5,190 97.92% Pervious Area 110 2.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.5 30 0.0670 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-20: West to Road Hydrograph Runoff 10.78 ds I 0.75: MSE 24-hr 3 065: 100-Year Rainfall=7.20" 0.6= Runoff Area=5,300 sf 0.55_ Runoff Volume=0.028 af ,.. 0.5 0.45= Runoff Depth>2.81" • 0.4= Flow Length=30' u 0.35_ 0.3. Slope=0.0670 '/' 0.25: Tc=2.5 min 02- C 0.15= N=62 0.1 0.05_ 0"/ /77 �® 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 33 Summary for Subcatchment S-21: Building & Lot Runoff = 7.45 cfs @ 12.14 hrs, Volume= 0.353 af, Depth> 4.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 18,950 61 >75% Grass cover, Good, HSG B 20,301 98 Paved parking, HSG B 39,251 80 Weighted Average 18,950 48.28% Pervious Area 20,301 51.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 33 0.1800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 5.1 83 0.0843 0.27 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 6.9 116 Total Subcatchment S-21 : Building & Lot Hydrograph / L Runoff 8- r7.45 ds I MSE 24-hr 3 100-Year Rainfall=7.20" 6= Runoff Area=39,251 sf 5- Runoff Volume=0.353 af Runoff Depth>4.70" o 4- Flow Length=116' LL 3- Tc=6.9 min CN=80 2- 1 0 %////////%/i%///Z/Z.72.�/- 5 6 7 8 9 10 11 12 13 T 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment S-22: South of Building Runoff = 1.39 cfs @ 12.19 hrs, Volume= 0.075 af, Depth> 2.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 14,410 61 >75% Grass cover, Good, HSG B 14,410 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 150 0.0533 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 1.0 120 0.0167 1.94 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 10.8 270 Total Subcatchment S-22: South of Building Hydrograph G Runoff 11.39 els I MSE 24-hr 3 100-Year Rainfall=7.20" Runoff Area=14,410 sf 1 Runoff Volume=0.075 af Runoff Depth>2.70" Flow Length=270' Tc=10.8 min CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment S-23: (Existing S-4) Runoff = 1.15 cfs @ 12.20 hrs, Volume= 0.064 af, Depth> 2.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 12,324 61 >75% Grass cover, Good, HSG B 12,324 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 17 0.3500 0.35 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 10.7 126 0.0300 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.2 65 0.1200 5.20 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 11.7 208 Total Subcatchment S-23: (Existing S-4) Hydrograph Runoff 1.15 ds MSE 24-hr 3 1 100-Year Rainfall=7.20" Runoff Area=12,324 sf Runoff Volume=0.064 af Runoff Depth>2.70" 0 Flow Length=208' Tc=11.7 min CN=61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 36 Summary for Subcatchment S-24: (Existing S-3) Runoff = 1.69 cfs @ 12.15 hrs, Volume= 0.080 af, Depth> 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 15,370 61 >75% Grass cover, Good, HSG B 15,370 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 88 0.0340 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" Subcatchment S-24: (Existing S-3) Hydrograph Runoff 11.69 cfs MSE 24-hr 3 100-Year Rainfall=7.20" Runoff Area=15,370 sf Runoff Volume=0.080 af Runoff Depth>2.71" Flow Length=88' Slope=0.0340 '/' Tc=7.6 m i n CN=61 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 37 Summary for Subcatchment S-25: East Runoff = 3.24 cfs @ 12.12 hrs, Volume= 0.140 af, Depth> 2.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.20" Area (sf) CN Description 26,951 61 >75% Grass cover, Good, HSG B 26,951 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.5 88 0.1250 0.32 Sheet Flow, Grass: Short n= 0.150 P2= 2.81" 0.5 77 0.0260 2.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 5.0 165 Total Subcatchment S-25: East Hydrograph Runoff 13.24 d6 I MSE 24-hr 3 3 100-Year Rainfall=7.20" Runoff Area=26,951 sf Runoff Volume=0.140 af 12 2 Runoff Depth>2.71" 0 Flow Length=165' Tc=5.0 min CN=61 �111�11���1»l»»lllri�� 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 38 Summary for Reach R-1: South Off-Site Inflow Area = 0.331 ac, 0.00% Impervious, Inflow Depth > 2.70" for 100-Year event Inflow = 1.39 cfs @ 12.19 hrs, Volume= 0.075 af Outflow = 1.39 cfs @ 12.19 hrs, Volume= 0.075 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-1: South Off-Site Hydrograph / ❑ Inflow 17.39 cis I E Outflow I139c Inflow Area=0.331 ac N U 0 O LL 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 39 Summary for Reach R-2: East Off-site Inflow Area = 0.619 ac, 0.00% Impervious, Inflow Depth > 2.71" for 100-Year event Inflow = 3.24 cfs @ 12.12 hrs, Volume= 0.140 of Outflow = 3.24 cfs @ 12.12 hrs, Volume= 0.140 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-2: East Off-site Hydrograph ❑Inflow II 13.24cfs I ❑Outflow 324 ds Inflow Area=0.619 ac 3 n 2 3 0 LL 1 r 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 40 Summary for Reach R-3: NE On-site Inflow Area = 0.353 ac, 0.00% Impervious, Inflow Depth > 2.71" for 100-Year event Inflow = 1.69 cfs @ 12.15 hrs, Volume= 0.080 af Outflow = 1.69 cfs @ 12.15 hrs, Volume= 0.080 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-3: NE On-site Hydrograph / ❑ Inflow lis?ctsI L Outflow 1 1 .69`s Inflow Area=0.353 ac 1 0 LL 1 A4. 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 41 Summary for Reach R-4: North Off-site Inflow Area = 0.283 ac, 0.00% Impervious, Inflow Depth > 2.70" for 100-Year event Inflow = 1.15 cfs @ 12.20 hrs, Volume= 0.064 af Outflow = 1.15 cfs @ 12.20 hrs, Volume= 0.064 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-4: North Off-site Hydrograph / 0 Inflow 11.15ds I v Outflow 11.15(48- Inflow Area=0.283 ac 2 LL I)1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 42 Summary for Reach R-5: Road Off-site Inflow Area = 0.122 ac, 2.08% Impervious, Inflow Depth > 2.81" for 100-Year event Inflow = 0.76 cfs @ 12.09 hrs, Volume= 0.028 af Outflow = 0.76 cfs @ 12.09 hrs, Volume= 0.028 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach R-5: Road Off-site Hydrograph 0.857/ ❑ Inflow I o7s crs I [1]Outflow °.8 °'6cfs'r' Inflow Area=0.122 ac 0.75 0.7. 0.65 0.6= 0.55_ I 0.5 0.45= c 0.4_ u 0.35= 0.3 0.25 j 0.2 t/ 0.15 ,.�/AV' 0.1 0.05 ,�I//f 0 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 43 Summary for Pond P-1 : Pond Inflow Area = 0.901 ac, 51.72% Impervious, Inflow Depth > 4.70" for 100-Year event Inflow = 7.45 cfs © 12.14 hrs, Volume= 0.353 af Outflow = 2.66 cfs @ 12.31 hrs, Volume= 0.254 af, Atten= 64%, Lag= 10.0 min Discarded = 0.03 cfs @ 12.31 hrs, Volume= 0.012 af Primary = 2.63 cfs © 12.31 hrs, Volume= 0.242 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 902.28' @ 12.31 hrs Surf.Area= 4,085 sf Storage= 7,384 cf Plug-Flow detention time= 101.6 min calculated for 0.254 af(72% of inflow) Center-of-Mass det. time= 50.2 min ( 820.7 - 770.5 ) Volume Invert Avail.Storage Storage Description #1 899.50' 24,192 cf Custom Stage Data (Conic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 899.50 1,598 0 0 1,598 900.00 1,842 859 859 1,853 901.00 2,717 2,265 3,125 2,744 901.30 2,946 849 3,974 2,980 902.00 3,684 2,316 6,290 3,731 903.00 5,202 4,421 10,711 5,268 904.00 6,638 5,905 16,616 6,729 905.00 8,554 7,576 24,192 8,670 Device Routing Invert Outlet Devices #1 Primary 901.30' 12.0" Round Culvert L= 215.0' RCP, end-section conforming to fill, Ke= 0.500 Inlet/ Outlet Invert= 901.30'/ 899.47' S= 0.0085 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 899.50' 0.450 in/hr Exfiltration over Wetted area above 899.50' Excluded Wetted area = 1,598 sf Discarded OutFlow Max=0.03 cfs © 12.31 hrs HW=902.28' (Free Discharge) L2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=2.63 cfs © 12.31 hrs HW=902.28' (Free Discharge) L1=Culvert (Inlet Controls 2.63 cfs @ 3.37 fps) 15265 proposed MSE 24-hr 3 100-Year Rainfall=7.20" Prepared by Microsoft Printed 4/3/2019 HydroCAD® 10.00-24 s/n 01626 ©2018 HydroCAD Software Solutions LLC Page 44 Pond P-1: Pond Hydrograph ❑ Inflow zas cfs Outflow Inflow Area=0.901 ac °DiscardPrimaryed 8- Peak Elev=902.28' Storage=7,384 cf 6_ I, 0 5- u 0 4 2.66 cfs 32.63 cfs 2- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) I nccnnn AVENUE O ?TN I-J --- /-14 14059'1�14318 o ss � • y z G3 70 _4 IC , ABTA Ig AT \\ �� Iii II ! 1, AI\)A\ r ht vii mil r u' e . A °sr ## � 1 °� TOPPIet !!!Wti! (( , !1;!!1 /2 -e4 4 Nies w v z 1 01 Ptip CC T 26'1 \\ AS/ �_ _ � { ii;10 1 sr, tey ea £a 8 - i 0 00 0 O 0000 A _ m gigs e,9 ag 4 x -. og l .4 1X011R1 Ori7.4V . ;31 ;q T g 1 1 11 / 11 € gg. ggigg32Agg m ° f➢Alt "ik 6g "74I ; R -ioi > i i- €f @@ . 1x . s3. ; 11t€.11. i3 { ! I:1! FaglIA gl I l a ii! I; ; t / ° fi A a Ri t l id ; ; 1 , M:l i - g �"' Z �., R T ; � g m � q€ 1a RP ;4 m /11 ;> I^41 I 08. 1,145; Z A; i i` a4 c € R ! _ i i : 9 ?� S A 'fi m a R s 1g �� E. gs51g g. .1sw i 3 It f. ;6 /A o At H °lGI atI I V I I I ,6 a 11 ;i= � 88 00 Z pI ° 11 Him ! Hg x 11 a ^ -Ell s I C7 50 G : '! 1Jij o c; a o n $ EXHIBIT E Soil Map—Washington County,Minnesota .',,Y. 5,5'9: 515226 515:7, 5191: 90 5,9% 5,9515Qr t.,-,5,-..I 1 F ^� s...� -.• -3fi - 5 i c}r:.y >< tee: -- — ) .. ,. . I • • _,/ _ . . , ,...,.. 8f,1( Sr -,- •":4,, C ' 1 .r' 1 r- i syr , t t 49101 St Nr I 1 ,38 r , t - s` j R • 515010 515110 515150 515150 515720 515770 51531 515050 5,1/411 51541 515x^ 3 i nap sok-1:2,060N prtrtrd an A landsape(11'x 8-5')Meet Meters It N 0 30 CO 131 160 A � Feet 0 100 200 aN 610 Ing 1:Wm nettc toner aaordrots:WG584 Edge tics tRM Zane 15N wG581 �1�ag Natural Resources Web Soil Survey 3/11/2019 Conservation Service National Cooperative Soil Survey Page 1 of 3 Soil Map—Washington County,Minnesota MAP LEGEND MAP INFORMATION Area of Interest(A01) u Spoil Area The soil surveys that comprise your AOI were mapped at El Area of Interest(AOI) StonySpot 1:15,800. Soils 42 very Stony Spot Warning:Soil Map may not be valid at this scale. Li Soil Map Unit Polygons p Wet Spot Enlargement of maps beyond the scale of mapping can cause sot Map Unu Lines misunderstanding of the detail of mapping and accuracy of soil is Other line placement.The maps do not show the small areas of 13 Soil Map Ung Points contrasting soils that could have been shown at a more detailed Special Point Features • Special Line Features scale. V Blowout Water Features Streams and Canals Please rely on the bar scale on each map sheet for map ® Borrow Pot measurements. Transportation X Clay Spot Rails Source of Map: Natural Resources Conservation Service Closed Depression Web Soil Survey URL: ti Interstate highways Coordinate System: Web Mercator(EPSG:3857) X Gravel Pit US Routes Maps from the Web Soil Survey are based on the Web Mercator Gravelly Spot Major Roads projection,which preserves direction and shape but distorts distance and area.A projection that preserves area,such as the • Lendlift Local Roads Albers equal-area conic projection,should be used if more Lava Flow accurate calculations of distance or area are required.Background 4!..„ Marsh or swamp ■ Aerial Photography This product is generated from the USDA-NRCS certified data as of the version date(s)listed below. • Mine or Quarry Soil Survey Area: Washington County,Minnesota C Mlscelleneous Water Survey Area Data: Version 14,Oct 9,2018 Q Perennial Water Soil mep units are labeled(es space allows)for map scales Rock Outcrop 1.50,000 or larger. + Saline Spot Date(s)aerial images were photographed: Oct 4,2010—Jun 6, 2016 Sandy Spot • The orthophoto or other base map on which the soil lines were p Severely Eroded Spot compiled end digitized probebly differs from the background imagery displayed on these maps.As a result,some minor Slnkhoie shifting of map unit boundaries may be evident. Slide or Slip • Sock Spot UStM Natural Resources Web Soil Survey 3/11/2019 1400 Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map—Washington County,Minnesota Map Unit Legend Map Unit Symbol Map Unit Name Acres In AOI Percent of AOI 1538 Santiago silt loam,2 to 6 7.3 40.8% percent slopes 155B Chetek sandy loam,0 to 6 0.7 3 7% percent slopes 155D Chetek sandy loam,12 to 25 1.0 5.7% percent slopes 858C Urban land-Chetek complex.3 1.1 6.3% to 15 percent slopes 861C Urban land-Kingsley complex. 4.4 24.4% 3 to 15 percent slopes 8960 Mahtomedi-Kingsley complex. 1.7 9.4% 12 to 25 percent slopes 1029 Pits,gravel 0.6 3.5% 1039 Urban land 1.1 6.2% Totals for Area of Interest 17.8 100.0% Natural Resources Web Soil Survey 3/11/2019 Conservation Service National Cooperative Soil Survey Page 3 of 3 Map Unit Description:Santiago silt loam,2 to 6 percent slopes--Washington County, Minnesota Washington County, Minnesota 153B—Santiago silt loam, 2 to 6 percent slopes Map Unit Setting National map unit symbol: 1t93t Mean annual precipitation: 27 to 33 inches Mean annual air temperature: 39 to 46 degrees F Frost-free period: 135 to 180 days Farmland classification: All areas are prime farmland Map Unit Composition Santiago and similar soils: 90 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Santiago Setting Landform: Moraines Landform position (two-dimensional): Backslope Down-slope shape: Linear Across-slope shape: Linear Parent material: Loess over till Typical profile Ap - 0 to 7 inches: silt loam E- 7 to 10 inches: silt loam Bt- 10 to 25 inches: silt loam 2Bt- 25 to 40 inches: sandy loam 2C -40 to 60 inches: sandy loam Properties and qualities Slope: 2 to 6 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Capacity of the most limiting layer to transmit water(Ksat): Moderately low to moderately high (0.14 to 0.57 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: High (about 10.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Forage suitability group: Sloping Upland, Acid (G090XN006MN) Hydric soil rating: No USDA Natural Resources Web Soil Survey 3/11/2019 'II" Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description:Santiago silt loam,2 to 6 percent slopes—Washington County, Minnesota Minor Components Freeon Percent of map unit: 5 percent Hydric soil rating: No Kingsley Percent of map unit: 5 percent Hydric soil rating: No Data Source Information Soil Survey Area: Washington County, Minnesota Survey Area Data: Version 14, Oct 9, 2018 USDA Natural Resources Web Soil Survey 3/11/2019 r"ll. Conservation Service National Cooperative Soil Survey Page 2 of 2