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HomeMy WebLinkAbout2016-05-10 Westwood - Drainage Map & Calculations 7699 Anagram Drive Eden Prairie,MN 55344 Westwood Main (952)937-5150 Fax (952)937-5822 westwoodps.com (888)937-5150 MEMORANDUM Date: May 10, 2016 Re: Furniture Warehouse—Oak Park Heights Drainage Map and Calculations File 000413.03 To: Alex Young, MSP Commercial From: Shari Ahrens In conjunction with the site plan, a drainage map and calculations have been completed for the site plan review of the proposed Furniture Warehouse in the City of Oak Park Heights. The site was modeled in HydroCAD, utilizing Atlas 14 rainfall depths. It is our understanding that a regional pond located to the south satisfies the City and Watershed storm water requirements for this development. Onsite BMP's will consist of grass swales and ditch drainage pre-treatment devices (Rain Guardians) to provide additional pre-treatment for runoff from the site. The proposed site will consist of a 20,428 s.f. warehouse with associated parking and landscape areas. The future 7,866 s.f building and parking expansion areas are also incorporated in the drainage design. The site is divided into two drainage areas with a portion of the site's stormwater runoff flowing northwest, discharging into the eastern Memorial Ave ditch(DA- S5). The remainder of the site's stormwater runoff will flow southeast and discharge into an existing swale (DA- S3). In addition to this project site, the adjacent developments are included in this drainage analysis to properly size the culvert and drainage swales. The proposed culvert under the proposed drive way along Memorial Ave. was sized to accommodate future development area northeast of the project site (DA-S8). The calculated flow for a 100- year event is 15.6 cfs. The proposed 21"RCP culvert at 1% has capacity for this flow. The existing swale has a 6 to 9 foot ditch bottom and 6:1 side slopes. Assuming a Manning's n=0.035 the depth of flow in the ditch is approximately 0.73 feet or 9 inches. Enclosures; Proposed Conditions Drainage Area Map Proposed Conditions HydroCAD report RECEIVED MAY 1 12016 Multi-Disciplined Surveying&Engineering westwoodps.com *2015 Westwood P4o6nniead Smokes.Inc ..v ., * �,j...,- ,` , - `� ' 1.411111 .,,, . 04... -\\\> V _ de..': ,„,./, ' "--...S.:',....--,,,,,,..,... \ j / x f : / L. 7,. • , , 44, .,,, . ... \ ' • l 0 • 0' ° ,g v I f ::7__1,_,,„.::::„..._. / 4:\ / j' N.. i• ,4 i N, 1 :e4er f , } J / ,L, . , ' A/1 ' ' '• \ ' 441/4***,,.,N: . ' 0 I , ,, '. ' / li ,/ rf ft .,, ,, ,,,J . / ......,.. .., .. . . . . ,......„. ...„ , ' 4 .„, 9 ,, .. .,, . i ., . //„ . .,, ., , ,/,/,/,/,/ ft : ,.. , „ „„,,„ „,.. .. / , /,_, , ....... iiiiiiimiiii V 100 200' sheet 1 OF 1 jt 05/10/16 F WW\I11�000� �N '�'P�d Phone (952)937-5150 7699 Anagram Drive Reid, FaxTo8 (952)937-5822 Eden Prairie,MN 55344 Area AREHOUSE Td1Free (888)937-5150rW mn Draw INistod Prairmd S Inc Record Ocarina by/data Oak Pada' 1100441.3tirnn`)wn L6R 4 SS Prop Warehouse - NW Memorial Ave Ditch to Memorial Ave (f-3—S) adjacent parcel /future development 3S 1111) rop Furniture arehouse - SE to adjacent parcel /future Swale development E4R A 0 Ex Morning Dove Ave Existing Swale C-2—S-) Prop Pizza Ranch Development --- ----\_ Subca Reach 'on• Lin J Routing Diagram for 4413-Proposed Funiture Warehouse-16-05-10 ----N-- Prepared by Westwood Professional Services, Inc., Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 2 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Ex Morning Dove Ave Runoff Area=0.880 ac 79.55% Impervious Runoff Depth=2.06" Tc=7.0 min CN=93 Runoff=2.85 cfs 0.151 af Subcatchment 2S: Prop Pizza Ranch Runoff Area=1.001 ac 73.13% Impervious Runoff Depth=1.80" Tc=7.0 min CN=90 Runoff=2.86 cfs 0.150 af Subcatchment 3S: Prop Furniture Warehouse- Runoff Area=83.311 sf 67.77% Impervious Runoff Depth=1.80" Tc=7.0 min CN=90 Runoff=5.47 cfs 0.287 af Subcatchment 5S: Prop Warehouse-NW to Runoff Area=50.627 sf 40.17% Impervious Runoff Depth=1.35" Tc=15.0 min CN=84 Runoff=1.81 cfs 0.131 of Subcatchment 7S: adjacent parcel/future Runoff Area=55.687 sf 79.82% Impervious Runoff Depth=2.06" Tc=10.0 min CN=93 Runoff=3.60 cfs 0.220 af Subcatchment 8S: adjacent parcel/future Runoff Area=62.120 sf 80.10% Impervious Runoff Depth=2.06" Tc=15.0 min CN=93 Runoff=3.39 cfs 0.245 of Reach 4R: Existing Swale Avg. Flow Depth=0.42' Max Vel=2.81 fps Inflow=14.56 cfs 0.808 af n=0.035 L=321.0' S=0.0187'1 Capacity=296.50 cfs Outflow=13.39 cfs 0.808 af Reach 6R: Memorial Ave Ditch Avg. Flow Depth=0.27' Max Vel=1.71 fps Inflow=5.21 cfs 0.376 af n=0.030 L=178.0' S=0.0084'/' Capacity=240.24 cfs Outflow=5.06 cfs 0.376 af Total Runoff Area=7.660 ac Runoff Volume=1.185 af Average Runoff Depth=1.86" 30.06%Pervious=2.302 ac 69.94%Impervious=5.358 ac 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 1S: Ex Morning Dove Ave Runoff = 2.85 cfs @ 12.05 hrs, Volume= 0.151 af, Depth= 2.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Area (ac) CN Description * 0.700 98 pavement 0.180 74 >75% Grass cover, Good, HSG C 0.880 93 Weighted Average 0.180 20.45% Pervious Area 0.700 79.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 2S: Prop Pizza Ranch Development Runoff = 2.86 cfs @ 12.05 hrs, Volume= 0.150 af, Depth= 1.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Area (ac) CN Description * 0.732 98 parking and building * 0.269 69 green space and swale 1.001 90 Weighted Average 0.269 26.87% Pervious Area 0.732 73.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 3S: Prop Furniture Warehouse - SE to Swale Runoff = 5.47 cfs @ 12.05 hrs, Volume= 0.287 af, Depth= 1.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr 51 2-yr Rainfall=2.80" 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 4 Area (sf) CN Description * 28,871 98 building and future building * 2,477 98 truck dock * 25,114 98 pavement * 26,849 74 green space 83,311 90 Weighted Average 26,849 32.23% Pervious Area 56,462 67.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 5S: Prop Warehouse - NW to Memorial Ave Runoff = 1.81 cfs @ 12.17 hrs, Volume= 0.131 af, Depth= 1.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Area (sf) CN Description * 20,335 98 pavement * 1,704 74 green space in parking area * 28,588 74 Swale and Ditch Areas 50,627 84 Weighted Average 30,292 59.83% Pervious Area 20,335 40.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, 10 Summary for Subcatchment 7S: adjacent parcel /future development Runoff = 3.60 cfs @ 12.09 hrs, Volume= 0.220 af, Depth= 2.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr 51 2-yr Rainfall=2.80" Area (sf) CN Description * 44,450 98 future development impervious * 11,237 74 future development perivous 55,687 93 Weighted Average 11,237 20.18% Pervious Area 44,450 79.82% Impervious Area 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 5 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Summary for Subcatchment 8S: adjacent parcel /future development Runoff = 3.39 cfs @ 12.16 hrs, Volume= 0.245 af, Depth= 2.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Area (sf) CN Description 49,760 98 impervious area 12,360 74 pervious area 62,120 93 Weighted Average 12,360 19.90% Pervious Area 49,760 80.10% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, Summary for Reach 4R: Existing Swale Inflow Area = 5.072 ac, 73.91% Impervious, Inflow Depth = 1.91" for 2-yr event Inflow = 14.56 cfs @ 12.06 hrs, Volume= 0.808 af Outflow = 13.39 cfs @ 12.12 hrs, Volume= 0.808 af, Atten= 8%, Lag= 3.7 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 2.81 fps, Min. Travel Time= 1.9 min Avg. Velocity = 0.68 fps, Avg. Travel Time= 7.9 min Peak Storage= 1,571 cf @ 12.09 hrs Average Depth at Peak Storage= 0.42' Bank-Full Depth= 2.00' Flow Area=45.8 sf, Capacity= 296.50 cfs Custom cross-section, Length= 321.0' Slope= 0.0187'/' Constant n= 0.035 High grass Inlet Invert= 936.00', Outlet Invert= 930.00' 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr SI 2-yr Rainfall=2.80" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 6 Offset Elevation Chan.Depth (feet) (feet) (feet) 0.00 938.00 0.00 6.50 937.00 1.00 13.50 936.00 2.00 22.50 936.00 2.00 28.50 937.00 1.00 38.50 938.00 0.00 Depth End Area Perim. Storage Discharge (feet) (sq-ft) (feet) (cubic-feet) (cfs) 0.00 0.0 9.0 0 0.00 1.00 15.5 22.2 4,976 70.91 2.00 45.8 38.8 14,686 296.50 Summary for Reach 6R: Memorial Ave Ditch Inflow Area = 2.588 ac, 62.17% Impervious, Inflow Depth = 1.74" for 2-yr event Inflow = 5.21 cfs @ 12.16 hrs, Volume= 0.376 of Outflow = 5.06 cfs © 12.21 hrs, Volume= 0.376 af, Atten= 3%, Lag= 3.2 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 1.71 fps, Min. Travel Time= 1.7 min Avg. Velocity = 0.46 fps, Avg. Travel Time= 6.5 min Peak Storage= 531 cf @ 12.18 hrs Average Depth at Peak Storage= 0.27' Bank-Full Depth= 2.00' Flow Area= 45.0 sf, Capacity= 240.24 cfs Custom cross-section, Length= 178.0' Slope= 0.0084 'P Constant n= 0.030 Short grass Inlet Invert= 37.00', Outlet Invert= 35.50' Offset Elevation Chan.Depth (feet) (feet) (feet) 0.00 38.00 0.00 3.00 37.00 1.00 8.00 36.00 2.00 17.00 36.00 2.00 26.00 37.00 1.00 35.00 38.00 0.00 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 2-yr Rainfall=2.80" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 7 Depth End Area Perim. Storage Discharge (feet) (sq-ft) (feet) (cubic-feet) (cfs) 0.00 0.0 9.0 0 0.00 1.00 16.0 23.2 2,848 56.86 2.00 45.0 35.4 8,010 240.24 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 8 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Ex Morning Dove Ave Runoff Area=0.880 ac 79.55% Impervious Runoff Depth=3.39" Tc=7.0 min CN=93 Runoff=4.52 cfs 0.248 of Subcatchment 2S: Prop Pizza Ranch Runoff Area=1.001 ac 73.13% Impervious Runoff Depth=3.08" Tc=7.0 min CN=90 Runoff=4.78 cfs 0.257 af Subcatchment 3S: Prop Furniture Warehouse- Runoff Area=83.311 sf 67.77% Impervious Runoff Depth=3.08" Tc=7.0 min CN=90 Runoff=9.13 cfs 0.491 of Subcatchment 5S: Prop Warehouse-NW to Runoff Area=50.627 sf 40.17% Impervious Runoff Depth=2.52" Tc=15.0 min CN=84 Runoff=3.40 cfs 0.244 af Subcatchment 7S: adjacent parcel/future Runoff Area=55.687 sf 79.82% Impervious Runoff Depth=3.39" Tc=10.0 min CN=93 Runoff=5.73 cfs 0.361 of Subcatchment 8S: adjacent parcel/future Runoff Area=62.120 sf 80.10% Impervious Runoff Depth=3.39" Tc=15.0 min CN=93 Runoff=5.43 cfs 0.402 af Reach 4R: Existing Swale Avg. Flow Depth=0.55' Max VeI=3.27 fps Inflow=23.82 cfs 1.357 of n=0.035 L=321.0' S=0.0187'1 Capacity=296.50 cfs Outflow=22.07 cfs 1.357 af Reach 6R: Memorial Ave Ditch Avg. Flow Depth=0.37' Max Vel=2.03 fps Inflow=8.83 cfs 0.647 af n=0.030 L=178.0' S=0.0084'/' Capacity=240.24 cfs Outflow=8.60 cfs 0.647 of Total Runoff Area=7.660 ac Runoff Volume=2.003 af Average Runoff Depth=3.14" 30.06%Pervious=2.302 ac 69.94%Impervious=5.358 ac 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 1S: Ex Morning Dove Ave Runoff = 4.52 cfs @ 12.05 hrs, Volume= 0.248 af, Depth= 3.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 10-yr Rainfall=4.17' Area (ac) CN Description * 0.700 98 pavement 0.180 74 >75% Grass cover, Good, HSG C 0.880 93 Weighted Average 0.180 20.45% Pervious Area 0.700 79.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 2S: Prop Pizza Ranch Development Runoff = 4.78 cfs @ 12.05 hrs, Volume= 0.257 af, Depth= 3.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Area (ac) CN Description * 0.732 98 parking and building * 0.269 69 green space and swale 1.001 90 Weighted Average 0.269 26.87% Pervious Area 0.732 73.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 3S: Prop Furniture Warehouse - SE to Swale Runoff = 9.13 cfs @ 12.05 hrs, Volume= 0.491 af, Depth= 3.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 10 Area (sf) CN Description 28,871 98 building and future building 2,477 98 truck dock 25,114 98 pavement 26,849 74 green space 83,311 90 Weighted Average 26,849 32.23% Pervious Area 56,462 67.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 5S: Prop Warehouse - NW to Memorial Ave Runoff = 3.40 cfs @ 12.16 hrs, Volume= 0.244 af, Depth= 2.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Area (sf) CN Description 20,335 98 pavement 1,704 74 green space in parking area 28,588 74 Swale and Ditch Areas 50,627 84 Weighted Average 30,292 59.83% Pervious Area 20,335 40.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, 10 Summary for Subcatchment 7S: adjacent parcel /future development Runoff = 5.73 cfs @ 12.09 hrs, Volume= 0.361 af, Depth= 3.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Area (sf) CN Description 44,450 98 future development impervious 11,237 74 future development perivous 55,687 93 Weighted Average 11,237 20.18% Pervious Area 44,450 79.82% Impervious Area 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 11 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Summary for Subcatchment 8S: adjacent parcel /future development Runoff = 5.43 cfs @ 12.16 hrs, Volume= 0.402 af, Depth= 3.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr 51 10-yr Rainfall=4.17" Area (sf) CN Description 49,760 98 impervious area 12,360 74 pervious area 62,120 93 Weighted Average 12,360 19.90% Pervious Area 49,760 80.10% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, Summary for Reach 4R: Existing Swale Inflow Area = 5.072 ac, 73.91% Impervious, Inflow Depth = 3.21" for 10-yr event Inflow = 23.82 cfs @ 12.06 hrs, Volume= 1.357 af Outflow = 22.07 cfs @ 12.11 hrs, Volume= 1.357 af, Atten= 7%, Lag= 3.2 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 3.27 fps, Min. Travel Time= 1.6 min Avg. Velocity = 0.78 fps, Avg. Travel Time= 6.9 min Peak Storage= 2,216 cf @ 12.08 hrs Average Depth at Peak Storage= 0.55' Bank-Full Depth= 2.00' Flow Area= 45.8 sf, Capacity= 296.50 cfs Custom cross-section, Length= 321.0' Slope= 0.0187 '/' Constant n= 0.035 High grass Inlet Invert= 936.00', Outlet Invert= 930.00' 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 10-yr Rainfall=4.17" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD® 10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 12 Offset Elevation Chan.Depth (feet) (feet) (feet) 0.00 938.00 0.00 6.50 937.00 1.00 13.50 936.00 2.00 22.50 936.00 2.00 28.50 937.00 1.00 38.50 938.00 0.00 Depth End Area Perim. Storage Discharge (feet) (sq-ft) (feet) (cubic-feet) (cfs) 0.00 0.0 9.0 0 0.00 1.00 15.5 22.2 4,976 70.91 2.00 45.8 38.8 14,686 296.50 Summary for Reach 6R: Memorial Ave Ditch Inflow Area = 2.588 ac, 62.17% Impervious, Inflow Depth = 3.00" for 10-yr event Inflow = 8.83 cfs @ 12.16 hrs, Volume= 0.647 of Outflow = 8.60 cfs @ 12.20 hrs, Volume= 0.647 af, Atten= 3%, Lag= 2.7 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 2.03 fps, Min. Travel Time= 1.5 min Avg. Velocity = 0.53 fps, Avg. Travel Time= 5.6 min Peak Storage= 764 cf @ 12.17 hrs Average Depth at Peak Storage= 0.37' Bank-Full Depth= 2.00' Flow Area=45.0 sf, Capacity= 240.24 cfs Custom cross-section, Length= 178.0' Slope= 0.0084 '1 Constant n= 0.030 Short grass Inlet Invert= 37.00', Outlet Invert= 35.50' Offset Elevation Chan.Depth (feet) (feet) (feet) 0.00 38.00 0.00 3.00 37.00 1.00 8.00 36.00 2.00 17.00 36.00 2.00 26.00 37.00 1.00 35.00 38.00 0.00 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr SI 10-yr Rainfall=4.17" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 13 Depth End Area Perim. Storage Discharge (feet) (sq-ft) (feet) (cubic-feet) (cfs) 0.00 0.0 9.0 0 0.00 1.00 16.0 23.2 2,848 56.86 2.00 45.0 35.4 8,010 240.24 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 14 Time span=0.00-48.00 hrs, dt=0.05 hrs, 961 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Ex Morning Dove Ave Runoff Area=0.880 ac 79.55% Impervious Runoff Depth=6.39" Tc=7.0 min CN=93 Runoff=7.44 cfs 0.469 af Subcatchment 2S: Prop Pizza Ranch Runoff Area=1.001 ac 73.13% Impervious Runoff Depth=6.04" Tc=7.0 min CN=90 Runoff=8.19 cfs 0.504 af Subcatchment 3S: Prop Furniture Warehouse- Runoff Area=83.311 sf 67.77% Impervious Runoff Depth=6.04" Tc=7.0 min CN=90 Runoff=15.65 cfs 0.962 of Subcatchment 5S: Prop Warehouse-NW to Runoff Area=50.627 sf 40.17% Impervious Runoff Depth=5.35" Tc=15.0 min CN=84 Runoff=6.52 cfs 0.518 af Subcatchment 7S: adjacent parcel/future Runoff Area=55.687 sf 79.82% Impervious Runoff Depth=6.39" Tc=10.0 min CN=93 Runoff=9.49 cfs 0.681 of Subcatchment 8S: adjacent parcel/future Runoff Area=62.120 sf 80.10% Impervious Runoff Depth=6.39" Tc=15.0 min CN=93 Runoff=9.08 cfs 0.759 af Reach 4R: Existing Swale Avg. Flow Depth=0.73' Max Vel=3.82 fps Inflow=40.24 cfs 2.615 af n=0.035 L=321.0' S=0.0187'r Capacity=296.50 cfs Outflow=37.58 cfs 2.615 af Reach 6R: Memorial Ave Ditch Avg. Flow Depth=0.51' Max VeI=2.43 fps Inflow=15.60 cfs 1.277 af n=0.030 L=178.0' S=0.0084'P Capacity=240.24 cfs Outflow=15.23 cfs 1.277 af Total Runoff Area=7.660 ac Runoff Volume=3.893 af Average Runoff Depth=6.10" 30.06%Pervious=2.302 ac 69.94%Impervious=5.358 ac 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 1S: Ex Morning Dove Ave Runoff = 7.44 cfs @ 12.05 hrs, Volume= 0.469 af, Depth= 6.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Area (ac) CN Description * 0.700 98 pavement 0.180 74 >75% Grass cover, Good, HSG C 0.880 93 Weighted Average 0.180 20.45% Pervious Area 0.700 79.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 2S: Prop Pizza Ranch Development Runoff = 8.19 cfs @ 12.05 hrs, Volume= 0.504 af, Depth= 6.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Area (ac) CN Description * 0.732 98 parking and building * 0.269 69 green space and swale 1.001 90 Weighted Average 0.269 26.87% Pervious Area 0.732 73.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 3S: Prop Furniture Warehouse - SE to Swale Runoff = 15.65 cfs @ 12.05 hrs, Volume= 0.962 af, Depth= 6.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 16 Area (sf) CN Description * 28,871 98 building and future building * 2,477 98 truck dock * 25,114 98 pavement * 26,849 74 green space 83,311 90 Weighted Average 26,849 32.23% Pervious Area 56,462 67.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Summary for Subcatchment 5S: Prop Warehouse - NW to Memorial Ave Runoff = 6.52 cfs @ 12.16 hrs, Volume= 0.518 af, Depth= 5.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Area (sf) CN Description * 20,335 98 pavement * 1,704 74 green space in parking area * 28,588 74 Swale and Ditch Areas 50,627 84 Weighted Average 30,292 59.83% Pervious Area 20,335 40.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, 10 Summary for Subcatchment 7S: adjacent parcel /future development Runoff = 9.49 cfs @ 12.09 hrs, Volume= 0.681 af, Depth= 6.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Area (sf) CN Description * 44,450 98 future development impervious * 11,237 74 future development perivous 55,687 93 Weighted Average 11,237 20.18% Pervious Area 44,450 79.82% Impervious Area 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD® 10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 17 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Summary for Subcatchment 8S: adjacent parcel / future development Runoff = 9.08 cfs @ 12.16 hrs, Volume= 0.759 af, Depth= 6.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Area (sf) CN Description 49,760 98 impervious area 12,360 74 pervious area 62,120 93 Weighted Average 12,360 19.90% Pervious Area 49,760 80.10% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, Summary for Reach 4R: Existing Swale Inflow Area = 5.072 ac, 73.91% Impervious, Inflow Depth = 6.19" for 100-yr event Inflow = 40.24 cfs @ 12.06 hrs, Volume= 2.615 of Outflow = 37.58 cfs @ 12.10 hrs, Volume= 2.615 af, Atten= 7%, Lag= 2.8 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 3.82 fps, Min. Travel Time= 1.4 min Avg. Velocity = 0.97 fps, Avg. Travel Time= 5.5 min Peak Storage= 3,219 cf @ 12.08 hrs Average Depth at Peak Storage= 0.73' Bank-Full Depth= 2.00' Flow Area= 45.8 sf, Capacity= 296.50 cfs Custom cross-section, Length= 321.0' Slope= 0.0187 '/' Constant n= 0.035 High grass Inlet Invert= 936.00', Outlet Invert= 930.00' 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD® 10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 18 Offset Elevation Chan.Depth (feet) (feet) (feet) 0.00 938.00 0.00 6.50 937.00 1.00 13.50 936.00 2.00 22.50 936.00 2.00 28.50 937.00 1.00 38.50 938.00 0.00 Depth End Area Perim. Storage Discharge (feet) (sq-ft) (feet) (cubic-feet) (cfs) 0.00 0.0 9.0 0 0.00 1.00 15.5 22.2 4,976 70.91 2.00 45.8 38.8 14,686 296.50 Summary for Reach 6R: Memorial Ave Ditch Inflow Area = 2.588 ac, 62.17% Impervious, Inflow Depth = 5.92" for 100-yr event Inflow = 15.60 cfs @ 12.16 hrs, Volume= 1.277 af Outflow = 15.23 cfs @ 12.20 hrs, Volume= 1.277 af, Atten= 2%, Lag= 2.3 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Max. Velocity= 2.43 fps, Min. Travel Time= 1.2 min Avg. Velocity = 0.65 fps, Avg. Travel Time= 4.6 min Peak Storage= 1,133 cf @ 12.17 hrs Average Depth at Peak Storage= 0.51' Bank-Full Depth= 2.00' Flow Area= 45.0 sf, Capacity=240.24 cfs Custom cross-section, Length= 178.0' Slope= 0.0084 '/' Constant n= 0.030 Short grass Inlet Invert= 37.00', Outlet Invert= 35.50' a,ark 3 Offset Elevation Chan.Depth (feet) (feet) (feet) 0.00 38.00 0.00 3.00 37.00 1.00 8.00 36.00 2.00 17.00 36.00 2.00 26.00 37.00 1.00 35.00 38.00 0.00 4413-Proposed Funiture Warehouse-16-05-10 MN-Stillwater 24-hr S1 100-yr Rainfall=7.22" Prepared by Westwood Professional Services, Inc. Printed 5/10/2016 HydroCAD®10.00-14 s/n 03363 ©2015 HydroCAD Software Solutions LLC Page 19 Depth End Area Perim. Storage Discharge (feet) (sq-ft) (feet) (cubic-feet) (cfs) 0.00 0.0 9.0 0 0.00 1.00 16.0 23.2 2,848 56.86 2.00 45.0 35.4 8,010 240.24