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HomeMy WebLinkAboutWPO202100063 Stormwater Management Maintenance Agree. 2021-12-061S (4S DA-Post DA-Pre 3P SWM#1 Ext'd Detention Lvl 2 Subcat Reach on Link Routing Diagram for Dunlora WPO-SWM1 Prepared by HP Inc., Printed 12/6/2021 FHydroCAD@) 10.10-6a s/n 08126 © 2020 HydroCAD Software Solutions LLC Dunlora WPO-SWM1 Prepared by HP Inc. Project Notes Defined 10 rainfall events from Albemarle Rainfall OF Printed 12/6/2021 Dunlora WPO-SWM1 Prepared by HP Inc. Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1-yr Type II 24-hr Default 24.00 1 2.97 2 2 2-yr Type II 24-hr Default 24.00 1 3.59 2 3 10-yr Type II 24-hr Default 24.00 1 5.43 2 4 25-yr Type II 24-hr Default 24.00 1 6.67 2 5 50-yr Type II 24-hr Default 24.00 1 7.73 2 6 100-yr Type II 24-hr Default 24.00 1 8.90 2 Printed 12/6/2021 Dunlora WPO-SWM1 Prepared by HP Inc. Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 12.900 75 (1S) 11.570 61 (4S) 24.470 68 TOTAL AREA Printed 12/6/2021 Dunlora WPO-SWM1 Prepared by HP Inc. Area Soil Soil Listing (all nodes) Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 24.470 Other 1S, 4S 24.470 TOTAL AREA Printed 12/6/2021 Dunlora WPO-SWM1 Prepared by HP Inc. Ground Covers (all nodes) Printed 12/6/2021 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 0.000 24.470 24.470 1 S, 4S 0.000 0.000 0.000 0.000 24.470 24.470 TOTAL AREA Dunlora WPO-SWM1 Prepared by HP Inc. Pipe Listing (all nodes) Printed 12/6/2021 Line# Node In -Invert Out -Invert Length Slope n Width Diam/Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 3P 380.00 366.00 122.0 0.1148 0.020 0.0 36.0 0.0 Dunlora WPO-SWM1 Type 1124-hr 1-yrRainfall=2.97" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paae 8 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=12.900 ac 0.00% Impervious Runoff Depth>0.85" Tc=10.0 min CN=75 Runoff=17.87 cfs 0.910 of Subcatchment 4S: DA-Pre Runoff Area=11.570 ac 0.00% Impervious Runoff Depth>0.30" Tc=11.8 min CN=61 Runoff=3.70 cfs 0.289 of Pond 3P: SWM#1 Ext'd Detention Lvl 2 Peak Elev=386.87' Storage=28,472 cf Inflow=17.87 cfs 0.910 of Primary=2.75 cfs 0.877 of Secondary=0.00 cfs 0.000 of Outflow=2.75 cfs 0.877 of Total Runoff Area = 24.470 ac Runoff Volume = 1.199 of Average Runoff Depth = 0.59" 100.00% Pervious = 24.470 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 17.87 cfs @ 12.03 hrs, Volume= 0.910 af, Depth> 0.85" Routed to Pond 3P : SWM#1 Ext'd Detention Lvl 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=2.97" Area (ac) CN Description 12.900 75 12.900 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph ■ Rurwff 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 3.70 cfs @ 12.08 hrs, Volume= 0.289 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 Type II 24-hr 1-yr Rainfall=2.97" Area (ac) CN Description 3.920 61 7.650 61 11.570 61 Weighted Average 11.570 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph 4- _ _ _ _ _ _ ❑Runoff 3 70 cfs Type II 24-hr 1-yr Rainfall=2.97rr 3- Runoff Area=11.570 ac Runoff Volume=0.289 of Runoff Depth>0.30" 2 Tc=11.8 min I I I CN=61 f 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Dunlora WPO-SWM1 Prepared by HIP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Summary for Pond 3P: SWM#1 Ext'd Detention Lvl 2 Inflow Area = 12.900 ac, 0.00% Impervious, Inflow Depth > 0.85" for 1-yr event Inflow = 17.87 cfs @ 12.03 hrs, Volume= 0.910 of Outflow = 2.75 cfs @ 12.44 hrs, Volume= 0.877 af, Atten= 85%, Lag= 24.9 min Primary = 2.75 cfs @ 12.44 hrs, Volume= 0.877 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 384.50' Surf.Area= 5,398 sf Storage= 12,958 cf Peak Elev= 386.87' @ 12.44 hrs Surf.Area= 7,564 sf Storage= 28,472 cf (15,514 cf above start) Plug -Flow detention time= 198.4 min calculated for 0.580 of (64% of inflow) Center -of -Mass det. time= 57.5 min ( 870.1 - 812.6 ) Volume Invert Avail.Storage Storage Description #1 380.00' 77,941 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 380.00 1,012 0 0 382.00 2,242 3,254 3,254 384.00 4,890 7,132 10,386 386.00 6,922 11,812 22,198 388.00 8,404 15,326 37,524 390.00 9,984 18,388 55,912 392.00 12,045 22,029 77,941 Device Routing Invert Outlet Devices #1 Primary 380.00' 36.0" Round Culvert L= 122.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 380.00' / 366.00' S= 0.1148 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 7.07 sf #2 Device 1 384.50' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 390.50' 60.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 391.50' 16.0' long x 16.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=2.75 cfs @ 12.44 hrs HW=386.87' (Free Discharge) t1=Culvert (Passes 2.75 cfs of 69.56 cfs potential flow) �2=Orifice/Grate (Orifice Controls 2.75 cfs @ 7.00 fps) 3=Orifice/Grate ( Controls 0.00 cfs) econdary OutFlow Max=0.00 cfs @ 5.00 hrs HW=384.50' (Free Discharge) =Broad -Crested Rectangular Weir ( Controls 0.00 cfs) Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 1-yrRainfall=2.97" Printed 12/6/2021 Pond 3P: SWM#1 Ext'd Detention Lvl 2 Hydrograph Time (hours) 111 111 111 111 ❑ Inflow ❑ Outflow ❑ Primary ❑ Secondary Dunlora WPO-SWM1 Type 1124-hr 2-yr Rainfall=3.59 " Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 13 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=12.900 ac 0.00% Impervious Runoff Depth>1.24" Tc=10.0 min CN=75 Runoff=26.43 cfs 1.333 of Subcatchment 4S: DA-Pre Runoff Area=11.570 ac 0.00% Impervious Runoff Depth>0.53" Tc=11.8 min CN=61 Runoff=8.20 cfs 0.514 of Pond 3P: SWM#1 Ext'd Detention Lvl 2 Peak Elev=388.05' Storage=37,962 cf Inflow=26.43 cfs 1.333 of Primary=3.44 cfs 1.293 of Secondary=0.00 cfs 0.000 of Outflow=3.44 cfs 1.293 of Total Runoff Area = 24.470 ac Runoff Volume = 1.846 of Average Runoff Depth = 0.91" 100.00% Pervious = 24.470 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 2-yrRainfall=3.59" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 26.43 cfs @ 12.02 hrs, Volume= 1.333 af, Depth> 1.24" Routed to Pond 3P : SWM#1 Ext'd Detention Lvl 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr Rainfall=3.59" Area (ac) CN Description 12.900 75 12.900 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph 0 LL '-__ ____ ■--■ �IM■■■■■■■ ■■■■ ■r... ■■■ffOMM® ■■■■■■■ ■�■ww�wrr■ ■■■■■■■ III ■■■■■■■,��eaa ■■■■■■■■r:��w-�zNan ■■■■■■■ O �!�■■■■■■■■1JIMMMM,■■■■ w_M w_wM MMMMMMM ■■■■■-. ,■■■■■■■ ■■■■■■; I MM 6 7 8 9 19 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 2-yr Rainfall=3.59 " Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 8.20 cfs @ 12.06 hrs, Volume= 0.514 af, Depth> 0.53" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr Rainfall=3.59" Area (ac) CN Description 3.920 61 7.650 61 11.570 61 Weighted Average 11.570 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph ❑ RunoH 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Dunlora WPO-SWM1 Prepared by HIP Inc. Type 1124-hr 2-yrRainfall=3.59" Printed 12/6/2021 Summary for Pond 3P: SWM#1 Ext'd Detention Lvl 2 Inflow Area = 12.900 ac, 0.00% Impervious, Inflow Depth > 1.24" for 2-yr event Inflow = 26.43 cfs @ 12.02 hrs, Volume= 1.333 of Outflow = 3.44 cfs @ 12.50 hrs, Volume= 1.293 af, Atten= 87%, Lag= 28.5 min Primary = 3.44 cfs @ 12.50 hrs, Volume= 1.293 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 384.50' Surf.Area= 5,398 sf Storage= 12,958 cf Peak Elev= 388.05' @ 12.50 hrs Surf.Area= 8,445 sf Storage= 37,962 cf (25,004 cf above start) Plug -Flow detention time= 183.3 min calculated for 0.992 of (74% of inflow) Center -of -Mass det. time= 76.1 min ( 880.6 - 804.5 ) Volume Invert Avail.Storage Storage Description #1 380.00' 77,941 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 380.00 1,012 0 0 382.00 2,242 3,254 3,254 384.00 4,890 7,132 10,386 386.00 6,922 11,812 22,198 388.00 8,404 15,326 37,524 390.00 9,984 18,388 55,912 392.00 12,045 22,029 77,941 Device Routing Invert Outlet Devices #1 Primary 380.00' 36.0" Round Culvert L= 122.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 380.00' / 366.00' S= 0.1148 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 7.07 sf #2 Device 1 384.50' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 390.50' 60.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 391.50' 16.0' long x 16.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=3.44 cfs @ 12.50 hrs HW=388.05' (Free Discharge) t1=Culvert (Passes 3.44 cfs of 76.87 cfs potential flow) �2=Orifice/Grate (Orifice Controls 3.44 cfs @ 8.75 fps) 3=Orifice/Grate ( Controls 0.00 cfs) econdary OutFlow Max=0.00 cfs @ 5.00 hrs HW=384.50' (Free Discharge) =Broad -Crested Rectangular Weir ( Controls 0.00 cfs) Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 2-yr Rainfall=3.59 " Printed 12/6/2021 Pond 3P: SWM#1 Ext'd Detention Lvl 2 Hydrograph Time (hours) ■ Inflow ❑ Outflow ❑ Primary ❑ Secondary Dunlora WPO-SWM1 Type // 24-hr 10-yrRainfall=5.43" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 18 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=12.900 ac 0.00% Impervious Runoff Depth>2.58" Tc=10.0 min CN=75 Runoff=54.75 cfs 2.773 of Subcatchment 4S: DA-Pre Runoff Area=11.570 ac 0.00% Impervious Runoff Depth>1.46" Tc=11.8 min CN=61 Runoff=25.96 cfs 1.412 of Pond 3P: SWM#1 Ext'd Detention Lvl 2 Peak Elev=390.87' Storage=65,000 cf Inflow=54.75 cfs 2.773 of Primary=16.35 cfs 2.656 of Secondary=0.00 cfs 0.000 of Outflow=16.35 cfs 2.656 of Total Runoff Area = 24.470 ac Runoff Volume = 4.186 of Average Runoff Depth = 2.05" 100.00% Pervious = 24.470 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM1 Prepared by HP Inc. Type II 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 54.75 cfs @ 12.02 hrs, Volume= 2.773 af, Depth> 2.58" Routed to Pond 3P : SWM#1 Ext'd Detention Lvl 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.43" Area (ac) CN 12.900 75 12.900 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph ���� A...� l..... ..... ammmmm ..... l mmmm ..... ::::: .... , .. ! I r ! 0 • . it .... !'%, :::::: Time (bome) ■ Runoff Dunlora WPO-SWM1 Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 25.96 cfs @ 12.05 hrs, Volume= 1.412 af, Depth> 1.46" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.43" Area (ac) CN Description 3.920 61 7.650 61 11.570 61 Weighted Average 11.570 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph ■ Rurwff 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Dunlora WPO-SWM1 Prepared by HIP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Summary for Pond 3P: SWM#1 Ext'd Detention Lvl 2 Inflow Area = 12.900 ac, 0.00% Impervious, Inflow Depth > 2.58" for 10-yr event Inflow = 54.75 cfs @ 12.02 hrs, Volume= 2.773 of Outflow = 16.35 cfs @ 12.22 hrs, Volume= 2.656 af, Atten= 70%, Lag= 12.1 min Primary = 16.35 cfs @ 12.22 hrs, Volume= 2.656 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 384.50' Surf.Area= 5,398 sf Storage= 12,958 cf Peak Elev= 390.87' @ 12.22 hrs Surf.Area= 10,882 sf Storage= 65,000 cf (52,042 cf above start) Plug -Flow detention time= 168.7 min calculated for 2.351 of (85% of inflow) Center -of -Mass det. time= 99.6 min ( 888.8 - 789.2 ) Volume Invert Avail.Storage Storage Description #1 380.00' 77,941 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 380.00 1,012 0 0 382.00 2,242 3,254 3,254 384.00 4,890 7,132 10,386 386.00 6,922 11,812 22,198 388.00 8,404 15,326 37,524 390.00 9,984 18,388 55,912 392.00 12,045 22,029 77,941 Device Routing Invert Outlet Devices #1 Primary 380.00' 36.0" Round Culvert L= 122.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 380.00' / 366.00' S= 0.1148 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 7.07 sf #2 Device 1 384.50' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 390.50' 60.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 391.50' 16.0' long x 16.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=15.56 cfs @ 12.22 hrs HW=390.86' (Free Discharge) t1=Culvert (Passes 15.56 cfs of 91.86 cfs potential flow) �2=Orifice/Grate (Orifice Controls 4.67 cfs @ 11.90 fps) 3=Orifice/Grate (Weir Controls 10.89 cfs @ 1.95 fps) econdary OutFlow Max=0.00 cfs @ 5.00 hrs HW=384.50' (Free Discharge) =Broad -Crested Rectangular Weir ( Controls 0.00 cfs) Dunlora WPO-SWM1 Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 12/6/2021 Pond 3P: SWM#1 Ext'd Detention Lvl 2 Hydrograph ■ Inflow ❑ Outflow )w Area=1❑ 2.900 ac Primary Secondary Peak Elev=390.87' Storage=65,000 cf 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (hours) Dunlora WPO-SWM1 Type 1124-hr 25-yrRainfall=6.67" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 23 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=12.900 ac 0.00% Impervious Runoff Depth>3.57" Tc=10.0 min CN=75 Runoff=75.05 cfs 3.840 of Subcatchment 4S: DA-Pre Runoff Area=11.570 ac 0.00% Impervious Runoff Depth>2.23" Tc=11.8 min CN=61 Runoff=40.22 cfs 2.154 of Pond 3P: SWM#1 Ext'd Detention Lvl 2 Peak Elev=391.46' Storage=71,551 cf Inflow=75.05 cfs 3.840 of Primary=52.84 cfs 3.641 of Secondary=0.00 cfs 0.000 of Outflow=52.84 cfs 3.641 of Total Runoff Area = 24.470 ac Runoff Volume = 5.994 of Average Runoff Depth = 2.94" 100.00% Pervious = 24.470 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM1 Prepared by HP Inc. Type II 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 75.05 cfs @ 12.01 hrs, Volume= 3.840 af, Depth> 3.57" Routed to Pond 3P : SWM#1 Ext'd Detention Lvl 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-yr Rainfall=6.67" Area (ac) CN Description 12.900 75 12.900 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph ■ Rurwff 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Dunlora WPO-SWM1 Prepared by HP Inc. Type 11 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 40.22 cfs @ 12.04 hrs, Volume= 2.154 af, Depth> 2.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-yr Rainfall=6.67" Area (ac) CN 3.920 61 7.650 61 11.570 61 Weighted Average 11.570 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph - ao 22 dl Type II 24-hr 25-yr Rainfall=6.67" Runoff Area=11.570 ac Runoff Volume=2.154 of 1 Runoff Depth>2.23" � I Tc=11.8 min CN=61 5, 6, 7, 8, 9 .1,6„ .1,1„ .1,2„ .1,3. „1,4. „1,6. „1, 6 17 18 19 20 Time (hours) ❑ Runoff Dunlora WPO-SWM1 Prepared by HIP Inc. Type 11 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Summary for Pond 3P: SWM#1 Ext'd Detention Lvl 2 Inflow Area = 12.900 ac, 0.00% Impervious, Inflow Depth > 3.57" for 25-yr event Inflow = 75.05 cfs @ 12.01 hrs, Volume= 3.840 of Outflow = 52.84 cfs @ 12.11 hrs, Volume= 3.641 af, Atten= 30%, Lag= 5.9 min Primary = 52.84 cfs @ 12.11 hrs, Volume= 3.641 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 384.50' Surf.Area= 5,398 sf Storage= 12,958 cf Peak Elev= 391.46' @ 12.11 hrs Surf.Area= 11,485 sf Storage= 71,551 cf (58,593 cf above start) Plug -Flow detention time= 136.1 min calculated for 3.333 of (87% of inflow) Center -of -Mass det. time= 78.3 min ( 860.4 - 782.1 ) Volume Invert Avail.Storage Storage Description #1 380.00' 77,941 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 380.00 1,012 0 0 382.00 2,242 3,254 3,254 384.00 4,890 7,132 10,386 386.00 6,922 11,812 22,198 388.00 8,404 15,326 37,524 390.00 9,984 18,388 55,912 392.00 12,045 22,029 77,941 Device Routing Invert Outlet Devices #1 Primary 380.00' 36.0" Round Culvert L= 122.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 380.00' / 366.00' S= 0.1148 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 7.07 sf #2 Device 1 384.50' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 390.50' 60.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 391.50' 16.0' long x 16.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=49.98 cfs @ 12.11 hrs HW=391.42' (Free Discharge) t1=Culvert (Passes 49.98 cfs of 94.57 cfs potential flow) �2=Orifice/Grate (Orifice Controls 4.88 cfs @ 12.43 fps) 3=Orifice/Grate (Weir Controls 45.09 cfs @ 3.13 fps) econdary OutFlow Max=0.00 cfs @ 5.00 hrs HW=384.50' (Free Discharge) =Broad -Crested Rectangular Weir ( Controls 0.00 cfs) Dunlora WPO-SWM1 Prepared by HP Inc. Type 11 24-hr 25-yr Rainfall=6.67" Printed 12/6/2021 Pond 3P: SWM#1 Ext'd Detention Lvl 2 Hydrograph ❑ Inflow ❑ Outflow ❑ Primary ❑ Secondary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Dunlora WPO-SWM1 Type 1124-hr 50-yr Rainfall= 7.73 " Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 28 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=12.900 ac 0.00% Impervious Runoff Depth>4.46" Tc=10.0 min CN=75 Runoff=92.75 cfs 4.790 of Subcatchment 4S: DA-Pre Runoff Area=11.570 ac 0.00% Impervious Runoff Depth>2.95" Tc=11.8 min CN=61 Runoff=53.33 cfs 2.846 of Pond 3P: SWM#1 Ext'd Detention Lvl 2 Peak Elev=391.77' Storage=75,200 cf Inflow=92.75 cfs 4.790 of Primary=77.92 cfs 4.478 of Secondary=4.72 cfs 0.033 of Outflow=82.62 cfs 4.511 of Total Runoff Area = 24.470 ac Runoff Volume = 7.636 of Average Runoff Depth = 3.74" 100.00% Pervious = 24.470 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM1 Prepared by HP Inc. Type 11 24-hr 50-yr Rainfall= 7.73 " Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 92.75 cfs @ 12.01 hrs, Volume= 4.790 af, Depth> 4.46" Routed to Pond 3P : SWM#1 Ext'd Detention Lvl 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 50-yr Rainfall=7.73" Area (ac) CN 12.900 75 12.900 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph ■ Rurwff Time (hours) Dunlora WPO-SWM1 Prepared by HP Inc. Type 11 24-hr 50-yr Rainfall= 7.73 " Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 53.33 cfs @ 12.04 hrs, Volume= 2.846 af, Depth> 2.95" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 50-yr Rainfall=7.73" Area (ac) CN 3.920 61 7.650 61 11.570 61 Weighted Average 11.570 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph - 5333 cfs Type II 24-hr - 50-yr Rainfall=7.73" Runoff Area=11.570 ac - Runoff Volume=2.846 of Runoff Depth>2.95" Tc=11.8 min CN=61 8, 9 .1,6„ .1,1„ .1,2„ .1,3. „1,4. „1,5. „1, 6 17 18 19 20 Time (hours) ❑ RunoH Dunlora WPO-SWM1 Prepared by HIP Inc. Type II 24-hr 50-yr Rainfall= 7.73 " Printed 12/6/2021 Summary for Pond 3P: SWM#1 Ext'd Detention Lvl 2 Inflow Area = 12.900 ac, 0.00% Impervious, Inflow Depth > 4.46" for 50-yr event Inflow = 92.75 cfs @ 12.01 hrs, Volume= 4.790 of Outflow = 82.62 cfs @ 12.07 hrs, Volume= 4.511 af, Atten= 11%, Lag= 3.5 min Primary = 77.92 cfs @ 12.07 hrs, Volume= 4.478 of Secondary = 4.72 cfs @ 12.07 hrs, Volume= 0.033 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 384.50' Surf.Area= 5,398 sf Storage= 12,958 cf Peak Elev= 391.77' @ 12.07 hrs Surf.Area= 11,808 sf Storage= 75,200 cf (62,242 cf above start) Plug -Flow detention time= 118.3 min calculated for 4.200 of (88% of inflow) Center -of -Mass det. time= 65.1 min ( 842.3 - 777.2 ) Volume Invert Avail.Storage Storage Description #1 380.00' 77,941 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 380.00 1,012 0 0 382.00 2,242 3,254 3,254 384.00 4,890 7,132 10,386 386.00 6,922 11,812 22,198 388.00 8,404 15,326 37,524 390.00 9,984 18,388 55,912 392.00 12,045 22,029 77,941 Device Routing Invert Outlet Devices #1 Primary 380.00' 36.0" Round Culvert L= 122.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 380.00' / 366.00' S= 0.1148 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 7.07 sf #2 Device 1 384.50' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 390.50' 60.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 391.50' 16.0' long x 16.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=72.77 cfs @ 12.07 hrs HW=391.70' (Free Discharge) t1=Culvert (Passes 72.77 cfs of 95.93 cfs potential flow) �2=Orifice/Grate (Orifice Controls 4.99 cfs @ 12.70 fps) 3=Orifice/Grate (Weir Controls 67.79 cfs @ 3.59 fps) econdary OutFlow Max=3.99 cfs @ 12.07 hrs HW=391.71' (Free Discharge) =Broad -Crested Rectangular Weir (Weir Controls 3.99 cfs @ 1.22 fps) Dunlora WPO-SWM1 Prepared by HP Inc. 15, / in ' < Type 1124-hr 50-yr Rainfall=7.73" Printed 12/6/2021 Pond 3P: SWM#1 Ext'd Detention Lvl 2 Hydrograph Inflow Area=12.900 ac 82 61 Cf j Peak Elev=391.77' Storage=75,200 cf 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (hours) ■ Inflow ❑ Outflow ❑ Primary ❑ Secondary Dunlora WPO-SWM1 Type 1124-hr 100-yrRaintall=8.90" Prepared by HP Inc. Printed 12/6/2021 HvdroCADO 10.10-6a s/n 08126 © 2020 HvdroCAD Software Solutions LLC Paoe 33 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind method - Pond routing by Stor-Ind method Subcatchment 1S: DA-Post Runoff Area=12.900 ac 0.00% Impervious Runoff Depth>5.46" Tc=10.0 min CN=75 Runoff=112.46 cfs 5.866 of Subcatchment 4S: DA-Pre Runoff Area=11.570 ac 0.00% Impervious Runoff Depth>3.79" Tc=11.8 min CN=61 Runoff=68.49 cfs 3.659 of Pond 3P: SWM#1 Ext'd Detention Lvl 2 Peak Elev=391.96' Storage=77,431 cf Inflow=112.46 cfs 5.866 of Primary=94.14 cfs 5.372 of Secondary=13.45 cfs 0.123 of Outflow=107.59 cfs 5.495 of Total Runoff Area = 24.470 ac Runoff Volume = 9.524 of Average Runoff Depth = 4.67" 100.00% Pervious = 24.470 ac 0.00% Impervious = 0.000 ac Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Summary for Subcatchment 1 S: DA-Post Runoff = 112.46 cfs @ 12.01 hrs, Volume= 5.866 af, Depth> 5.46" Routed to Pond 3P : SWM#1 Ext'd Detention Lvl 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=8.90" Area (ac) CN Description 12.900 75 12.900 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 1S: DA-Post Hydrograph 125 _- _ _ .. T _... _ _.. 120 ■ Rurgff ii I, 1 1 • � ,• 1 Tc=10.0 min Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Summary for Subcatchment 4S: DA-Pre Runoff = 68.49 cfs @ 12.04 hrs, Volume= 3.659 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=8.90" Area (ac) CN ' 3.920 61 ' 7.650 61 11.570 61 Weighted Average 11.570 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.8 Direct Entry, Subcatchment 4S: DA-Pre Hydrograph I ----- ----- ----- ----Tc=11.8 ----- ® -- i • • ac- Runoff • Runoff min I100-yr '. - ---� ,III,'•////■���///////////J ,da 5, 6, 7, 8, 9, 1,0„ .1,1„ .1,2. .1,3. „1,4. „1,5. „1,6.,1,7. 1„ 8 19 20 Time (hours) ■ Rurwff Dunlora WPO-SWM1 Prepared by HIP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Summary for Pond 3P: SWM#1 Ext'd Detention Lvl 2 Inflow Area = 12.900 ac, 0.00% Impervious, Inflow Depth > 5.46" for 100-yr event Inflow = 112.46 cfs @ 12.01 hrs, Volume= 5.866 of Outflow = 107.59 cfs @ 12.05 hrs, Volume= 5.495 af, Atten= 4%, Lag= 2.4 min Primary = 94.14 cfs @ 12.05 hrs, Volume= 5.372 of Secondary = 13.45 cfs @ 12.05 hrs, Volume= 0.123 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 384.50' Surf.Area= 5,398 sf Storage= 12,958 cf Peak Elev= 391.96' @ 12.05 hrs Surf.Area= 12,001 sf Storage= 77,431 cf (64,473 cf above start) Plug -Flow detention time= 104.1 min calculated for 5.180 of (88% of inflow) Center -of -Mass det. time= 54.0 min ( 826.6 - 772.6 ) Volume Invert Avail.Storage Storage Description #1 380.00' 77,941 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 380.00 1,012 0 0 382.00 2,242 3,254 3,254 384.00 4,890 7,132 10,386 386.00 6,922 11,812 22,198 388.00 8,404 15,326 37,524 390.00 9,984 18,388 55,912 392.00 12,045 22,029 77,941 Device Routing Invert Outlet Devices #1 Primary 380.00' 36.0" Round Culvert L= 122.0' Box, 00 wingwalls, square crown edge, Ke= 0.700 Inlet / Outlet Invert= 380.00' / 366.00' S= 0.1148 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 7.07 sf #2 Device 1 384.50' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Device 1 390.50' 60.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Secondary 391.50' 16.0' long x 16.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=94.71 cfs @ 12.05 hrs HW=391.95' (Free Discharge) t1=Culvert (Passes 94.71 cfs of 97.08 cfs potential flow) �2=Orifice/Grate (Orifice Controls 5.07 cfs @ 12.92 fps) 3=Orifice/Grate (Weir Controls 89.64 cfs @ 3.94 fps) econdary OutFlow Max=13.07 cfs @ 12.05 hrs HW=391.95' (Free Discharge) =Broad -Crested Rectangular Weir (Weir Controls 13.07 cfs @ 1.81 fps) Dunlora WPO-SWM1 Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 12/6/2021 Pond 3P: SWM#1 Ext'd Detention Lvl 2 Hydrograph ■ Inflow ❑ Outflow ❑ Primary ❑ Secondary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours)