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HomeMy WebLinkAboutWPO202200038 Calculations 2022-09-141S Pre -Developed Site 3S Pre -Developed Good Forested 2S Post -Developed Site Subcat Reach Aon Llnk Breezy Poa's Prepared by HP Inc. Project Notes Defined 5 rainfall events from Albemarle Rainfall OF Printed 9/6/2022 Breezy Poa's Prepared by HP Inc. Area Listing (selected nodes) Area CN Description (acres) (subcatchment-numbers) 11.200 98 (2S) 12.000 84 50-75% Grass cover, Fair, HSG D (1S) 53.830 80 >75% Grass cover, Good, HSG D (2S) 1.330 98 IMPERVIOIUSNESS (1S) 168.630 77 Woods, Good, HSG D (1S, 2S, 3S) 246.990 79 TOTAL AREA Printed 9/6/2022 Breezy Poa's Prepared by HP Inc. Type/1 24-hr 1 inch Rainfall= 1. 00 " Printed 9/6/2022 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 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: Pre -Developed Site Runoff Area=82.330 ac 1.62% Impervious Runoff Depth>0.06" Flow Length=950' Tc=20.7 min CN=78 Runoff=1.28 cfs 0.395 of Subcatchment 2S: Post -Developed Site Runoff Area=82.330 ac 13.60% Impervious Runoff Depth>0.11" Flow Length=450' Tc=10.6 min CN=82 Runoff=8.89 cfs 0.780 of Subcatchment 3S: Pre -Developed Good Runoff Area=82.330 ac 0.00% Impervious Runoff Depth>0.05" Flow Length=950' Tc=20.7 min CN=77 Runoff=0.78 cfs 0.323 of Total Runoff Area = 246.990 ac Runoff Volume = 1.497 of Average Runoff Depth = 0.07" 94.93% Pervious = 234.460 ac 5.07% Impervious = 12.530 ac Breezy Poa's Prepared by HP Inc. Type Il 24-hr 1 inch Rainfall= 1. 00 " Printed 9/6/2022 Summary for Subcatchment 1 S: Pre -Developed Site Runoff = 1.28 cfs @ 12.30 hrs, Volume= 0.395 af, Depth> 0.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 inch Rainfall=1.00" Area (ac) CN 69.000 77 Woods, Good, HSG D 12.000 84 50-75% Grass cover, Fair, HSG D 1.330 98 IMPERVIOUSNESS 82.330 78 Weighted Average 81.000 98.38% Pervious Area 1.330 1.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 1S: Pre -Developed Site Hydrograph Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type/1 24-hr 1 inch Rainfall= 1. 00 " Printed 9/6/2022 Summary for Subcatchment 2S: Post -Developed Site Runoff = 8.89 cfs @ 12.06 hrs, Volume= 0.780 af, Depth> 0.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 inch Rainfall=1.00" Area (ac) CN Description 11.200 98 53.830 80 >75% Grass cover, Good, HSG D 17.300 77 Woods, Good, HSG D 82.330 82 Weighted Average 71.130 86.40% Pervious Area 11.200 13.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 150 0.0500 0.27 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 1.3 300 0.0650 3.82 Shallow Concentrated Flow, Shallow Concentrated Grassed Waterwav Kv= 15.0 fps 10.6 450 Total Subcatchment 2S: Post -Developed Site Hydrograph p RunoH 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 i6 19 20 21 22 23 24 Time (hours) Breezy Poa's Prepared by HP Inc. Type/1 24-hr 1 inch Rainfall= 1. 00 " Printed 9/6/2022 Summary for Subcatchment 3S: Pre -Developed Good Forested Runoff = 0.78 cfs @ 12.50 hrs, Volume= 0.323 af, Depth> 0.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 inch Rainfall=1.00" Area (ac) CN 82.330 77 Woods, Good, HSG D 82.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 3S: Pre -Developed Good Forested Hydrograph ■ Runoff Time (hours) Breezy Poa's Prepared by HP Inc. Type // 24-hr 1-yr Rainfall=2.97" Printed 9/6/2022 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 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: Pre -Developed Site Runoff Area=82.330 ac 1.62% Impervious Runoff Depth>1.10" Flow Length=950' Tc=20.7 min CN=78 Runoff=95.96 cfs 7.551 of Subcatchment 2S: Post -Developed Site Runoff Area=82.330 ac 13.60% Impervious Runoff Depth>1.35" Flow Length=450' Tc=10.6 min CN=82 Runoff=165.50 cfs 9.275 of Subcatchment 3S: Pre -Developed Good Runoff Area=82.330 ac 0.00% Impervious Runoff Depth>1.04" Flow Length=950' Tc=20.7 min CN=77 Runoff=90.26 cfs 7.160 of Total Runoff Area = 246.990 ac Runoff Volume = 23.986 of Average Runoff Depth = 1.17" 94.93% Pervious = 234.460 ac 5.07% Impervious = 12.530 ac Breezy Poa's Prepared by HP Inc. Type // 24-hr 1-yr Rainfall=2.97" Printed 9/6/2022 Summary for Subcatchment 1 S: Pre -Developed Site [47] Hint: Peak is 129% of capacity of segment #3 Runoff = 95.96 cfs @ 12.15 hrs, Volume= 7.551 af, Depth> 1.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=2.97" Area (ac) CN Description 69.000 77 Woods, Good, HSG D 12.000 84 50-75% Grass cover, Fair, HSG D 1.330 98 IMPERVIOUSNESS 82.330 78 Weighted Average 81.000 98.38% Pervious Area 1.330 1.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total 3 LL Subcatchment 1S: Pre -Developed Site Hydrograph .......... ' .1 .......--... - ---..1 ........... . ......N.i100, mmmmmmm mm mmm m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type // 24-hr 1-yr Rainfall=2.97" Printed 9/6/2022 Summary for Subcatchment 2S: Post -Developed Site Runoff = 165.50 cfs @ 12.03 hrs, Volume= 9.275 af, Depth> 1.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=2.97" Area (ac) CN Description 11.200 98 53.830 80 >75% Grass cover, Good, HSG D 17.300 77 Woods, Good, HSG D 82.330 82 Weighted Average 71.130 86.40% Pervious Area 11.200 13.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 150 0.0500 0.27 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 1.3 300 0.0650 3.82 Shallow Concentrated Flow, Shallow Concentrated Grassed Waterwav Kv= 15.0 fps 10.6 450 Total 180 170 160 150 140 130 120 110 u 100 90 LL 80 70 60 50 40 30 20 10 0 Subcatchment 2S: Post -Developed Site Hydrograph pCE E` • - • 1 Runolf • -- •.275 • • 1 MOMMOMMOMM ������������ ■........... MMMMMMMMMMMM MEMMEMMEMEME EMMMEMMMMEMM MMMMMMMM ...■...I ■...■....■.. -.-.--.I '.--...--.-- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Runoff Breezy Poa's Prepared by HP Inc. Type // 24-hr 1-yr Rainfall=2.97" Printed 9/6/2022 Summary for Subcatchment 3S: Pre -Developed Good Forested [47] Hint: Peak is 121 % of capacity of segment #3 Runoff = 90.26 cfs @ 12.15 hrs, Volume= 7.160 af, Depth> 1.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=2.97" Area (ac) CN Description 82.330 77 Woods, Good, HSG D 82.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total 65 60 55 50 LL 45 Subcatchment 3S: Pre -Developed Good Forested Hydrograph ' M_M Runoff Area=82.330—.......... Runoff., . Runoff Depth>1.04".......... Flow Length •50' / MMMMMMMMMM MMMMMMMMMM MMMMMMMMMM 0 .1 . 2 3 .4' 5. 6 .7. 8 .9 10' 11 12 13 14.15 16 11. 13. 19 20 21 22 23.2 24 Time (hours) Rurwff Breezy Poa's Prepared by HP Inc. Type 11 24-hr 2-yr Rainfall=3.59" Printed 9/6/2022 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 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: Pre -Developed Site Runoff Area=82.330 ac 1.62% Impervious Runoff Depth>1.56" Flow Length=950' Tc=20.7 min CN=78 Runoff=138.23 cfs 10.683 of Subcatchment 2S: Post -Developed Site Runoff Area=82.330 ac 13.60% Impervious Runoff Depth>1.85" Flow Length=450' Tc=10.6 min CN=82 Runoff=226.36 cfs 12.710 of Subcatchment 3S: Pre -Developed Good Runoff Area=82.330 ac 0.00% Impervious Runoff Depth>1.49" Flow Length=950' Tc=20.7 min CN=77 Runoff=131.61 cfs 10.215 of Total Runoff Area = 246.990 ac Runoff Volume = 33.608 of Average Runoff Depth = 1.63" 94.93% Pervious = 234.460 ac 5.07% Impervious = 12.530 ac Breezy Poa's Prepared by HP Inc. Type 11 24-hr 2-yr Rainfall=3.59" Printed 9/6/2022 Summary for Subcatchment 1 S: Pre -Developed Site [47] Hint: Peak is 185% of capacity of segment #3 Runoff = 138.23 cfs @ 12.14 hrs, Volume= 10.683 af, Depth> 1.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr Rainfall=3.59" Area (ac) CN Description 69.000 77 Woods, Good, HSG D 12.000 84 50-75% Grass cover, Fair, HSG D 1.330 98 IMPERVIOUSNESS 82.330 78 Weighted Average 81.000 98.38% Pervious Area 1.330 1.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 1S: Pre -Developed Site Hydrograph Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type 11 24-hr 2-yr Rainfall=3.59" Printed 9/6/2022 Summary for Subcatchment 2S: Post -Developed Site Runoff = 226.36 cfs @ 12.02 hrs, Volume= 12.710 af, Depth> 1.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr Rainfall=3.59" Area (ac) CN 11.200 98 53.830 80 >75% Grass cover, Good, HSG D 17.300 77 Woods, Good, HSG D 82.330 82 Weighted Average 71.130 86.40% Pervious Area 11.200 13.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 150 0.0500 0.27 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 1.3 300 0.0650 3.82 Shallow Concentrated Flow, Shallow Concentrated Grassed Waterwav Kv= 15.0 fos 10.6 450 Total Subcatchment 2S: Post -Developed Site Hydrograph ■ Runoff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Breezy Poa's Prepared by HP Inc. Type 11 24-hr 2-yr Rainfall=3.59" Printed 9/6/2022 Summary for Subcatchment 3S: Pre -Developed Good Forested [47] Hint: Peak is 176% of capacity of segment #3 Runoff = 131.61 cfs @ 12.14 hrs, Volume= 10.215 af, Depth> 1.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-yr Rainfall=3.59" Area (ac) CN Description 82.330 77 Woods, Good, HSG D 82.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 3S: Pre -Developed Good Forested Hydrograph ■ Runoff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Breezy Poa's Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 9/6/2022 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 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: Pre -Developed Site Runoff Area=82.330 ac 1.62% Impervious Runoff Depth>3.06" Flow Length=950' Tc=20.7 min CN=78 Runoff=275.11 cfs 21.028 of Subcatchment 2S: Post -Developed Site Runoff Area=82.330 ac 13.60% Impervious Runoff Depth>3.46" Flow Length=450' Tc=10.6 min CN=82 Runoff=416.97 cfs 23.731 of Subcatchment 3S: Pre -Developed Good Runoff Area=82.330 ac 0.00% Impervious Runoff Depth>2.97" Flow Length=950' Tc=20.7 min CN=77 Runoff=266.73 cfs 20.386 of Total Runoff Area = 246.990 ac Runoff Volume = 65.145 of Average Runoff Depth = 3.17" 94.93% Pervious = 234.460 ac 5.07% Impervious = 12.530 ac Breezy Poa's Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 9/6/2022 Summary for Subcatchment 1 S: Pre -Developed Site [47] Hint: Peak is 369% of capacity of segment #3 Runoff = 275.11 cfs @ 12.14 hrs, Volume= 21.028 af, Depth> 3.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.43" Area (ac) CN Description 69.000 77 Woods, Good, HSG D 12.000 84 50-75% Grass cover, Fair, HSG D 1.330 98 IMPERVIOUSNESS 82.330 78 Weighted Average 81.000 98.38% Pervious Area 1.330 1.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 1S: Pre -Developed Site Hydrograph Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type/1 24-hr 10-yr Rainfall=5.43" Printed 9/6/2022 Summary for Subcatchment 2S: Post -Developed Site Runoff = 416.97 cfs @ 12.02 hrs, Volume= 23.731 af, Depth> 3.46" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.43" Area (ac) CN 11.200 98 53.830 80 >75% Grass cover, Good, HSG D 17.300 77 Woods, Good, HSG D 82.330 82 Weighted Average 71.130 86.40% Pervious Area 11.200 13.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 150 0.0500 0.27 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 1.3 300 0.0650 3.82 Shallow Concentrated Flow, Shallow Concentrated Grassed Waterwav Kv= 15.0 fos 10.6 450 Total 460= 440 300 280 260- 240 p 220= LL 200 Subcatchment 2S: Post -Developed Site Hydrograph • ,i i I 1 -------_----- i �' llllllllllllll� __ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Runoff Breezy Poa's Prepared by HP Inc. Type II 24-hr 10-yr Rainfall=5.43" Printed 9/6/2022 Summary for Subcatchment 3S: Pre -Developed Good Forested [47] Hint: Peak is 358% of capacity of segment #3 Runoff = 266.73 cfs @ 12.14 hrs, Volume= 20.386 af, Depth> 2.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.43" Area (ac) CN Description 82.330 77 Woods, Good, HSG D 82.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 3S: Pre -Developed Good Forested Hydrograph 1 1 1 1 1 1 1 1 1 1 1 1 1 /I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type 11 24-hr 50-yr Rainfall= 7.73 " Printed 9/6/2022 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 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: Pre -Developed Site Runoff Area=82.330 ac 1.62% Impervious Runoff Depth>5.12" Flow Length=950' Tc=20.7 min CN=78 Runoff=455.87 cfs 35.119 of Subcatchment 2S: Post -Developed Site Runoff Area=82.330 ac 13.60% Impervious Runoff Depth>5.59" Flow Length=450' Tc=10.6 min CN=82 Runoff=660.38 cfs 38.370 of Subcatchment 3S: Pre -Developed Good Runoff Area=82.330 ac 0.00% Impervious Runoff Depth>5.00" Flow Length=950' Tc=20.7 min CN=77 Runoff=446.56 cfs 34.333 of Total Runoff Area = 246.990 ac Runoff Volume = 107.821 of Average Runoff Depth = 5.24" 94.93% Pervious = 234.460 ac 5.07% Impervious = 12.530 ac Breezy Poa's Prepared by HP Inc. Type II 24-hr 50-yr Rainfall= 7.73 " Printed 9/6/2022 Summary for Subcatchment 1 S: Pre -Developed Site [47] Hint: Peak is 611 % of capacity of segment #3 Runoff = 455.87 cfs @ 12.13 hrs, Volume= 35.119 af, Depth> 5.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 50-yr Rainfall=7.73" Area (ac) CN Description 69.000 77 Woods, Good, HSG D 12.000 84 50-75% Grass cover, Fair, HSG D 1.330 98 IMPERVIOUSNESS 82.330 78 Weighted Average 81.000 98.38% Pervious Area 1.330 1.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total 500 480 460 440 420 400 380 360 340 320 300 w 280 u 260 p 240 LL 220 200 180 160 140 120 100 Bo 60 40 20 0 Subcatchment 1S: Pre -Developed Site Hydrograph @E� • • Runoff Depth>5.12" �1 07 min F �MMM MMM MMMMMMMMMMMM ■MMMMMMMMMMM ====I 'MMMMMMMMMMM ...................................................................................... 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type 11 24-hr 50-yr Rainfall= 7.73 " Printed 9/6/2022 Summary for Subcatchment 2S: Post -Developed Site Runoff = 660.38 cfs @ 12.02 hrs, Volume= 38.370 af, Depth> 5.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 50-yr Rainfall=7.73" Area (ac) CN 11.200 98 53.830 80 >75% Grass cover, Good, HSG D 17.300 77 Woods, Good, HSG D 82.330 82 Weighted Average 71.130 86.40% Pervious Area 11.200 13.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 150 0.0500 0.27 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 1.3 300 0.0650 3.82 Shallow Concentrated Flow, Shallow Concentrated Grassed Waterwav Kv= 15.0 fos 10.6 450 Total 0 LL Subcatchment 2S: Post -Developed Site Hydrograph I ME . = • , �g �-'■I ■■■■■■■■■■■■ MRO MIM , ME11719■■■I ■■■■■■■■■■■■ WIFIRIMMM■■■■■ .■■■■■■■■■■■ F."IMINOM■■■■ ■■■■■■■■■■■ N�WR■■■■■■ ■■■■■■■■i: ■■■■■■■■■■ to %0 MMMMMMMMM MMMMM 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ RunoH Breezy Poa's Prepared by HP Inc. Type 11 24-hr 50-yr Rainfall= 7.73 " Printed 9/6/2022 Summary for Subcatchment 3S: Pre -Developed Good Forested [47] Hint: Peak is 599% of capacity of segment #3 Runoff = 446.56 cfs @ 12.13 hrs, Volume= 34.333 af, Depth> 5.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 50-yr Rainfall=7.73" Area (ac) CN Description 82.330 77 Woods, Good, HSG D 82.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total 500 480 460 440 420 400 380 360 340 320 300 280 260 c 240 LL 220 200 180 160 140 120 100 80 60 40 20 0 Subcatchment 3S: Pre -Developed Good Forested Hydrograph =_v_mmm -- ROME 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 9/6/2022 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 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: Pre -Developed Site Runoff Area=82.330 ac 1.62% Impervious Runoff Depth>6.20" Flow Length=950' Tc=20.7 min CN=78 Runoff=549.05 cfs 42.545 of Subcatchment 2S: Post -Developed Site Runoff Area=82.330 ac 13.60% Impervious Runoff Depth>6.70" Flow Length=450' Tc=10.6 min CN=82 Runoff=784.18 cfs 46.002 of Subcatchment 3S: Pre -Developed Good Runoff Area=82.330 ac 0.00% Impervious Runoff Depth>6.08" Flow Length=950' Tc=20.7 min CN=77 Runoff=539.58 cfs 41.706 of Total Runoff Area = 246.990 ac Runoff Volume = 130.253 of Average Runoff Depth = 6.33" 94.93% Pervious = 234.460 ac 5.07% Impervious = 12.530 ac Breezy Poa's Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 9/6/2022 Summary for Subcatchment 1 S: Pre -Developed Site [47] Hint: Peak is 736% of capacity of segment #3 Runoff = 549.05 cfs @ 12.13 hrs, Volume= 42.545 af, Depth> 6.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=8.90" Area (ac) CN Description 69.000 77 Woods, Good, HSG D 12.000 84 50-75% Grass cover, Fair, HSG D 1.330 98 IMPERVIOUSNESS 82.330 78 Weighted Average 81.000 98.38% Pervious Area 1.330 1.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total Subcatchment 1S: Pre -Developed Site Hydrograph Time (hours) ■ Rurwff Breezy Poa's Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 9/6/2022 Summary for Subcatchment 2S: Post -Developed Site Runoff = 784.18 cfs @ 12.02 hrs, Volume= 46.002 af, Depth> 6.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=8.90" Area (ac) CN 11.200 98 53.830 80 >75% Grass cover, Good, HSG D 17.300 77 Woods, Good, HSG D 82.330 82 Weighted Average 71.130 86.40% Pervious Area 11.200 13.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 150 0.0500 0.27 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 1.3 300 0.0650 3.82 Shallow Concentrated Flow, Shallow Concentrated Grassed Waterwav Kv= 15.0 fos 10.6 450 Total Subcatchment 2S: Post -Developed Site Hydrograph ❑ RunoH 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Breezy Poa's Prepared by HP Inc. Type 1124-hr 100-yr Rainfall=8.90" Printed 9/6/2022 Summary for Subcatchment 3S: Pre -Developed Good Forested [47] Hint: Peak is 723% of capacity of segment #3 Runoff = 539.58 cfs @ 12.13 hrs, Volume= 41.706 af, Depth> 6.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=8.90" Area (ac) CN Description 82.330 77 Woods, Good, HSG D 82.330 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.6 150 0.0100 0.14 Sheet Flow, Existing Sheet Grass: Short n= 0.150 P2= 3.30" 2.8 300 0.0650 1.78 Shallow Concentrated Flow, Shallow Concentrated Short Grass Pasture Kv= 7.0 fps 0.3 500 0.1000 24.86 74.59 Channel Flow, Area= 3.0 sf Perim= 1.5' r= 2.00' n= 0.030 20.7 950 Total 60C 550 500 450 400 L_° 350 300 _o LL 250 200 150 100 50 Subcatchment 3S: Pre -Developed Good Forested Hydrograph PAV ■■■■■ �� ■■■■■■■■■■■ MEN MEN IIMMMMMM �■■■■■ 0 0 .1 . 2 3 .4' 5. 6 .7 . 8 . 9 .10 11 12 13 14 .15 16 17 18 19 20 21 22 23 . . 24 Time (hours) ■ Rurwff