2022 08 Drainage Report

2022-07-21 Existing Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" 2022-07-21 Existing Hydrology NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 8/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 9 “AD® 10.20-2d_ sin 08640 © 2021 Hi) “AD Software Solutions LLC Pi 1 Hydrograph for Subcatchment 1S: Mt. Pleasant Ave. - Imp. ‘Summary for Subcatchment 3S: Mt. Pleasant Ave. - Perv. Time Precip. Excess Runoff | Time Precip. Excess Runoff Runoff = 2.21 ofs@ 12.38 hrs, Volume= 0.295 af, Depth= 0.97" inches) (Inches) (cfs) Routed to Link 2L : Mt, Pleasant Ave. 52.00 3.44 3.21 0.00 Bed 4 2 naa Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs cam aaa eat eo NOAA 24-hrD 2-Year Rainfali=3.44’ 56.00 344 3.21 0.00 : 87.00 344 3.21 0.00 Area (sf)__CN Description 58.00 344 3.21 0,00 155,762 70 Woods, Good, HSG G 59.00 344 3.21 0,00 2,359 77 Woods, Good, HSG D Sung oan aor ae 749 74__>75% Grass cover, Good, HSG C r . 24 . 158,870 70 Weighted Average 62,00 3.44 3.21 0.00 ? he ean! aaa! St ae 158,870 10.00% Pervious Area Seep anes sal ne To Length Slope Velocity Capacity Description 66.00 344 3.21 0.00 (min) __(feet)__(fft) __(f'sec) (cfs) 6700 3443.21 0.00 242 100 0.0135 0.07 ‘Shoot Flow, Sheet Flow (AB) 68.00 3443.21 0.00 : Light underbrush n= 0.400 P2= 3.44" 69,00 344 3.21 0.00 06 145 0.0872 4.17 Shallow Concentrated Flow, SCF - Unpaved (BC) 70.00 3.44 3.21 0.00 Unpaved Kv= 16.1 fps 71.00 3.44 3.21 0,00 24.8 245 Total 72.00 3.44 3.21 0.00 - Subcatchment 3S: Mt. Pleasant Ave. - Per Hydrograph = NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=158,870 sf Runoff Volume=0.295 af g Runoff Depth=0.97" i Flow Length=245' Tc=24.8 min CN=70 O24 G8 WO iets Wo Toad eM 2 2890323 3838404244 A0 860 2 EH 80 98.0 621468 697072 Time (hours