2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D 10-Year Rainfall=5.22" 2025-01 HydroCAD NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 2/21/2025 Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 32 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 33 Summary for Subcatchment 4S: Proposed Pervious Subcatchment 4S: Proposed Pervious Hydrograph [49] Hint: Tc<2dt may require smaller dt oof | Runoff = 0.83 cis@ 12.11 hrs, Volume= 0.058 af, Depth= 2.37" oss} | Routed to Link 6L : Proposed Total ost’ 075 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs o7 NOAA 24-hrD 10-Year Rainfall=5.22" oes o5y | Area (sf) CN Description oss | 2,096 61 >75% Grass cover, Good, HSG B S os} 9,762 74 >75% Grass cover, Good, HSG C 3 045 83380 __>75% Grass cover, Good, HSG D Eos 12,691 72 Weighted Average oss | 12,691 10.00% Pervious Area oa} | ee Tc Length Slope Velocity Capacity Description o2h |. (min) (feet) _(ft/ft) (ft/sec) (cfs) ond” 31 21 0.0150 0.11 ‘Sheet Flow, Sheet Flow - AB on Grass: Short n= 0.150 P2= 3.35" 0.08: Os 43 0.0300 1.40 Sheet Flow, Sheet Flow - BC ¥) . Smooth sufanes ne 0011 P2= 3.36" OPES ESET eS WHAM ETT wi wa a OM 2 22728 2m 0.3 35 0.0082 1.84 Shallow Concentrated Flow, SCF - CD Paved Kv= 20.3 fps o4 59 0.0252 8.51 «6,68 Pipe Channel, Pipe Flow - DE 12.0" Round Area= 0.8 sf Perim= 3.1" r= 0.25! n= 0.011 Concrete pipe, straight & clean 0.2 111 0.0300 9.29 7.29 Pipe Channel, Pipe Flow - EF 12.0" Round Area= 0.8 sf Perim= 3.1' r=0.25' n= 0.011 Concrete pipe, straight & clean 0.1 48 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - FG 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25" n= 0.011 Concrete pipe, straight & clean of 26 0.0200 7.58 + —-5.95_ Pipe Channel, Pipe Flow - GH 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25! n= 0.011 Concrete pipe, straight & clean 0.0 27 =0.0300 10.78 13.22 Pipe Channel, Pipe Flow - HI 15.0" Round Area= 1.2 sf Perim=3.9' r=0.31' n= 0.011 Concrete pipe, straight & clean 44 370 Total