2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D. 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 48 2025-01 HydroCAD Prepared by Dynamic Engineering HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 2/21/2025 Page 49 Summary for Subcatchment 4S: Proposed Pervious [49] Hint: To<2dt may require smaller dt Runoff = 1.83 cfs @ 12.11 hrs, Volume= Routed to Link 6L : Proposed Total 0.128 af, Depth= 5.28" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf)_CN Description 2,096 61 _>75% Grass cover, Good, HSG B 9,762 74 >75% Grass cover, Good, HSG C 833, 80 _>75% Grass cover, Good, HSG D 12,691 72 Weighted Average 12,691 100.00% Pervious Area Te Length Slope Velocity Capacity Description (min) (feet) (ft) _ (ft/sec) (cfs) 34 21 00150 0.11 Sheet Flow, Sheet Flow - AB Grass: Short n= 0.150 P2=3.35" Sheet Flow, Sheet Flow - BC Smooth surfaces n= 0.011 P2=3.35" Shallow Concentrated Flow, SCF - CD Paved Kv= 20.3 fps. O41 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' 0.011 Conorete pipe, straight & clean 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 04 48 00200 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 4 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 0s 43 0.0300 1.40 03 35 0.0082 1.84 02 111 0.0300 9,29 7.29 44 370 Total Subcatchment 4S: Proposed Pervious Hydrograph | NOAA 24-hr D 100-Year Rainfall=8.66" Toue te et? We 19 20 21 22 22 24 25 26 27 28 20 20 Time (hours)