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MSE 24-hr 3 10-Year Rainfall=4.26"24021_Idyllvale_PR <br /> Printed 10/23/2024Prepared by Civil Methods, Inc. <br />Page 17HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC <br />Volume Invert Avail.Storage Storage Description <br />#1 952.00'9,255 cf Custom Stage Data (Prismatic) Listed below (Recalc) <br />Elevation Surf.Area Inc.Store Cum.Store <br />(feet)(sq-ft)(cubic-feet)(cubic-feet) <br />952.00 1,250 0 0 <br />953.00 1,783 1,517 1,517 <br />955.00 2,970 4,753 6,270 <br />956.00 3,000 2,985 9,255 <br />Device Routing Invert Outlet Devices <br />#1 Discarded 952.00'0.250 in/hr Exfiltration over Surface area <br />#2 Primary 950.00'8.0" Round Culvert L= 30.0' Ke= 0.500 <br />Inlet / Outlet Invert= 950.00' / 949.80' S= 0.0067 '/' Cc= 0.900 <br />n= 0.013, Flow Area= 0.35 sf <br />#3 Device 2 953.00'12.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />#4 Secondary 954.80'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) <br />Head (feet) 0.00 0.50 <br />Width (feet) 4.00 8.00 <br />Discarded OutFlow Max=0.01 cfs @ 12.23 hrs HW=953.52' (Free Discharge) <br />1=Exfiltration (Exfiltration Controls 0.01 cfs) <br />Primary OutFlow Max=2.74 cfs @ 12.23 hrs HW=953.52' TW=0.00' (Dynamic Tailwater) <br />2=Culvert (Passes 2.74 cfs of 2.77 cfs potential flow) <br />3=Orifice/Grate (Orifice Controls 2.74 cfs @ 3.48 fps) <br />Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=952.00' TW=0.00' (Dynamic Tailwater) <br />4=Custom Weir/Orifice ( Controls 0.00 cfs) <br />MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR <br /> Printed 10/23/2024Prepared by Civil Methods, Inc. <br />Page 18HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC <br />Summary for Subcatchment P1: Proposed to Basin <br />Runoff =28.52 cfs @ 12.26 hrs, Volume=2.106 af, Depth= 4.74" <br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs <br />MSE 24-hr 3 100-Year Rainfall=7.32" <br />Area (ac) CN Description <br />*1.429 98 <br />0.344 74 >75% Grass cover, Good, HSG C <br />3.556 70 Woods, Good, HSG C <br />5.329 78 Weighted Average <br />3.900 70 73.18% Pervious Area <br />1.429 98 26.82% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet)(ft/ft) (ft/sec)(cfs) <br />10.4 100 0.0200 0.16 Sheet Flow, <br />Grass: Short n= 0.150 P2= 2.86" <br />7.3 650 0.0880 1.48 Shallow Concentrated Flow, <br />Woodland Kv= 5.0 fps <br />17.7 750 Total <br />Summary for Subcatchment P2: Proposed to Basin <br />Runoff =4.08 cfs @ 12.15 hrs, Volume=0.218 af, Depth= 5.36" <br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs <br />MSE 24-hr 3 100-Year Rainfall=7.32" <br />Area (ac) CN Description <br />*0.184 98 <br />0.304 74 >75% Grass cover, Good, HSG C <br />0.488 83 Weighted Average <br />0.304 74 62.30% Pervious Area <br />0.184 98 37.70% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet)(ft/ft) (ft/sec)(cfs) <br />8.0 Direct Entry, <br />Summary for Subcatchment P2A: Direct <br />Runoff =16.55 cfs @ 12.20 hrs, Volume=0.961 af, Depth= 3.94" <br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs <br />MSE 24-hr 3 100-Year Rainfall=7.32" <br />166