Loading...
HomeMy WebLinkAboutSW6220401_Design Calculations_20220621 (9)DESIGN REQUIREMENTS: A. Post development discharge < or = Predevelopment discharge Drainage Area, (DA) _ Intensity, (I) _ Composite Runoff Coefficient, (C) _> Maximum Release Rate, (Q10) _> Drainage Area, (DA) _ Intensity, (I) _ Composite Runoff Coefficient, (C) _> Peak Release Rate, (Q10) _> 1.50 acres 7.54 inches/hr 0.30 3.39 cfs r� 2.26 acres 7.54 inches/hr 0.78 13.29 cfs Contour Contour Incr. Accum. Stage Elev. Area Storage Storage (S) (Z) 00 (sf) (cf) (cf) 00 In (S) In (Z) Z est 321.0 16,000 - - 321.0 5,046 11 11 0.00 2.35 -6.91 0.00 321.5 6,326 2,843 2,854 0.50 7.96 0.69 0.52 322.0 6,987 3,328 6,182 1.00 8.73 0.00 0.99 322.5 7,662 3,662 9,844 1.50 € 9.19 0.41 1.47 323.0 8,352 4,004 13,848 2.00 9.54 0.69 1.96 323.5 9,055 4,352 18,199 2.50 € 9.81 0.92 2.47 324.0 9,773 4,707 22,906 3.00 10.04 1.10 3.00 324.5 10,505 5,070 27,976 3.50 10.24 1.25 3.55 325.0 11,251 5,439 33,415 4.00 € 10.42 € 1.39 4.12 Regression Output: b= 1.18 (X Variable Coeff) Ks- 6,255 (eY-i ter-pt) Stage - Storage Equation is of the form: S = (Ks)(Z)b printed: 6/21/2022 7:12 AM Page 1 of 3 Barrel Number of Barrels = Dia. of Barrel = Area of Barrel, (Ab) _ Pipe Length, (L) _ Friction Coeff, (Kp) _ Inv. of Barrel = Riser Elev. of Riser Crest Rectangular Length Weir— 36 inches Total Weir Length= Area of Riser = Orifice in Riser Dia. of Orifice = Number of Orifices = Area of Orifice, (Ab) _ Orifice Coefficient (Cd) _ Inv. of Orifice = Length of weir — Top of weir — Weir Coefficient (Cw)— Width of Spillway (Approx.) _ Weir Coefficient = Crest Elevation = Maximum Release Rate, (Q10) _ Release Rate, (Q10) _ Normal Water Surface Elev. _ 1 30 inches 4.91 sf 46 feet 0.00786 305.15 feet 323.65 feet Width Weir— 48 inches 14.00 feet 12.00 sq. ft. 1.50 inches 1 0.01 sf 0.60 321.00 feet 0.55 feet 322.06 feet 3.00 15 feet 3.3 324.00 feet 3.39 cfs 3.33 cfs 321.00 feet Water Surface Elev. @ Outlet (Qlo) = 323.63 feet printed: 6/21/2022 7:12 AM Page 2 of 3 Peak Inflow, (Qp) => Time to Peak Calculation: CN= Q*= vo1= Time to Peak, (Tp) _> (SCS TR-55) 13.29 cfs 82 P= 5.23 in. 3.29 in. (depth of runoff) 17,890 cf (vol. of runoff) 24.3 minutes S= 2.20 in. printed: 6/21/2022 7:12 AM Page 3 of 3