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DRAINAGE COMPUTATIONS TRIBUTARY RUNOFF TIME OF REQUIRED DESIGN EXISTING SEWER LOCATION PROFILE AREA COEFFICIENT CONCENTRATION CAPACITY n= 0.012 CAPACITY A ΣA IN CHANNEL Tc i q D V Qfull LENGTH s Q % DRAINAGE AREAS FROM TO C CA ΣCA Drop Invert Rim Cover (ac) (ac) (sec) (min) (min) (in/hr) (cfs) (in) (fps) (cfs) (ft) (%) (cfs) REQ'D DA 4 RCVR 4 RCVR 5 0.08 0.08 0.80 0.06 0.06 9.77 0.16 5.00 5.28 0.34 8 2.25 0.83 22 0.40% 0.09 901.13 903.24 1.45 DA 5 RCVR 5 Swale 0.05 0.13 0.80 0.04 0.10 35.19 0.59 5.16 5.22 0.54 8 2.53 0.83 89 0.40% 0.36 901.04 903.54 1.83 DA 6 Swale RCVR 1 0.16 0.29 0.60 0.10 0.20 12.11 0.20 15.00 3.36 0.67 8 2.64 0.83 32 0.40% 0.13 900.68 DA 1 RCVR 1 RCVR 2 0.06 0.35 0.80 0.05 0.25 21.82 0.36 15.20 3.34 0.83 8 2.70 0.83 59 0.40% 0.24 900.56 903.51 2.29 DA 3 RCVR 3 RCVR 2 0.15 0.15 0.80 0.12 0.12 14.92 0.25 5.00 5.28 0.63 8 2.61 0.83 39 0.40% 0.16 900.48 903.65 2.51 DA 2 RCVR 2 Ex RCVR 0.01 0.51 0.80 0.01 0.38 16.88 0.28 15.57 3.30 1.24 8 4.27 1.31 72 1.00% 0.72 900.32 904.11 3.12 LOCATION: 359 Quaker Road COMPUTED BY: JJS DATE: 12/18/25 SHEET 1 CHECKED BY: DATE: OF 1