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CITY OF BAKERSFIELD RATIONAL METHOD (In accordance with City of Bakersfield Standards) TABLE OF RUNOFF COEFFICIENTS R-1, 6000 SF 0.42 JOB TITLE:Bakersfield City School District R-1, 7500 SF 0.38 DATE:R-1, 10000 SF 0.34 REVISION DATE:R-1, 15000 SF 0.27 Rational Values:R-2 0.55 Event: 10 YEAR Values: 5, 10, 50 R-3, R-4, M-H 0.8 M.A.P. 6 in./yr. Values: 6, 10, 15, 20, 25, 30 Commercial 0.9 Industrial 0.8 Curve Values Parks 0.15 a: 2.38 I=a+bTc (Tc<20min.) Grasslands, Type A Soil 0.15 b: -0.058 Grasslands, Type B Soil 0.25 P60: 0.550 I=K1*(6.02*Tc)^(0.17*LN(p60/K1) Grasslands, Type C Soil 0.35 K1: 40.00 (Tc>=20min.) Grasslands, Type D Soil 0.45 Pavement, drives & roofs 0.95 Backyards 0.05 Lawn-landscape 2% slope 0.10 0.17 Lawn-landscape 2-7% slope 0.15 0.22 Lawn-landscape 7% slope 0.20 0.35 SUBAREA C I A Rslt Tc L dH Q V Trial Tc Roof to Tm D NAME Runoff Intensity Total Time Length Elev. Flow Vel. MIN. Gutter Travel Pipe Coef.(in./hr.)Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. AC. MIN. Feet % MIN. MIN. In. PIPE FLOW CALCULATIONS AREA 1 0.88 1.80 0.07 10.00 0.11 2.00 10.00 10 0.00 AREA 1 to DI #2 107 0.11 0.56 3.16 6 13.16 AREA 2 0.40 1.80 0.25 10.00 116 1.88 1.62%0.18 2.00 10.00 0 0.97 DI #2 to DI #5 0.51 1.62 0.32 83 0.26 0.75 13.16 1.85 8 15.01 AREA 3 0.95 1.80 0.07 10.00 0.12 2.00 10.00 10 0.00 AREA 3 to MH #1 106 0.12 0.61 2.90 6 12.90 AREA 4 0.31 1.80 0.07 10.00 0.04 2.00 10.00 10 0.00 AREA 4 to MH #1 31 0.04 0.20 2.60 6 12.60 MH #1 to DI #5 0.63 1.63 0.14 26 0.14 0.73 12.90 0.59 6 13.49 AREA 5 0.48 1.80 0.27 10.00 137 5.14 3.75%0.23 2.00 10.00 0 1.14 DI #5 to MH #2 0.52 1.51 0.73 29 0.57 1.64 15.01 0.29 8 15.30 AREA 6 0.80 1.80 0.51 10 0.73 2.00 10.00 0 0.00 DI #6 to DI #7 34 0.73 0.94 0.61 12 10.61 AREA 7 0.56 1.80 1.52 10.00 1.53 2.00 10.00 0 0.00 DI #7 to MH #2 0.62 1.76 2.03 94 2.22 2.83 10.61 0.55 12 11.16 MH #2 to DI #12 0.59 1.49 2.76 131 2.44 3.11 15.30 0.70 12 16.00 April 18, 2011 P:\PROJECTS\10021\Studies\DRAINAGE\MAL-10021ds01.xls Page 1 SUBAREA C I A Rslt Tc L dH Q V Trial Tc Roof to Tm D NAME Runoff Intensity Total Time Length Elev. Flow Vel. MIN. Gutter Travel Pipe Coef.(in./hr.)Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. AC. MIN. Feet % MIN. MIN. In. AREA 8 0.95 1.80 0.03 10.00 0.05 2.00 10.00 10 0.00 AREA 8 to DI #9 67 0.05 0.59 1.90 4 11.90 AREA 9 0.82 1.80 0.11 10.00 0.16 2.00 10.00 10 0.00 DI #9 to DI #10 0.85 1.69 0.14 57 0.20 0.57 11.90 1.65 8 13.55 AREA 10 0.46 1.80 0.10 10.00 0.08 2.00 10.00 0 0.00 DI #10 to DI #11 0.69 1.59 0.24 34 0.26 0.75 13.55 0.75 8 14.31 AREA 11 0.64 1.80 1.12 10.00 1.29 2.00 10.00 0 0.00 DI #11 to DI #12 0.65 1.55 1.36 26 1.37 1.74 14.31 0.25 12 14.56 AREA 12 0.74 1.80 0.32 10.00 0.43 2.00 10.00 0 0.00 DI #12 to DI #17 0.62 1.45 4.44 232 4.00 2.26 16.00 1.71 18 17.71 AREA 13 0.95 1.80 0.13 10.00 0.22 2.00 10.00 10 0.00 AREA 13 to DI #16 151 0.22 1.13 2.22 6 12.22 AREA 14 0.95 1.80 0.13 10.00 0.22 2.00 10.00 10 0.00 AREA 14 to MH #3 115 0.22 1.13 1.69 6 11.69 AREA 15 0.90 1.80 0.15 10.00 0.24 2.00 10.00 10 0.00 AREA 15 to MH #3 144 0.24 1.24 1.94 6 11.94 MH #3 to DI #16 0.92 1.69 0.28 36 0.44 1.25 11.94 0.48 8 12.42 AREA 16 0.20 1.80 0.19 10.00 0.07 2.00 10.00 0 0.00 DI #16 to DI #17 0.70 1.66 0.60 33 0.70 2.00 12.42 0.28 8 12.69 AREA 17 0.75 1.80 0.27 10.00 0.36 2.00 10.00 0 0.00 DI #17 to MH #4 0.64 1.35 5.31 89 4.57 2.58 17.71 0.57 18 18.29 Offsite from West 0.00 1.15 0.00 21.58 0.00 2.00 21.58 0 0.00 MH #4 to MH #7 0.64 1.15 5.31 213 3.90 0.40 21.58 8.77 42 30.35 AREA 18 0.95 1.80 0.25 10.00 0.43 2.00 10.00 10 0.00 AREA 18 to DI #19 147 0.43 1.22 2.00 8 12.00 AREA 19 0.95 1.80 0.14 10.00 0.24 2.00 10.00 10 0.00 DI #19 to DI #24 0.95 1.68 0.39 179 0.62 1.79 12.00 1.67 8 13.67 P:\PROJECTS\10021\Studies\DRAINAGE\MAL-10021ds01.xls Page 2 SUBAREA C I A Rslt Tc L dH Q V Trial Tc Roof to Tm D NAME Runoff Intensity Total Time Length Elev. Flow Vel. MIN. Gutter Travel Pipe Coef.(in./hr.)Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. AC. MIN. Feet % MIN. MIN. In. AREA 20 0.95 1.80 0.05 10.00 0.09 2.00 10.00 10 0.00 AREA 20 to DI #21 44 0.09 0.98 0.75 4 10.75 AREA 21 0.95 1.80 0.14 10.00 0.24 2.00 10.00 10 0.00 DI #21 to MH #5 0.95 1.76 0.19 104 0.32 0.91 10.75 1.91 8 12.66 AREA 22 0.90 1.80 0.03 10.00 0.05 2.00 10.00 0 0.00 AREA 22 to MH #5 63 0.05 0.56 1.89 4 11.89 MH #5 to DI #23 0.94 1.65 0.22 10 0.34 1.74 12.66 0.10 6 12.75 AREA 23 0.95 1.80 0.03 10.00 0.05 2.00 10.00 10 0.00 DI #23 to DI #24 0.94 1.64 0.25 50 0.39 1.97 12.75 0.42 6 13.18 AREA 24 0.47 1.80 0.19 10.00 0.16 2.00 10.00 0 0.00 DI #24 to DI #25 0.84 1.59 0.83 81 1.10 1.41 13.67 0.96 12 14.63 AREA 25 0.61 1.80 0.20 10.00 0.22 2.00 10.00 10 0.00 DI #25 to DI #30 0.79 1.53 1.03 54 1.25 1.59 14.63 0.56 12 15.20 AREA 26 0.95 1.80 0.13 10.00 0.22 2.00 10.00 10 0.00 AREA 26 to DI #27 76 0.22 1.13 1.12 6 11.12 AREA 27 0.35 1.80 0.20 10.00 0.13 2.00 10.00 0 0.00 DI #27 to DI #28 0.59 1.73 0.33 54 0.34 0.96 11.12 0.94 8 12.05 AREA 28 0.85 1.80 0.38 10.00 0.58 2.00 10.00 10 0.00 DI #28 to DI #29 0.73 1.68 0.71 75 0.87 1.11 12.05 1.13 12 13.19 AREA 29 0.68 1.80 0.14 10.00 0.17 2.00 10.00 10 0.00 DI #29 to DI #30 0.72 1.61 0.85 84 0.99 1.26 13.19 1.11 12 14.30 AREA 30 0.58 1.80 0.14 10.00 0.15 2.00 10.00 0 0.00 DI #30 to DI #31 0.75 1.50 2.02 41 2.26 2.88 15.20 0.24 12 15.43 AREA 31 0.82 1.80 0.12 10.00 0.18 2.00 10.00 10 0.00 DI #31 to DI #33 0.75 1.48 2.14 79 2.39 3.04 15.43 0.43 12 15.87 P:\PROJECTS\10021\Studies\DRAINAGE\MAL-10021ds01.xls Page 3 SUBAREA C I A Rslt Tc L dH Q V Trial Tc Roof to Tm D NAME Runoff Intensity Total Time Length Elev. Flow Vel. MIN. Gutter Travel Pipe Coef.(in./hr.)Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. AC. MIN. Feet % MIN. MIN. In. AREA 32 0.95 1.80 0.09 10.00 0.15 2.00 10.00 10 0.00 AREA 32 to DI #33 60 0.15 0.78 1.28 6 11.28 AREA 33 0.95 1.80 0.11 10.00 0.19 2.00 10.00 0 0.00 DI #33 to DI #34 0.77 1.46 2.34 38 2.62 1.48 15.87 0.43 18 16.29 AREA 34 0.95 1.80 0.26 10.00 0.44 2.00 10.00 10 0.00 DI #34 to DI #35 0.79 1.43 2.60 144 2.93 1.66 16.29 1.45 18 17.74 AREA 35 0.89 1.80 0.12 10.00 0.19 2.00 10.00 0 0.00 DI #35 to DI #40 0.79 1.35 2.72 102 2.91 1.64 17.74 1.03 18 18.77 AREA 36 0.95 1.80 0.13 10.00 0.22 2.00 10.00 10 0.00 AREA 36 to DI #37 116 0.22 1.13 1.71 6 11.71 AREA 37 0.95 1.80 0.09 10.00 0.15 2.00 10.00 10 0.00 DI #37 to DI #38 0.95 1.70 0.22 101 0.36 1.81 11.71 0.93 6 12.64 AREA 38 0.89 1.80 0.12 10.00 0.19 2.00 10.00 0 0.00 DI #38 to MH #6 0.93 1.65 0.34 7 0.52 2.65 12.64 0.04 6 12.68 AREA 39 0.95 1.80 0.25 10.00 0.43 2.00 10.00 10 0.00 AREA 39 to MH #6 131 0.43 2.18 1.00 6 11.00 MH #6 to DI #40 0.94 1.74 0.59 68 0.96 2.76 11.00 0.41 8 11.41 AREA 40 0.58 1.80 0.82 10.00 0.86 2.00 10.00 0 0.00 DI #40 to MH #7 0.77 1.29 4.13 34 4.10 2.32 18.77 0.24 18 19.02 MH #7 to DI #75 0.70 0.90 9.44 960 5.90 0.61 30.35 26.09 42 56.44 AREA 51 0.95 1.80 0.05 10.00 0.09 2.00 10.00 10 0.00 AREA 51 to DI #52 151 0.09 0.44 5.78 6 15.78 AREA 52 0.95 1.80 0.04 10.00 0.07 2.00 10.00 10 0.00 DI #52 to DI #53 0.95 1.46 0.09 23 0.13 0.64 15.78 0.60 6 16.38 AREA 53 0.79 1.80 0.09 10.00 0.13 2.00 10.00 10 0.00 DI #53 to MH #8 0.87 1.43 0.18 77 0.22 0.64 16.38 2.00 8 18.38 P:\PROJECTS\10021\Studies\DRAINAGE\MAL-10021ds01.xls Page 4 SUBAREA C I A Rslt Tc L dH Q V Trial Tc Roof to Tm D NAME Runoff Intensity Total Time Length Elev. Flow Vel. MIN. Gutter Travel Pipe Coef.(in./hr.)Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. AC. MIN. Feet % MIN. MIN. In. AREA 54 0.95 1.80 0.15 10.00 0.26 2.00 10.00 10 0.00 AREA 54 to MH #8 153 0.26 1.31 1.95 6 11.95 MH #8 to DI #59 0.91 1.31 0.33 32 0.39 1.12 18.38 0.47 8 18.86 AREA 55 0.81 1.80 0.16 10.00 0.23 2.00 10.00 10 0.00 DI #55 to DI #56 38 0.23 0.67 0.95 8 10.95 AREA 56 0.91 1.80 0.18 10.00 0.29 2.00 10.00 10 0.00 DI #56 to DI #57 0.86 1.74 0.34 34 0.51 1.47 10.95 0.39 8 11.33 AREA 57 0.74 1.80 0.15 10.00 0.20 2.00 10.00 10 0.00 DI #57 to DI #59 0.83 1.72 0.49 62 0.70 2.00 11.33 0.52 8 11.85 AREA 58 0.95 1.80 0.19 10.00 0.32 2.00 10.00 10 0.00 AREA 58 to DI #59 85 0.32 1.65 0.86 6 10.86 AREA 59 0.76 1.80 0.20 10.00 0.27 2.00 10.00 0 0.00 DI #59 to DI #60 0.86 1.28 1.21 246 1.33 1.69 18.86 2.42 12 21.28 AREA 60 0.37 1.80 0.58 10.00 0.39 2.00 10.00 0 0.00 DI #60 to MH #9 0.70 1.16 1.79 21 1.46 1.85 21.28 0.19 12 21.47 AREA 61 0.65 1.80 0.05 10.00 0.06 2.00 10.00 10 0.00 DI #61 to DI #62 48 0.06 0.30 2.69 6 12.69 AREA 62 0.39 1.80 0.04 10.00 0.03 2.00 10.00 0 0.00 DI #62 to MH #9 0.53 1.64 0.09 19 0.08 0.40 12.69 0.79 6 13.47 MH #9 to DI #63 0.69 1.16 1.88 34 1.50 1.91 21.47 0.30 12 21.76 AREA 63 0.92 1.80 0.24 10.00 0.40 2.00 10.00 10 0.00 DI #63 to DI #64 0.72 1.15 2.12 105 1.74 2.22 21.76 0.79 12 22.55 AREA 64 0.95 1.80 0.28 10.00 0.48 2.00 10.00 10 0.00 DI #64 to DI #65 0.74 1.12 2.40 72 1.99 2.54 22.55 0.47 12 23.02 AREA 65 0.95 1.80 0.19 10.00 0.32 2.00 10.00 10 0.00 DI #65 to DI #66 0.76 1.10 2.59 72 2.16 2.75 23.02 0.44 12 23.46 P:\PROJECTS\10021\Studies\DRAINAGE\MAL-10021ds01.xls Page 5 SUBAREA C I A Rslt Tc L dH Q V Trial Tc Roof to Tm D NAME Runoff Intensity Total Time Length Elev. Flow Vel. MIN. Gutter Travel Pipe Coef.(in./hr.)Area Conc. Feet Diff. Slope CFS FPS Time Time Dia. AC. MIN. Feet % MIN. MIN. In. AREA 66 0.95 1.80 0.12 10.00 0.21 2.00 10.00 10 0.00 DI #66 to MH #11 0.77 1.08 2.71 73 2.26 2.87 23.46 0.42 12 23.88 AREA 67 0.79 1.80 0.51 10.00 0.73 2.00 10.00 0 0.00 DI #67 to MH #10 40 0.73 0.92 0.72 12 10.72 AREA 68 0.74 1.80 0.18 10.00 0.24 2.00 10.00 0 0.00 DI #68 to MH #10 42 0.24 0.69 1.02 8 11.02 MH #10 to DI #69 0.78 1.74 0.69 70 0.93 1.19 11.02 0.98 12 12.00 AREA 69 0.95 1.80 0.25 10.00 0.43 2.00 10.00 10 0.00 DI #69 to MH #11 0.82 1.68 0.94 418 1.30 1.66 12.00 4.20 12 16.20 MH #11 to MH #12 0.78 1.07 3.65 106 3.06 3.89 23.88 0.45 12 24.34 AREA 70 0.95 1.80 0.19 10.00 0.32 2.00 10.00 10 0.00 AREA 70 to MH #12 300 0.32 0.93 5.37 8 15.37 MH #12 to MH #13 0.79 1.06 3.84 312 3.20 1.81 24.34 2.87 18 27.21 AREA 71 0.32 1.25 8.88 19.48 1137 3.55 2.00 19.48 10 9.48 AREA 71 to MH #13 275 3.55 2.01 2.28 18 21.76 MH #13 to DI #72 0.46 0.97 12.72 15 5.72 3.24 27.21 0.08 18 27.28 AREA 72 0.86 1.52 1.13 14.83 579 1.48 2.00 14.83 10 4.83 DI #72 to DI #73 0.49 0.97 13.85 90 6.65 3.77 27.28 0.40 18 27.68 AREA 73 0.82 1.50 1.50 15.17 620 1.84 2.00 15.17 10 5.17 DI #73 to DI #74 0.53 0.96 15.35 469 7.77 4.39 27.68 1.78 18 29.46 AREA 74 0.26 1.80 6.46 10.00 815 3.02 2.00 10.00 0 6.79 DI #74 to DI #75 0.45 0.92 21.81 262 8.97 2.85 29.46 1.53 24 30.99 AREA 75 0.40 1.80 6.45 10.00 788 4.64 2.00 10.00 0 6.57 DI #75 to Ex. System 0.50 0.89 37.70 0 16.74 1.74 30.99 0.00 42 30.99 P:\PROJECTS\10021\Studies\DRAINAGE\MAL-10021ds01.xls Page 6