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Seattle,Washington <br /> It = A , , www.pacland.com <br /> T 206.522.9510 <br /> 1111 <br /> TURNING VISIONS INTO REALITY <br /> Rational Method Summation of Catch Basin Sub-Basins Table <br /> 25-year Open- <br /> LowerTotal <br /> Upper CB/ Flow Upstream Pipe Pipe Pipe Channel Pipe <br /> Pipe Structure I CB/ from Flow Flow <br /> Size Slope Roughne Pipe Capacity <br /> Sub basin Structur Sub- Thru <br /> Thru(cfs) pipe (in.) (in/in) ss(n) Capacity Check <br /> e basin Pipe (cfs) <br /> (cfs) <br /> 8 8 9 0.63 0.00 0.63 8 0.005 0.012 0.93 OK <br /> 9 9 10 0.76 0.63 1.39 12 0.005 0.012 2.74 OK <br /> 10 10 11 0.42 1.39 1.82 12 0.005 0.012 2.74 OK <br /> 11 11 12 0.00 1.82 1.82 12 0.005 0.012 2.74 OK <br /> 12 12 13 0.15 1.82 1.96 12 0.005 0.012 2.74 OK <br /> 13 13 14 0.24 7.79 8.04 24 0.005 0.012 17.38 OK <br /> 14 14 15 0.26 8.04 8.29 24 0.005 0.012 17.38 OK <br /> 15 15 16 0.16 8.29 8.45 24 0.005 0.012 17.38 OK <br /> 16 16 17 0.00 8.45 8.45 24 0.005 0.012 17.38 OK <br /> 17 11 17 0.00 8.45 8.45 24 0.005 0.012 17.38 OK <br /> 18 18 19 1.66 0.00 1.66 12 0.005 0.012 2.74 OK <br /> 19 19 20 0.55 1.66 2.21 12 0.005 0.012 2.74 OK <br /> 20 20 21 0.55 2.21 4.51 15 0.005 0.012 4.96 OK <br /> 21 N/A 5 0.00 4.51 4.51 15 0.005 0.012 4.96 OK <br /> 22 22 2 1.15 0.00 1.15 12 0.005 0.012 2.74 OK <br /> 23 23 20 1.15 1.15 2.30 12 0.005 0.012 2.74 OK <br /> 30 30 32 5.83: . 0.00. 5.83 18 0.005 0.012 8.07 OK <br /> Storm Intensity Runoff Coefficients Mannings Equation <br /> 3.07 25-year T=5 min 0.9 Pavement and Roof <br /> 0.25 Lawns <br /> intensity recurrence m n T <br /> 1.51 2 3.69 0.556 5 <br /> 2.08 5 5.2 0.57 5 <br /> 2.50 10 6.31 0.575 5 <br /> 3.07 25 7.83 0.582 5 <br /> 3.49 50 8.96 0.585 5 <br /> 3.92 100 10.07 0.586 5 <br /> Everett Mall Plaza Parcel Ill Retail Expansion Stormwater Site Plan - Page 39 <br />