Storm sewers need to be installed in a new development. Four inlets are proposed with pipes running from inlet A to B, then to C, and finally to D. Data associated with each pipe and inlet are listed below. The size all of the pipes, assuming that rainfall intensity, can be described by the equation i = 150/(t_d + 20). Use the following standard pipe sizes: 38. 1

(minimum), 45. 72, 53. 34, 60. 96, 76. 2, 91. 44 cm, and so on.

Inlet A: drainage area = 12,000 m2, t₀ = 10 min, C = 0. 30 Inlet B: drainage area = 16,000 m², t₀ = 12 min, C = 0. 40 Inlet A: drainage area = 8000 m², t₀ = 10 min, C = 0. 50 Inlet A: drainage area = 8000 m², t₀ = 10 min, C = 0. 30 Pipe AB: length = 100 m, slope = 0.

01, n = 0. 013 Pipe BC: length = 135 m, slope = 0. 02, n = 0. 013 Pipe CD: length = 100 m, slope = 0. 07, n = 0. 013 Pipe DE: length = 165 m, slope = 0. 01, n = 0. 013 In your computations, take into consideration the various flow paths that lead to the determination of the time of the concentration. For instance, in determining the time of concentration for pipe BC, one flow path is from local inflow to inlet B and the other flow path is the local inflow time to inlet A plus the flow time through pipe AB. The entire drainage area only contributes to flow for the longest time of concentration.