Question

A detention basin with vertical walls has a surface area of 4047 m2 . Outflow from the basin is characterized by the storage-outflow relationship provided below, wherein outflow is in m3 /s, storage is in m3 , and Δt = 10 minutes. Suppose inflow into the basin is characterized by a triangular hydrograph that increases linearly from the origin to a peak of 10.2 m3 /s at 60 min, and then decreases linearly back to zero at 150 min. Assuming the basin is initially empty, determine the peak outflow (m3 /s) that will be observed using a 10-min time step. Also report the water depth (ft) in the basin when peak outflow occurs.

Q= 0.1585*(2S/Δt+Q）

Answer 1