20. An outlet consisting of a 0.6 m circular pipe is proposed for the detention basin shown in Figure below. The invert of the pipe is 99.0 m, and the top of berm is set at elevation 107.0 m. Compute the discharge rating for the outlet. Plot/Sketch the stage versus discharge curve. (4). Assume all parameters are required. Maximum impoundment level for design storm Top of berm Invert of outlet pipe (lowest point of impoundment) Outlet pipe