A concrete sewer of 400 mm of diameter collects water from an urban catchment. During one of the storms, a depth of d 3200 mm was observed in the sewer.

The figure below shows the sewer horizontal length and elevation (in m) and the cross section of the pipe (in mm). a. Calculate area, wetted perimeter and hydraulic radius (12 marks) b. Determine its velocity (12 marks) c. Calculate flow rate of the channel (8 marks) d. Calculate its total energy at the end of the channel, considering the mean sea level as vertical datum, and assuming a Coriolis co efficient of 1.2 and draw its energy profile (18 marks)