1. A rainfall with intensity of 40 mm/h and duration of 1.5 h falls on a 520 hacatchment. Use rational method to calculate the peak runoff for the followingconditions: a)

Natural soil, with time of concentration te = 2 hour and C = 0.4, b) Improved, partially paved area, with time of concentration te =1 hour and C = 0.7.State any assumptions used.