5- A rainfall of 3 in/h falls on a uniform, smooth, impervious plane that is 50 feet long and has a slope of 1 percent. Calculate discharge per unit width, depth, and velocity at the bottom and of the plane. Take v = 1.2 x 10-5ft/s and n = 0.015 (15/100). 6- Solve problem 5, if rain falls on grass with an infiltration rate of 0.5 in /hr and a Darcy-Weisbach roughness f=100 (10/100).