CIV E 445 - APPLIED HYDROLOGY
SPRING 2009
SOLUTION TO HOMEWORK 1, CHAPTER 1

Problem 1-1

The mean annual flow is: Q = [ 19.7 m3/s • 86,400 s/d • 365 d/y • 1000 mm/m ] / [ 6937 km2 • (1000 m/km)2 ] = 89.6 mm/y

The precipitation depth abstracted by the catchment is: (485 - 89.6) = 395.4 mm/y.   ANSWER.

Problem 1-2

The mean annual flow is: Q = [ 550 ft3/s • 86,400 s/d • 365 d/y] / [ 756 mi2 • (5280 ft/mi)2 ] = 0.82 ft/y = 9.87 in/y

The precipitation depth abstracted by the catchment is: (25 - 9.87) = 15.13 in/y.   ANSWER.