CIV E 445 - APPLIED HYDROLOGY
SPRING 2003
SOLUTIONS TO HOMEWORK 1 , CHAPTER 1

Problem 1-1

Using Eq. 1-1: Δ S = 900 - (450 + 100 + 250) = 100 mm.
The change in volume of water remaining in storage is:

Δ S = 100 mm • 2500 km2 • 103 hm3/km3 • 10-6 km/mm = 250 hm3.  ANSWER.

Problem 1-2

Using Eq. 1-3: Q = 15 - 13 = 2 in. The mean annual runoff is:

Q = [ (2 in/y) • (60-mi2) • (5280 ft/mi)2 ] / [ (12 in/ft) • (365 d/y) • (86,400 s/d) ] = 8.84 ft3/s.  ANSWER.