CIV E 445 - APPLIED HYDROLOGY
SPRING 2014
HOMEWORK No. 1 SOLUTION

  1. Using Eq. 1-1:  ΔS = 900 - (550 + 50 + 250) = 50 mm.
    The change in volume of water remaining in storage in the 2500-km2 basin is:
    ΔS = 50 mm • 2500 km2 • (103 hm3/km3) • (10-6 km/mm) = 125 hm3.  ANSWER.

  2. Using Eq. 1-3:  Q = 15 - 13 = 2 in/yr.
    The mean annual runoff for the 60-mi2 watershed is:
    Q = [ (2 in/y) • (60 mi2) • (5280 ft/mi)2 ] / [ (12 in/ft) • (365 d/y) • (86,400 s/d)]
    Q = 8.84 cfs.  ANSWER.