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60 Chapter 2 Water Sources: Surface Water
For drainage area 2: are the field data collected by the researchers using English
6
2
A 2 648 10 m 160,119 acre 250 mi 2 units:
3
V s2 147,000 m 119.17 acre-ft For drainage area 1:
2
6
A 1 380 mi 984.2 10 m 2
Determine the coefficients of c and n for the southwestern re-
gion of the United States. V s1 165 acre-ft 203,528 m 3
2.8 The volume of silt deposited annually can be approxi- For drainage area 2:
6
mated by the following equation using English units: A 2 250 mi 647.5 10 m 2
2
V s c(A) n V s1 120 acre-ft 148,020 m 3
where Determine the coefficients of c and n for the southwestern re-
gion of the United States.
V s volume of silt deposited annually, acre-ft
A the size of the drainage area, mi 2 2.9 A spillway weir has an unobstructed crest length of 20 ft
(6.1 m) and a coefficient of discharge equal to 5.50. If the design
c a coefficient with a value varying from 0.43 through 1.7 to water head is 0.75 ft (0.23 m), what is the rate of discharge?
4.8 for low, average, and high deposition, respectively
2.10 A house for a family of four people has minimum
n a coefficient to be determined specifically for a target drinking and culinary requirements of 25 gpcd (95 Lpcd). The
drainage area. mean annual rainfall is 50 in./year (127 cm/year) and the effec-
A research team has investigated two drainage areas in the tive period between rainy periods is 150 days. Determine (a)
southwestern region of the United States, and has measured the size of the required rainfall collection cistern and (b) the
the volumes of their annually deposited silts. The following size of the required catchment area.

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