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Review Course Section Quiz 05
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1. Calculate the flow in a 6 ft wide x 3 ft deep, rectangular, concrete channel with a 0.5% slope.
a. 197.1 cu.ft./sec
b. 207.1 cu.ft./sec
c. 217.1 cu.ft./sec
d. 227.1 cu.ft./sec
2. An 8 ft wide by 4 ft deep rectangular channel has an obstruction that creates a 2 ft deep flow downstream. What is the velocity downstream of the obstruction?
a. 11.8 fps
b. 12.3 fps
c. 12.7 fps
d. 13.1 fps
3. Which of the following is not a typical function of a retention pond:
a. Temporary stormwater storage
b. Water aquifer recharging
c. Excess stormwater collection
d. Long-Term stormwater storage
4. Given an average rainfall intensity is 4.5 inches per hour, a 25-acre drainage area has a peak runoff rate of ______. The drainage area is 50% paved (C = 0.85) and 50% vegetation (C = 0.10)
a. 49.31 cu.ft./sec
b. 50.67 cu.ft./sec
c. 52.85 cu.ft./sec
d. 53.44 cu.ft./sec
5. Calculate Reynold’s number for a 4” inside diameter pipe with water flowing at 1.5 ft
^{3}
/sec. The absolute roughness coefficient = 8.7 x 10
^{-4}
ft. Kinematic viscosity of water = 1.217∗10
^{−}
^{5}
ft
^{2}
/s.
a. 3.8 x 10^5
b. 4.3 x 10^5
c. 4.7 x 10^5
d. 5.1 x 10^5
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