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Question 1 of 10
1. Question
A drainage basin creates a 25.0 acreft amount of stormwater runoff that must be drained into a rectangular channel that is 4 ft. wide and 2 ft. deep and has a 0.2 percent uniform slope. Assume a coefficient of Manning roughness of 0.022 and a steady flow depth of 1.5 ft. The nearest time (hours) it will take to discharge the runoff is:
Correct
Q = VA = {1.49/n R2/3S1/2} A
{1.49/0.022 (1.5 ft. x 4 ft./ 4 ft. + 2 x 1.5 ft.) 2/3 x (0.002)1/2} (1.5 ft. x 4ft) = 16.4 cfs
volume = 25 acreft. x 43,560 ft3/ 1 acreft. = 1.089 x 10 ft3
Time = 1.089 x 10 ft3/16.4 ft3/sec x 1 min/ 60 sec x 1 hr/ 60 mins = 18.5 hoursIncorrect
Q = VA = {1.49/n R2/3S1/2} A
{1.49/0.022 (1.5 ft. x 4 ft./ 4 ft. + 2 x 1.5 ft.) 2/3 x (0.002)1/2} (1.5 ft. x 4ft) = 16.4 cfs
volume = 25 acreft. x 43,560 ft3/ 1 acreft. = 1.089 x 10 ft3
Time = 1.089 x 10 ft3/16.4 ft3/sec x 1 min/ 60 sec x 1 hr/ 60 mins = 18.5 hours 
Question 2 of 10
2. Question
Two 12in identical. Storm sewers flow fully into a junction box at a 2 percent slope. A single, wider pipe flows out of the box with the same material and slope. Assuming the sizes of the flow pipes are commercially available, the minimum size of this downstream pipe (in.) built for maximum flow is almost:
Correct
The minimum size of the downstream pipe is 16 inches.
Incorrect
The minimum size of the downstream pipe is 16 inches.

Question 3 of 10
3. Question
What is the average mean of the following precipitation? 2.1, 3.6, 1.3, 1.5, 2.6, 6.1, 5.1, 4.8, 4.1, 2.8, and 3.0.
Correct
(2.1+3.6+1.3+1.5+2.6+6.1+5.1+4.8+4.1+2.8+3.0)/11 = 3.4 in.
Incorrect
(2.1+3.6+1.3+1.5+2.6+6.1+5.1+4.8+4.1+2.8+3.0)/11 = 3.4 in.

Question 4 of 10
4. Question
A drainage ditch of stormwater with a maximum capacity of 10 CFS discharges to a detention basin. The capacity of the detention basin is 400.000 al. The total discharge to the retention basin during a storm event was 1.5 CFS. The most probable time (hours) to fill the empty basin will be:
Correct
Time = V/Q
V = 400,000 gal x ft3/7.48 gal = 53,476 ft3
Q = 1.5 ft3/sec
Time = 53,476 ft3/1.5 ft3/sec x 1 hr/3,600 sec = 9.9 hoursIncorrect
Time = V/Q
V = 400,000 gal x ft3/7.48 gal = 53,476 ft3
Q = 1.5 ft3/sec
Time = 53,476 ft3/1.5 ft3/sec x 1 hr/3,600 sec = 9.9 hours 
Question 5 of 10
5. Question
In a 1,650ft section of 3ftdiameter tubing, assume maximum turbulent flow. 0.0115 is the DarcyWeisbach friction factor f. The energy grade line above the section has a 5ft drop. Most possibly, the flow rate (CFS) is:
Correct
The DarcyWeisbach equation is hf = f L/D x V²/2g
Where, hf = headloss, ft
f = friction factor, unitless
L = length, ft
D = diameter of pipe, ft
V = velcoty, ft/sec
g = gravitational constant, 32.2 ft/sec5ft = 0.0115 x 1,650ft/3.0 ft x V²/2 x 32.2 ft/sec²
V² = 50.91 ft²/sec²
V = 7.135 ft/sec
Q = VA = V x ╤/4 D² = 7.135 ft/sec x ╤/4 (3.0 ft)²
Q = 50 cfsIncorrect
The DarcyWeisbach equation is hf = f L/D x V²/2g
Where, hf = headloss, ft
f = friction factor, unitless
L = length, ft
D = diameter of pipe, ft
V = velcoty, ft/sec
g = gravitational constant, 32.2 ft/sec5ft = 0.0115 x 1,650ft/3.0 ft x V²/2 x 32.2 ft/sec²
V² = 50.91 ft²/sec²
V = 7.135 ft/sec
Q = VA = V x ╤/4 D² = 7.135 ft/sec x ╤/4 (3.0 ft)²
Q = 50 cfs 
Question 6 of 10
6. Question
For proper soil classification using the Unified Soil Classification or the AASHTO Soil Classification system, the most important requirements are:
Correct
For proper soil classification using the Unified Soil Classification or the AASHTO Soil Classification system, the most important requirements are grainsize distribution and Atterberg limits.
Incorrect
For proper soil classification using the Unified Soil Classification or the AASHTO Soil Classification system, the most important requirements are grainsize distribution and Atterberg limits.

Question 7 of 10
7. Question
The basic penetration test is commonly used to obtain which of the following as an easy and economic means of?
Correct
The Nvalue norm penetration test gives an indicator of the relative cohesionless density of soils.
Incorrect
The Nvalue norm penetration test gives an indicator of the relative cohesionless density of soils.

Question 8 of 10
8. Question
A 12=ft x 20ft concrete slab has to be moved at night time in a temperature of 50°F. The minimum compressive strength is 3,500 psi. What should the concrete mix most likely be made of?
Correct
Early strength concrete is needed with a minimum strength of 3,500 psi with type 3 cement and chemical accelerators.
Incorrect
Early strength concrete is needed with a minimum strength of 3,500 psi with type 3 cement and chemical accelerators.

Question 9 of 10
9. Question
What causes steel fatigue?
Correct
Steel fatigue can be caused by a reduction in strength due to cyclical loads.
Incorrect
Steel fatigue can be caused by a reduction in strength due to cyclical loads.

Question 10 of 10
10. Question
Which statement is incorrect?
Correct
Rushing erosion is not a stormwater erosion classification.
Incorrect
Rushing erosion is not a stormwater erosion classification.