Use the information provided in the situation to answer the questions.
1.
"A" (acreage) has already been determined. The next step in the Rational Method is to--
A.
Find the coefficient of runoff "C" on table 1.
B.
Determine the drainage basin TOC.
C.
Find CWTD.
D.
Classify the basin as simple or complex.
2.
Using the figure on page 2-21, determine the flow travel time for path 3. Cover type is average turf.
A.
31.3 minutes
B.
28.8 minutes
C.
26.4 minutes
D.
27.1 minutes
3.
If the total flow time of path 1 equals 31.3 minutes and the total for path 2 equals 27.1 minutes and there
are only two paths, then the TOC is--
A.
31.3 minutes
B.
27.1 minutes
C.
Basin TOC is not defined.
D.
26.4 minutes
4.
What is the "C" value for the basin given in the situation?
A.
32
B.
29
C.
40
D.
35
5.
What is the basin average slope?
A.
2.9 percent
B.
2.6 percent
C.
4.0 percent
D.
1.7 percent
6.
If you have pinpoint data for your drainage area for the worst storm in the past 50 years, which would you
use to calculate the intensity/duration relationship of the 5-year storm?
A.
The second worst storm.
B.
The tenth worst storm.
C.
The twenty-fifth worst storm.
D.
The average of the fifth and twenty fifth worst storm.
2-23
EN5465
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