Tabulated below are total rainfall intensities during each hour of a frontal storm over a drainage basin.
a. Plot the rainfall hyetograph (intensity versus time).
b. Determine the total storm precipitation amount in inches.
c. If the net storm rain is 2.00 in., determine the exact ϕ index (in./hr) for the drainage basin. (Note that by definition the area under the hyetograph above the ϕ index line must be 2.00 in.)
d. Determine the area of the drainage basin (acres) if the net rain is 2.00 in. and the measured volume of direct surface runoff is 2,015 cfs-hr.
e. Using the ϕ index calculated in part c, determine the volume of direct surface runoff (acre-ft) that would result from the following:
Hour | 1 | 2 | 3 | 4 |
Intensity (in./hr) | 0.40 | 0.05 | 0.30 | 0.20 |
Hour | Rainfall intensity (in./hr) |
1 | 0.41 |
2 | 0.49 |
3 | 0.22 |
4 | 0.31 |
5 | 0.22 |
6 | 0.08 |
7 | 0.07 |
8 | 0.09 |
9 | 0.08 |
10 | 0.06 |
11 | 0.11 |
12 | 0.12 |
13 | 0.15 |
14 | 0.23 |
15 | 0.28 |
16 | 0.26 |
17 | 0.21 |
18 | 0.09 |
19 | 0.07 |
20 | 0.06 |
21 | 0.03 |
22 | 0.02 |
23 | 0.01 |
24 | 0.01 |
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