The following table lists the storm rainfall data and infiltration capacity data for a 24-hr storm beginning at midnight on April 14 of the current year.
a. Plot the rainfall hyetograph and the f capacity curve on rectangular coordinate paper.
b. Determine the total storm precipitation in inches.
c. By counting squares or by planimeter, determine the net storm rain by the f capacity method.
Rainfall Data for a Hypothetical Storm on April 15 of the Current Year (Beginning at midnight on April 14) | |||
Hour | Rainfall intensity (in./hr) | Infiltration capacity at beginning of hour (in./hr) | Hourly deduction for depression storage (in./hr) |
1 | 0.41 | 0.200 | 0.20 |
2 | 0.49 | 0.160 | 0.14 |
3 | 0.32 | 0.125 | 0.04 |
4 | 0.31 | 0.100 | 0.02 |
5 | 0.22 | 0.085 | 0.00 |
6 | 0.08 | 0.070 | 0.00 |
7 | 0.07 | 0.065 |
|
8 | 0.09 | 0.057 |
|
9 | 0.08 | 0.052 |
|
10 | 0.06 | 0.047 |
|
11 | 0.11 | 0.044 |
|
12 | 0.12 | 0.040 |
|
13 | 0.15 | 0.037 |
|
14 | 0.23 | 0.036 |
|
15 | 0.28 | 0.035 |
|
16 | 0.26 | 0.034 |
|
17 | 0.21 | 0.033 |
|
18 | 0.09 | 0.033 |
|
19 | 0.07 | 0.033 |
|
20 | 0.06 | 0.032 |
|
21 | 0.03 | 0.032 |
|
22 | 0.02 | 0.032 |
|
23 | 0.01 | 0.031 |
|
24 | 0.01 | 0.031 |
|
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