Tabulated below are total hourly discharge rates at a cross section of a stream. The drainage area above the section is 1.0 acre. (a) Plot the hydrograph on rectangular coordinate paper and label the rising limb (concentration curve), the crest segment, and the recession limb. (b) Determine the hour of cessation of the direct runoff using a semilog plot of Q versus time. (c) Use the base flow portion of your semilog plot to determine the groundwater recession constant K. (d) Carefully construct and label base flow separation curves on the graph of part (a), using two different methods.
Time (hr) | Q (cfs) |
0 | 102 |
1 | 100 |
2 | 98 |
3 | 220 |
4 | 512 |
5 | 630 |
6 | 460 |
7 | 330 |
8 | 210 |
9 | 150 |
10 | 105 |
11 | 75 |
12 | 60 |
13 | 54 |
14 | 48.5 |
15 | 43.5 |
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