Given below is a 3-hr unit hydrograph for a watershed. The ϕ index is 1.5 in./hr. Create the DRII for an 18-In storm having six successive 3-hr in rainfall rates of 2.5, 3.5, 1.5, 4.0, 6.5, and 2.5 in./hr.
Time (hr) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
Q (UH) | 0 | 10 | 40 | 60 | 80 | 100 | 90 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 |
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