a)
Time | Area | Incremental area | Cumulative rainfall | Rainfall | Losses = depression storage | Effective rainfall | Hyetograph ordinates | Runoff generated by effective rainfall of 0.65 in | Runoff generated by effective rainfall of 0.45 in | Total hydrograph ordinates |
0 | 0 | 0 | 0 | 0 | ||||||
0.5 | 250 | 0.4 | 0 | 0 | 0 | |||||
1 | 250 | 250 | 0.8 | 0.4 | 0.55 | 0 | 0 | 0 | 0 | |
1.5 | 198.92 | 2 | 1.2 | 0.55 | 0.65 | 1.3 | ||||
2 | 198.92 | 448.92 | 3.2 | 1.2 | 0.55 | 0.65 | 1.3 | 327.7083 | 0 | 327.7083 |
2.5 | 180 | 4.2 | 1 | 0.55 | 0.45 | 0.9 | ||||
3 | 180 | 628.92 | 5.2 | 1 | 0.55 | 0.45 | 0.9 | 260.7509 | 226.875 | 487.6259 |
3.5 | 70 | |||||||||
4 | 70 | 698.92 | 235.95 | 180.5199 | 416.4699 | |||||
4.5 | ||||||||||
5 | 91.7583 | 163.35 | 255.1083 | |||||||
5.5 | ||||||||||
6 | 63.525 | 63.525 | ||||||||
6.5 | ||||||||||
7 | 0 | 0 |
c) Peak flow = 487.6259 cfs
Lag time= Difference in peak of DRH and hyetograph = 3 - 1.5 = 1.5 hour
Peak of Hyetograph = 1.5 hr
Peak of DRH = 3 hr
Time of rise = 3hour
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2. A watershed is approximately 43 sq.miles. Time for each area to outlet is given in Table 1. In this watershed, a storm happened as given in hyetograph. Find the resulting hydrograph. Time to outlet Area sq.miles Time to1 outlet (hr) Rainfall hyetograph Time A3-9 A4-13 2 0-2 hrs 2-3 hrs 1 Rainfall (in/hr) 1 A1 A2 A4 A3 2. A watershed is approximately 43 sq.miles. Time for each area to outlet is given in Table 1. In this watershed,...
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