Given the following data, route a storm hydrograph through a full reservoir and plot on the same graph the inflow and resulting outflow hydrograph for the Green Acre watershed. The bottom of the rectangular spillway is placed at an elevation of 980.0 ft. The following data are given: area = 0.64 mi2; length = 1.10 mi; Lca = 0.53 mi; Ct = 2.00: Cp = 0.62; outflow = CYH3/2; C = 3.5; L = 10 ft; and the following storage–elevation curve table.
(a) Find the 15-min unit hydrograph by Snyder’s method.
(b) Find the 30-min unit hydrograph.
(c) Find the hydrograph that results from 1.8 in. of rain for the first 30 min and 0.63 in. for the next 15 min.
(d) Develop a (2S/Δt) + O versus O curve using a routing period of 15 min and the outflow and storage curves provided.
(c) Route the storm hydrograph through the reservoir assuming it is full to the bottom of the spillway elevation 980 ft.
(f) Indicate the maximum height of the water in the reservoir.
(g) At what elevation should the top of the dam be placed to obtain 5 ft of free-board?
Elevation (ft) | Incremental storage (10−4 ft3)r. | Total storage (10−4 ft3) |
960 |
| 0 |
970 | 40 | 40 |
980 | 210 | 250 |
990 | 590 | 840 |
| 1240 |
|
1000 |
| 2080 |
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