Route the given inflow hydrograph through the reservoir by assuming the initial water level is at the emergency spillway level (1.160 ft) and that the principal spillway is plugged with debris. The reservoir has a 500-ft-wide ideal emergency spillway (C = 3.0) located at the 1,160-ft elevation. Storage–area–elevation data are:
Elevation (ft) | Area of pool (ft2 × 106) | Storage (ft3 × 106) |
1110 | 0 | 0 |
1120 | 0.85 | 4.25 |
1140 | 3.75 | 50.25 |
1158 | 9.8 | 172.15 |
1160 | 10.8 | 192.75 |
1162 | 11.8 | 215.35 |
1164 | 12.8 | 239.95 |
1166 | 13.8 | 266.55 |
1168 | 14.85 | 295.20 |
1180 | 25.0 | 528.55 |
The inflow hydrograph data are:
Time (hr) | I (cfs) |
0.0 | 0 |
0.5 | 3,630 |
1.0 | 10,920 |
1.5 | 10,720 |
2.0 | 5,030 |
2.5 | 1,600 |
3.0 | 460 |
3.5 | 100 |
4.0 | 10 |
4.5 | 0 |
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