Deal with a hypothetical watershed with the following parameters.Require actual HEC-HMS program computations.
Subbasin Number | Area (ac) | L (ft) | Lca (ft) | S (ft/mi) | Development (%) | Conveyance (%) |
1 | 1280 | 7000 | 4000 | 20 | 30 | 80 |
2 | 1485 | 9000 | 5050 | 20 | 28 | 80 |
3 | 2045 | 8750 | 4975 | 10 | 70 | 100 |
4 | 1517 | 8230 | 41 1 5 | 10 | 70 | 100 |
5 | 2752 | 10,000 | 6340 | 10 | 75 | 100 |
Assume S = S0 in each subbasin. The infiltration data are as follows:
Subbasin | Impervious (%) | SCS Curve Number |
1 | 20 | 78 |
2 | 18 | 80 |
3 | 52 | 85 |
4 | 55 | 85 |
5 | 60 | 90 |
Problem
Run the HEC-HMS model with Δt = 15 min to reflect the existing conditions, the effect of the pond with existing conditions, fully developed conditions, and the effect of the pond with fully developed conditions for both the 100-yr and the 10-yr design storms. Compare the peak flows at Junction 3 for the various run combinations.
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