Deal with a hypothetical watershed with the following parameters. involve input data setup only,
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
Create a new basin model for HEC-HMS Problem to reflect a detention pond near Junction 2. Assume that the pond can be modeled in such a way that only the runoff from subbasin 3 should be routed through it. The storage-discharge relation is given as follows:
S (ac-ft) | 0 | 200 | 375 | 508 | 860 | 1123 | 1 500 | 2120 |
Q (cfs) | 0 | 1 46 | 222 | 352 | 480 | 600 | 71 0 | 1733 |
Problem
Deal with a hypothetical watershed with the following parameters. involve input data setup only,
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
Create the basin model of the watershed in HEC-HMS using the data provided. Set up input data for the watershed using Clark’s UH method (TC&R). Use Muskingum routing methods and assume that K = 0.60 hr and x = 0.4 in reaches 1, 2, and 3. Assume two subreaches in each reach and assume baseflow is zero.
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