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
Set up a diversion at Junction 2 of the existing condition basin so that Reach 1 and subbasin 3 flow into it. Use the inflow-diversion relationship from Table , and compare the peak outflows at Junction 3 of the new basin model for the 10-yr and 100-yr storm events.
Table
(a) Inflow-Diversion Relation for the Added Diversion
Inflow (cfs) | Diversion (cfs) |
0 | 0 |
500 | 375 |
1000 | 750 |
2500 | 1545 |
5000 | 3150 |
10,000 | 5000 |
(b) Comparison of Peak Flows with and without a Diversion in the Hypothetical Watershed for the 100-yr Storm
| Peak Outflow (cfs) | |
Conditions | Junction-B | Junction-C |
Without diversion | 4197 | 9024 |
With diversion | 1562 | 7429 |
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