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Demonstrate ability to apply hydrologic and problem solving principles to simulate watershed response using HEC-HMS.
Build a HEC HMS rainfall-runoff model for a single sub-basin watershed with the properties below.
Item | Value | Units |
---|---|---|
Drainage Area | 0.218 | Square Miles |
Composite CN | 67 | Dimensionless |
Basin Lag | 17.4 | Minutes |
Rainfall Rate (Hour 0 – Hour 24) | 0.375 | Inches per hour |
Rainfall Rate (Hour 25 – Hour 48) | 0.0 | Inches per hour |
Figure 1 below is a HEC-HMS model configuration that should give you an idea of what to build in HEC-HMS.
The HEC-HMS model should simulate a 48 hour period of interest. Use the output of your model to complete the table below:
Item | Value | Units |
---|---|---|
Peak Discharge Rate | ??? | Cubic Feet per Second |
Time of Peak Discharge | ??? | Elapsed Hours or Simulation Clock Time from HMS |
Total Runoff | ??? | Watershed Inches |
Total Precipitation Depth | ??? | Inches |
Excess Precipitation Depth | ??? | Inches |
# screen capture of your HEC-HMS solution here
Sketch the output hydrograph from HEC-HMS for your subbasin below
Add a detention basin (reservoir) at the outlet of the small watershed that has the properties listed below.
Storage (Acre-Feet) | Discharge (cfs) |
---|---|
0.0 | 0.00 |
0.5 | 1.50 |
1.0 | 2.25 |
1.5 | 2.75 |
2.0 | 3.26 |
2.5 | 7.00 |
3.0 | 18.00 |
3.5 | 30.00 |
4.0 | 90.00 |
The HEC-HMS configuration should look similar to Figure 3 below:
# screen capture of your HEC-HMS solution here
Sketch the output hydrograph from HEC-HMS from the detention pond (outflow from the pond after the sub-basin hydrograph is routed through the detention pond).