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CE 3354 Engineering Hydrology
Fall 2022 Exam 3
LAST NAME, FIRST NAME
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Purpose :¶
Demonstrate ability to apply hydrologic and problem solving principles to simulate watershed response using HEC-HMS.
Problem 1 - HEC-HMS Single Sub-Basin Simulation¶
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:
Solution
Copy of model is located at
http://54.243.252.9/ce-3354-webroot/4-Exams/EX3/src-sol/EX3HMS.zip
| Item | Value | Units |
|---|---|---|
| Peak Discharge Rate | 44.5 | Cubic Feet per Second |
| Time of Peak Discharge | 24 hrs | Elapsed Hours or Simulation Clock Time from HMS |
| Total Runoff | 4.90 | Watershed Inches |
| Total Precipitation Depth | 8.93 | Inches |
| Excess Precipitation Depth | 4.90 | Inches |
screen capture of your HEC-HMS solution here¶
Sketch the output hydrograph from HEC-HMS for your subbasin below
Problem 2 HEC-HMS Single Sub-Basin to a Reservoir¶
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¶
Set up the storage discharge table
Run simulation capture output from detention pond
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).
