Solution Sketch Exam 3 ¶
Bear, P. Olar
BRRRRRRRRR
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).
