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CE 3354 Engineering Hydrology
Fall 2022 Exam 3

LAST NAME, FIRST NAME

R00000000


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:

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
In [2]:
# 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:

In [1]:
# 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).