Title: Water%20Quality%20Model%20for%20El%20Cajon%20Reservoir
1Water Quality Model for El Cajon Reservoir
HEC-HMS Long-term Simulation of Cuenca Cajon
Oliver Obregon, Thomas Lloyd, Clark
Barlow Brigham Young University
- Oliver Obregon and Clark Barlow
Brigham Young University, In collaboration
with ITESO University
2Project Location
3Issues
- Dams are planned and under construction along
the Santiago River in the Cajon watershed - Mexican engineers would like to be able to
predict how quickly new dams will be filled with
water
4Model Background
- What is HEC-HMS?
- Capable of long-term, distributed (gridded)
simulations - Methods Used within HEC-HMS
- SMA (Soil Moisture Accounting)
- MOD Clark
5Method Information
SMA
MOD Clark
- True long-term simulation
- Uses parameters such as canopy storage,
groundwater storage, infiltration rates,
evapotransporation rates, etc.
- Requires fewer parameters
- Better suited for single storm events (short-term
simulations) - SCS based method
6HEC-HMS SMA Method
- Information Gathered
- DEMs, Dam locations, Soil and Land Use Data (not
used) - Information Not Gathered
- Everything else
- SMA Project Approach
- Using real and fabricated data, built a running,
working model - Created a HEC-HMS SMA tutorial
- Created a parameter optimization tutorial
7HEC-HMS MOD Clark Method
- Information Gathered
- DEMs, Dam locations, Soil and Land Use,
Precipitation (Tepic) - Assumptions
- 25 x 25 grid
- Precipitation data was representative
- Two month duration (wettest months)
- MOD Clark Project Approach
- Created CN table for land use and soil data
- Used average daily precipitation values (6-hour
and daily increments) - Used actual daily precipitation data from
July-August 2006
8HEC-HMS MOD Clark Results
6 hour
I day
9HEC-HMS MOD Clark Results
Actual Precipitation, Linear distribution
10HEC-HMS MOD Clark Results
Actual Precipitation, Modified Type II
distribution
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