Water%20Quality%20Model%20for%20El%20Cajon%20Reservoir

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Water 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
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Project Location
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Issues

• 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

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Model Background

• What is HEC-HMS?
• Capable of long-term, distributed (gridded)
  simulations
• Methods Used within HEC-HMS
• SMA (Soil Moisture Accounting)
• MOD Clark

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Method 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

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HEC-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

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HEC-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

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HEC-HMS MOD Clark Results
6 hour
I day
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HEC-HMS MOD Clark Results
Actual Precipitation, Linear distribution
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HEC-HMS MOD Clark Results
Actual Precipitation, Modified Type II
distribution
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