Water%20Quality%20Model%20for%20El%20Cajon%20Reservoir - PowerPoint PPT Presentation

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

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Water Quality Model for El Cajon Reservoir. Oliver Obregon and Clark Barlow ... Dams are planned and under construction along the Santiago River in the Cajon watershed ... – PowerPoint PPT presentation

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


1
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
2
Project Location
3
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

4
Model Background
  • What is HEC-HMS?
  • Capable of long-term, distributed (gridded)
    simulations
  • Methods Used within HEC-HMS
  • SMA (Soil Moisture Accounting)
  • MOD Clark

5
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

6
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

7
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

8
HEC-HMS MOD Clark Results
6 hour
I day
9
HEC-HMS MOD Clark Results
Actual Precipitation, Linear distribution
10
HEC-HMS MOD Clark Results
Actual Precipitation, Modified Type II
distribution
11
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