Determining Watershed Parameters for Water Rights in theCypress River Basin

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Determining Watershed Parameters for Water Rights
in the Cypress River Basin
By Hema Gopalan GIS in Water Resources (C E
394K) Fall 2001
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Background

• Development of Water Availability Model (WAM)
  by TNRCC

2. The model should determine
?
?

• Whether sufficient water is available
• Amount of water for each water right
• Percent of time it is available

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WRAP model

• TNRCC provides location of water rights, CRWR
  determines
• Watershed parameters for those water rights
  and the contractor
• uses the parameters to provide water
  availability data.

• Wrap1117 project developed in ArcView 3.2 to
  establish
• watershed parameters for water rights.

• 19 out of the 22 basins completed.

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Parameters

• Upstream area of each control point

2. Average upstream precipitation
3. Average upstream Curve Number
4. Connectivity of water rights
5. Flow length to outlet
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Exciting Cypress !!!
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The Mess
Control points
Stream network
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Buffer zone and surrounding streams

• The basin outline is buffered
• by a 10 Km zone

• This is to ensure all appropriate
• areas are captured

• All streams must drain
• off the DEM for proper
• grid processing

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Grids Grids Grids!!!
DEM grid
Burn Grid
Flow Accumulation grid
Flow Direction grid
Fill grid
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More grids
Average precipitation
Average CN
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DEM stream network
64
32
128
Original stream network
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16
8
2
4
DEM stream network
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Snapped control points to DEM stream
Snapped control points
Original control points
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Watershed Delineation
Network created to determine connectivity between
control points
Watershed boundaries are delineated for each
control point
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Results
Comparison of results with USGS data
Percent difference should be less than 3
HUC area for Gage 7346000 is 893Mi2
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Acknowledgements
Dr. Maidment
Melissa Figurski
Research group at CRWR
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Q U E S T I O N S ????