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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Presentation transcript:

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

Background 1. Development of Water Availability Model (WAM) by TNRCC 2. The model should determine: Whether sufficient water is availableWhether sufficient water is available Amount of water for each water rightAmount of water for each water right Percent of time it is availablePercent of time it is available ? ? ?

WRAP model Wrap1117 project developed in ArcView 3.2 to establish Wrap1117 project developed in ArcView 3.2 to establish watershed parameters for water rights. watershed parameters for water rights. 19 out of the 22 basins completed. 19 out of the 22 basins completed. TNRCC provides location of water rights, CRWR determines TNRCC provides location of water rights, CRWR determines Watershed parameters for those water rights and the contractor Watershed parameters for those water rights and the contractor uses the parameters to provide water availability data. uses the parameters to provide water availability data.

Parameters 1.Upstream areaof each control point 1.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

Exciting Cypress !!!

The Mess Control points Stream network

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

Grids Grids Grids!!! Flow Accumulation grid Fill grid Flow Direction grid Burn Grid DEM grid

More grids… Average CN Average precipitation

DEM stream network Original stream network DEM stream network

Snapped control points to DEM stream Original control points Snapped control points

Watershed Delineation Network created to determine connectivity between control points Watershed boundaries are delineated for each control point

Comparison of results with USGS data Results Percent difference should be less than 3 % HUC area for Gage is 893Mi 2

Acknowledgements Dr. Maidment Melissa Figurski Research group at CRWR

Q U E S T I O N S ????