Profile Picture EGS Data Services

created Oct 31 2017

updated Oct 22 2018

Description

This layer represents the boundaires of watersheds which have a contributing impact on the Edwards Aquifer.The Edwards Aquifer contributing zones polygon file was created from modeled boundaries (2003 LIDAR) and customized boundaries based on contours, drainage infrastructure, COA Plans, and staff knowledge. The Edwards Aquifer is an underground layer of porous, honeycombed, water-bearing rock that is between 300-700 feet thick.The contributing zone occurs on the Edwards Plateau, also called the Texas Hill Country.The contributing zone is also called the drainage area or the catchment area. Here the land surface "catches" water from rainfall that averages about 30" per year, and water runs off into streams or infiltrates into the water table aquifer of the plateau. Runoff from the land surface and water table springs then both feed streams that flow over relatively impermeable limestones until they reach the recharge zone.
The area of Eastern contributing zone located in the Colorado River watershed, and along Robert E Lee Dr. was added in Aug 2014 when City staff discovered it was not included in the original 2005 delineation.

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