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Impact of Extended Pumping on Edwards Aquifer Water Levels: A 50-Year Projection

This report evaluates changes in water levels in the Edwards layer of the Edwards-Trinity aquifer over a 50-year period, considering current pumping rates under both normal and drought conditions. Utilizing Groundwater Availability Models (GAM), it assesses Managed Available Groundwater (MAG) and stipulates the necessity for Groundwater Conservation Districts (GCDs) to submit Desired Future Conditions (DFCs) to the Texas Water Development Board (TWDB). Understanding these dynamics is crucial for sustainable aquifer management in Groundwater Management Area 7.

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Impact of Extended Pumping on Edwards Aquifer Water Levels: A 50-Year Projection

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  1. Groundwater Management Area 7

  2. GAM 7-32 • Change in water levels in the Edwards layer if current pumping is extended over 50 years under normal rainfall conditions

  3. GAM 7-37 • Change in water levels over 50 years in the Edwards layer of the Edwards-Trinity aquifer projecting current pumping under drought of record conditions

  4. Minor Aquifers of GMA 7

  5. Section 36.108 of the Texas Water Code Requires GCDs in a GMA to submit DFC’s to the TWDB, which uses a GAM to determine MAGs!

  6. GROUNDWATER AVAILABILITY MODELS Computer models which simulate the operation of aquifers when various inputs are changed

  7. MANAGED AVAILABLE GROUNDWATER (MAG) • The amount of water: • available for permitted production in an aquifer • which will implement the attainment or maintenance of the Desired Future Condition

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