GMA 9

GAM RUN DOCUMENTS

(Please click on the link to transfer to the TWDB GAM Run Page to view.)

TEXAS WATER DEVELOPMENT BOARD - GMA 9 HOME
(Click on this link to access the GMA 9 website maintained by the Texas Water Development Board.)

The TWDB has conducted Groundwater Availability Model Runs (GAM Runs) for a variety of entities. The links below contain all the GAM Runs. If you are interested in the various GAM Runs conducted for GMA 9, you can scroll down the list, look for GMA 9 in the third column, and then click on the GAM Run link in the sixth column to access the GAM Run you are interested in.

July 2008	GAM Run (A) : 35 Feet	The Texas Water Development Board has released this draft version of the first of three requested runs of the Hill Country Trinity Aquifer Groundwater Availability Model. This first run looks at a possible Desired Future Condition of allowing no more than a 35 foot drop in average aquifer level from 2008 average levels by the year 2060. We are still waiting on the variable drawdown run.
July 2008	GAM Run (B) : 15 Feet	The Texas Water Development Board has released this draft version of the second of three requested runs of the Hill Country Trinity Aquifer Groundwater Availability Model. This second run looks at a possible Desired Future Condition of allowing no more than a 15 foot drop in average aquifer level from 2008 average levels by the year 2060. We are still waiting on the variable drawdown run.
August 2008	GAM Run (C) : Various DFCs	The Texas Water Development Board has released this draft version of the third of three requested runs of the Hill Country Trinity Aquifer Groundwater Availability Model. This third run looks at mixed Desired Future Conditions based on average aquifer levels from 2008 average levels by the year 2060, and also divides the Trinity Aquifer into three separate sub-aquifers.
December 2008	GAM Run 08-70 Draft	This GAM run is a 60-year predictive run. Two runs use 2008 baseline pumpage for the Edwards Group, the Upper Trinity aquifer, and the Middle Trinity aquifer and average recharge rates. • Part A uses 25 percent additional pumpage for the Middle Trinity aquifer. • Part B uses 50 percent additional pumpage for the Middle Trinity aquifer. • Part C (a third run) consists of a steady-state model run using no pumpage and average recharge rates to estimate water levels that existed under pre-development conditions.
February 2011	GAM Run 10-049 MAG Draft	This GAM run is the estimated total pumping from the Edwards-Trinity (Plateau) Aquifer that achieves the desired future condition adopted by the members of Groundwater Management Area 9 is approximately 2,264 acre-feet per year between 2010 and 2060.
February 2011	GAM Run 10-050 MAG version 2 Draft	This GAM run is the estimated total pumping from the Trinity Aquifer that achieves the desired future condition adopted by the members of the Groundwater Management Area 9 declines from approximately 93,000 acre-feet per year to approximately 90,500 acre-feet per year between 2010 and 2060.

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