Mr. Dennis Clark, Emerald Underground Water Conservation District DESCRIPTION OF REQUEST:

Mr. Clark requested the following information from the Edwards-Trinity aquifer Groundwater Availability Model (GAM) for the Emerald Underground Water Conservation District (UWCD): • Average annual recharge and • Total available storage as specific yield. METHODS: To address the request, we: • Provided a published estimate of 0.3 inches per year from Iglehart, 1967. This estimate was provided because the model was not yet calibrated in time to meet Mr. Clark’s deadline. • Estimated specific yield of 82.5 million acre-feet for the aquifer(s) from pre-development water level and structural information being used in the GAM study. PARAMETERS AND ASSUMPTIONS