Res 1994-166 - Laserfiche WebLink

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3i?I- 4,9, Aouifer ~vfana\;ement Guidelines, The parties agree to fInance water supplies from . the Supplemental Sources (hereinafter defIned) above county-specific Aquifer Management Guidelines (herein so called), defIned as the historic high usage compiled by the Texas Water Development Board and United States Geological Survey, as specifically set forth herein. The Aquifer Management Guidelines are: 160,000 acre-feet per annum for the Uvalde District; 120,000 acre-feet per annum for the Medina District; and a cumulative total of 370,000 acre-feet per annum for the Edwards District, with 325,000 acre-feet per annum for all of Bexar County, 30,000 acre-feet per annum for Comal County, and 15,000 acre-feet per annum for Hays County, Such Aquifer Management Guidelines do not constitute allocations and will be used solely for the purpose of implementing this Contract. The Medina District and Uvalde District retain discretion to determine fInancing for any water supplies above their respective Aquifer Management Guidelines, 5. WATER IYfANAGEi"fENT ELE:MENTS. The Parties recognize and set forth their agreed upon termS and conditions regarding the following key, elements of comprehensive water management planning: 5.1. Aquifer Complexity. The Aquifer is a unique and complex hydrological system. In general, the highly porous, faulted, and fresh-water bearing limestones of the Aquifer are across south-central Texas from partS of Kinney County to par:tS of Uvalde, Medina, Bexar, Comal, and Hays Counties. The 180-mile expanse of the fresh-water reservoir is defined by these hydrogeological boundaries: (1) the updip limit of the recharge are to the north and northwest; (2) the ground water divides in Kinney County to the west and in Hays County to the northeast; and (3) the downdip limit of freshwater, locally known as the fresh water and saline water interface, to the south; and bounded stratigraphically by the older Glen Rose Formation below, and the younger Del Rio Formation above. The arbitrary subsurface boundary between the fresh-water and saline-water zones in the downdip artesian portion of the l\quifer is defmed by a 1000mg/l dissolved solids concentration contour. This contour is sometimes referred to as the fresh/saline-water interface. In the fresh-water zone, void spaces (vugs) in the rocks are better connected, whereas in the saline zone the opposite is true. Thus the circulation of ground water in the fresh-water zone is much greater than in the saline-water zone. ~ The freshwater part of the Aquifer has three major hydrogeologic c~mponents: (1) A catchment area on the Edwards Plateau; (2) a recharge area, or unconfmed zone, that is part of the Balcones fault zone; and (3) an artesian area, or confined zone, underlying the Gulf Coastal Plain. The catchment area is separated from the recharge and artesian areas by an outcrop of the Glen Rose Formation, which has relatively little permeability and is considered a confining bed. The Balcones fault zone, which includes the recharge area, extends into most of the artesian - 5 -