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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />r.~ <br />~ <br />~ <br /> <br />Yields from individual wells are normally several hundred gallons per <br />minute; yields of up to 2,400 GPM have been measured. Large volumes of <br />saline water also occur in the basins (in excess of 60,000,000 acre-feet in <br />the Tulerosa Basin [15]). In general, ground water in the basins is being <br />mined with the water table in localized areas having dropped as much as 50 <br />feet. <br /> <br />There is little information available on the ground water resources of <br />the Western Closed Basins. Locally fractured basalt is the predominant <br />dqulrer. The amount of ground water available is unknown. Present use is <br />limited primarily to rural domestic and stock watering purposes; use for <br />irrigation is minimal. There has been some indication that, although <br />topographically separate, the Western Closed Basins are hYdraulically con- <br />nected to the Rio Grande mainstem, and some estimates of ground water availa- <br />bility [15,19] for the Rio Grande valley include the Western Closed Basins. <br /> <br />Ground water in the upper 1,000 feet of the Southwestern Closed Basins <br />generally contains less than 1,000 mg/l of TDS. There is no published infor- <br />mation on the amount of water in storage nor on water resources deeper than <br />1,000 feet. <br /> <br />Texas <br /> <br />Ground water in the Rio Grande Region of Texas occurs in a variety of <br />materials including unconsolidated sand and gravel, poorly to well con- <br />solidated sand and silt, limestone, gypsum, and igneous and metamorphic <br />rocks. <br /> <br />Along the Rio Grande mainstem from New Mexico to near the City of El <br />Paso on the west side of the Franklin Mountains at the extreme southern end <br />of WAU 130301, the principal aquifer comprises Masilla Bolson fill and Rio <br />Grande alluvium. East of the Franklin Mountains and stretching along the Rio <br />Grande from El Paso to near Fort Quitman in WAU 130401, the principal aquifer <br />is composed of the Hueco Bolson fill and Rio Grande alluvium. The thickness <br />of the aquifer in the Masilla Bolson is 2,000 feet; in the Hueco Bolson, it <br />is 9,000 feet. Fresh ground water occurs to depths of 1,200 feet. Yields of <br /> <br />32 <br />