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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 />Well yields are high, approximately 3,000 GPM; however, yields from the <br />Tansill and Yates Formations between lake McMillan and Carlsbad are relati- <br />vely small [21]. <br /> <br />From Carlsbad southward approximately half the distance to the state <br />line, alluvium along the Pecos River is the principal aquifer. Recharge is <br />by direct precipitation, by infiltration of flood flows issuing from arroyos <br />marginal to the valley, and by percolation of irrigation water. Discharge <br />not pumped by wells enters the River. Ground water also occurs in an allu- <br />vial aquifer south and west of Carl bad that is not hydraulically connected to <br />the alluvial aquifer along the Pecos River south of Carlsbad, but discharges <br />through springs and surface drainages to the Pecos. From a point midway be- <br />tween Carlsbad and the state line southward to Texas, the Pecos flows across <br />exposed evaporates. The availability of ground water in this area is limited <br />and its quality is poor. <br /> <br />The total estimated recoverable fresh to slightly saline ground water in <br />the entire Pecos River basin of New Mexico is estimated to be 370 million <br />acre-feet, of which only about 25 million acre-feet contain less than 1,000 <br />mg/l of TDS [15]. <br /> <br />Closed Basins - There are eight topographically closed basins within the <br />New Mexico portion of the Rio Grande Region. These are encompassed within <br />three broad areas referred to as the Central Closed Basins (WAU 130500), the <br />Western Closed Basins (western part of WAU 130202) and the Southwestern <br />Closed Basins (WAU 130302). <br /> <br />Sand and gravel valley fill interbedded with silt, clay and gypsiferous <br />playa lake deposits are the primary aquifers in the Central Closed Basins. <br />In general, the fill is thinnest at the margins of the bolsons and thickest <br />near the bolson centers. Recharge is from direct precipitation and from <br />infiltration of flood waters in mountain arroyos which drain into the <br />basins. The estimated total fresh to slightly saline water in the Central <br />Closed Basins is about 290,000,000 acre-feet [15]. <br />~ <br />-~ <br /> <br />31 <br />