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<br />downstream from Santa. Rosa, near Roswell, and ,south of Carlsbad in- <br />creases the salinity of surface flows. -During periods of low stream- <br />flow the s-aline content of surface water exceeds the tolerance of <br />many irrigated crops. <br /> <br />Large sediment loads have silted stream channels and greatly <br />reduced the capacity of reservoirs. This problem will be partly <br />alleviated by sediment storage in authorized reservoirs, however, <br />land treatment and other conservation measures are required to <br />reduce sediment loads. <br /> <br />Phreatophyte growth invades stream channels and reservoir <br />areas. <br /> <br />Problem Area 5, ASA's 1302 and 1304. <br />is being mined, pumping from wells exceeds <br />levels are being lowered. <br /> <br />In areas where groundwater <br />recharge and groundwater <br /> <br />In the Roswell Artesian Basin in Chaves and Eddy Counties, <br />the natural and manmade discharge from the basin has exceeded the <br />recharge for many years, the artesian head, the shallow-water <br />table, and the base ,inflow into the river have been declining. <br />The continuing general decline of head in the artesian aquifer <br />has caused saline water which formerly discharged naturally to <br />the Pecos River to encroach into the fresh-water portion of the <br />aquifer east and north of Roswell. <br /> <br />Other areas shown on the Regional map, where groundwater is <br />being mined, are Sunshine Valley in Taos County; Estancia Basin <br />in Santa Fe and Torrance Counties; near Carrizozo in Lincoln <br />County; the Nutt-Hockett area in Dona Ana, Luna, and Sierra <br />Counties; and, the Mimbres Underground Water Basin in Luna County. <br />Most of the groundwater supplies in these areas are used for <br />irrigation. <br /> <br />Throughout the basin most of the groundwater supplies are <br />within boundaries of underground water basins as declared by <br />the State Engineer. In these areas, new appropriations cannot <br />be made if such appropriations will impair an existing right. <br /> <br />Groundwater supplies used for irrigation and other purposes <br />in the Rio Grande Region in New Mexico are furnished from multiple- <br />aquifer sources. Sources, static water levels, and yields vary <br />throughou~ the region. <br /> <br />The following tabulation shows acreage irrigated from ground- <br />water supplies in 1975 and the withdrawals and depletions from <br />this source. Part of the acreage received supplies from both <br />surface and groundwater, however, withdrawals and depletions <br />furnished from surface-water sources are not included as part of <br />this tabulation. <br /> <br />, , .., <br />u~~:..L",- <br /> <br />53 <br />