Drought conditions during the study period of January 1, 2009, to September 30, 2013, caused a reduction in surfacewater releases from water-supply storage infrastructure of the Rio Grande Project, which led to changes in surfacewater and groundwater (conjunctive) use in downstream agricultural alluvial valleys. Surface water and groundwater Valley whereas there is an increasing sink of salt in the Mesilla Valley. Daily groundwater-level and water-quality data from shallow wells within the two alluvial valleys show spatial heterogeneity of water quality over the study period. Mass-balance salt-loading trends during the study period are similar to previous trends during the 1950s drought as well as a wet period in the 1980s. The similarity of salt-loading trends from the 1950s, 1980s, and 2000s independent of the climate indicates salt loading in this hydrologic setting may be driven by water-use practices rather than a single climatic variable. Rincon Valley Mesilla Valley Figure 2. Location of the Rincon and Mesilla Valleys within the Rio Grande Project area, New Mexico and Texas.
Graph showing average total annual and average total summer (June-September) precipitation at the Ruidoso, New Mexico, precipitation station (CL1) and maximum snow-water equivalent at the Sierra Blanca SNOpack TELemetry (SNOTEL) station (CL2), Sierra Blanca, N. Mex.
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