Abstract
The Southwest Alluvial Basins Regional Aquifer-System Analysis in parts of Colorado, New Mexico, and Texas consists of 22 alluvial basins along and adjacent to the Rio Grande. Geochemistry, recharge, and ground-water quality in the San Luis Basin in Colorado, and the Albuquerque-Belen, Socorro, and Mesilla basins in New Mexico are described. Ground-water flow systems were simulated in the San Luis, Albuquerque-Belen, and Mesilla basins.