U.S. Geological Survey, Water Resources Division, 4501 Indian School Road N.E., Suite 200, Albuquerque, New Mexico 97110.
RIO GRANDE VALLEY, COLORADO, NEW MEXICO, AND TEXAS1
Version of Record online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 29, Issue 4, pages 617–646, August 1993
How to Cite
Ellis, S. R., Levings, G. W., Carter, L. F., Richey, S. F. and Radell, M. J. (1993), RIO GRANDE VALLEY, COLORADO, NEW MEXICO, AND TEXAS. JAWRA Journal of the American Water Resources Association, 29: 617–646. doi: 10.1111/j.1752-1688.1993.tb03230.x
Paper No. 93132 of the Water Resources Bulletin. Discussions are open until April 1, 1994.
- Issue online: 8 JUN 2007
- Version of Record online: 8 JUN 2007
- Rio Grande Valley;
- regional hydrogeology;
- surface-water flow;
- ground-water flow;
- water quality;
- water use
ABSTRACT: The Rio Grande Valley National Water-Quality Assessment study unit encompasses about 45,700 square miles in Colorado, New Mexico, and Texas upstream from the gaging station Rio Grande at El Paso, Texas, and includes surface-water closed basins east of the Continental Divide in New Mexico, and the San Luis Closed Basin in Colorado. The mean annual precipitation ranges from less than 6 to more than 50 inches; potential evapo-transpiration ranges from less than 35 to more than 80 inches per year. Land use is mainly rangeland, forest land, and cropland. Total irrigated acreage in 1990 was about 914,000 acres and water use was about 3,410,000 acre-feet. Two structural settings are found in the study unit: alluvial basins and bedrock basins. The alluvial basins can have through-flowing surface water or be closed basins. The discussion of streamflow and water quality for the surface-water system is based on four river reaches for the 750 miles of the main stem. The quality of the ground water is affected by both natural process and human activities and by nonpoint and point sources. Nonpoint sources for surface water include agriculture, hydromodification, and mining operations; point sources are mainly discharge from wastewater treatment plants. Nonpoint sources for ground water include agriculture and septic tanks and cesspools; point sources include leaking underground storage tanks, unlined or manure-lined holding ponds used for disposal of dairy wastes, landfills, and mining operations.