Method to identify wells that yield water that will be replaced by water from the Colorado River downstream from Laguna Dam in Arizona and California

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Title Method to identify wells that yield water that will be replaced by water from the Colorado River downstream from Laguna Dam in Arizona and California
Creator Owen-Joyce, Sandra J.; Wilson, Richard P.; Carpenter, Michael C.; Fink, James B.
Subject Water rights; Wells; Aquifers
Spatial Coverage Colorado River (Colo.-Mexico); Colorado; Arizona; California
Description Accounting for the use of Colorado River water is required by the U.S. Supreme Court decree, 1964, Arizona v. California. Water pumped from wells on the flood plain and from certain wells on alluvial slopes outside the flood plain is presumed to be river water and is accounted for as Colorado River water. The accounting-surface method developed for the area upstream from Laguna Dam was modified for use downstream from Laguna Dam to identify wells outside the flood plain of the lower Colorado River that yield water that will be replaced by water from the river. Use of the same method provides a uniform criterion of identification for all users pumping water from wells by determining if the static water-level elevation in the well is above or below the elevation of the accounting surface. Wells that have a static water-level elevation equal to or below the accounting surface are presumed to yield water that will be replaced by water from the Colorado River. Wells that have a static water-level elevation above the accounting surface are presumed to yield river water stored above river level. The method is based on the concept of a river aquifer and an accounting surface within the river aquifer. The river aquifer consists of permeable sediments and sedimentary rocks that are hydraulically connected to the Colorado River so that water can move between the river and the aquifer in response to withdrawal of water from the aquifer or differences in water-level elevations between the river and the aquifer. The subsurface limit of the river aquifer is the nearly impermeable bedrock of the bottom and sides of the basins that underlie the Yuma area and adjacent valleys. The accounting surface represents the elevation and slope of the unconfined static water table in the river aquifer outside the flood plain of the Colorado River that would exist if the river were the only source of water to the river aquifer. The accounting surface was generated by using water-surface profiles of the Colorado River from Laguna Dam to about the downstream limit of perennial flow at Morelos Dam. The accounting surface extends outward from the edges of the flood plain to the subsurface boundary of the river aquifer. Maps at a scale of 1:100,000 show the extent of the river aquifer and elevation of the accounting surface downstream from Laguna Dam in Arizona and California.
Publisher U.S. Geological Survey
Contributors Bureau of Reclamation
Date 2000
Type Text
Format application/pdf
Digitization Specifications pdf file copied from USGS website (http://az.water.usgs.gov/pubs/00-4085intro.html). Uploaded into CONTENTdm version 3.7.
Identifier http://az.water.usgs.gov/pubs/00-4085intro.html
Source Owen-Joyce, Sandra J.; Wilson, Richard P.; Carpenter, Michael C.; Fink, James B., Method to identify wells that yield water that will be replaced by water from the Colorado River downstream from Laguna Dam in Arizona and California, Tucson, Arizona: U.S. Geological Survey Water-Resources Investigation 2000-4085, 31 p.
Language eng
Rights Management Public Domain, Courtesy of the USGS
Holding Institution University of Utah
Metadata Cataloger Kristin Willmore
ARK ark:/87278/s6h130z6
Setname wwdl_er
Date Created 2005-08-10
Date Modified 2005-08-10
ID 1145887
Reference URL https://collections.lib.utah.edu/ark:/87278/s6h130z6
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