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Optimal Management of Groundwater Basins of Degraded Water Quality for Conjuctive Use
Kimberly A. Stapp-Alexander, University of California, Irvine
Gary L. Guymon, University of California, Irvine
UC Water Resources Center Technical Completion Report W-809
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ABSTRACT: In Southern California and elsewhere in heavily populated arid areas, existing
potable water delivery and supply systems are increasingly being overtaxed in meeting
current and projected water demands, both on an annual and peak demand basis. In a
number of cases, such as portions of Riverside County, Southern Orange County, and San
Diego County, numerous small groundwater basins, often with degraded water quality,
could be integrated into the local water delivery systems providing new water supply and
storage elements to the systems. Several water agencies in Southern California are already
trying to accomplish this, however, the complex dynamic nature of the problem make it
difficult to assess costs and benefits and to select the optimal alternative.
The purpose of this research is to analyze management alternatives and to develop
methods for evaluating costs and benefits in order to optimize the use of these
groundwater basins for conjunctive use. The San Juan Basin, located in Southern Orange
County, was used as a basis for this research. A mathematical model of the basin was
used to evaluate the basin as a storage element for sustained yield, drought emergency
reserves, and summer peaking supply. Simulations were also conducted in order to
determine the effect of pumping on groundwater TDS. Based on the simulation results,
functions for IDS versus yield were developed. These functions were incorporated into
an optimization algorithm developed to minimize the cost of water production for
specified yield amounts. The results of this procedure for various yield amounts were
compared in order to choose a management scheme which provides as much additional
potable water as possible for seasonal use while keeping the cost of production
comparable with the prices of imported water. Results indicate that groundwater
production is economical when compared to importing water.
SUGGESTED CITATION:
Kimberly A. Stapp-Alexander and Gary L. Guymon,
"Optimal Management of Groundwater Basins of Degraded Water Quality for Conjuctive Use"
(January 1, 1995).
University of California Water Resources Center.
Technical Completion Reports.
Paper 809.
http://repositories.cdlib.org/wrc/tcr/809
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