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Emergency use of groundwater as a backup supply: Quantifying hydraulic impacts and economic benefits

Water Resources Research

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Abstract

Groundwater can play an important role in water-supply emergency planning. A framework is presented for assessing the hydraulic impacts and associated costs of using groundwater as a backup supply when imported-water deliveries are disrupted, and for quantifying the emergency benefits of groundwater management strategies that enable better response to such disruptions. Response functions are derived, which relate additional groundwater pumpage during water-supply emergencies to impacts such as increased pumping costs, subsidence, and seawater intrusion. Monte Carlo analysis is employed to estimate the incremental costs of using groundwater as a backup supply. The emergency benefits of alternative groundwater management strategies are computed for different expected durations of imported water disruption, percentages of imported water replaced by groundwater, and threshold drawdowns for subsidence impacts. The methodology is applied to the coastal Los Angeles Basin. For this case study, emergency benefits of artificial recharge strategies are dominated by reduction of potential subsidence costs. The variance of the results also is primarily due to subsidence effects. Incorporation of probability distributions reflecting a larger expected use of groundwater during the imported-water disruption results in higher estimated emergency benefits of artificial recharge strategies. The framework presented for quantifying incremental costs and economic benefits of using groundwater as a backup supply could be applied to a broad range of water emergency planning decisions.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Emergency use of groundwater as a backup supply: Quantifying hydraulic impacts and economic benefits
Series title:
Water Resources Research
Volume
46
Year Published:
2010
Language:
English
Publisher:
American Geophysical Union
Publisher location:
Washington, DC
Contributing office(s):
California Water Science Center
Description:
20 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Research
Number of Pages:
20
Country:
United States
State:
California
County:
Los Angeles
Other Geospatial:
Central Basin;West Coast Basin;Los Angeles Basin