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The objective of this study is to test different formulations with a new optimization

program. The area under study is located close to Los Angeles, and it has experienced a large

drawdown of the water table, with related subsidence. The analyses utilizes Ground Water

Management (GWM), a public domain code distributed by the USGS as a process within

MODFLOW 2000. The different algmithms within GWM were tested with a large-scale

transient unconfined system. The different analysis allowed the verification of the program. In

this application, GWM is used to optimize the resources, and the MODFLOW packages from the

LANOPT Model are used to simulate the system.