A Statewide Economic Optimization Model for California II: Model and Results

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by Andy Draper,
Jay Lund,

Document Type: Proceeding Paper

Part of: WRPMD'99: Preparing for the 21st Century

Abstract: (No paper) Traditionally simulation models have been used for multi-reservoir operation studies. More recently deterministic optimization models have been used to identify promising alternatives to existing operating policies. This paper discusses the use of a network flow optimization model to represent California's inter-tied water supply and demand system. The physical infrastructure is represented by an interconnected system of arcs and nodes. Storage nodes represent either surface or groundwater storage. Junction nodes provide for the interconnection of arcs representing stream, channel or groundwater low. Agricultural demand is aggregated into 26 major regions. A time series of surface and groundwater inflows have been developed at the system boundaries. These flows represent historic flows adjusted for land use changes in the upstream basin and projected operation of any upstream reservoirs. The development of a set of input criteria is discussed. These include establishing initial and final storage conditions and constraints on groundwater extraction and recharge. The model base run corresponds to the allocation of water under the existing system of water rights and long-term supply contracts subject to meeting existing environmental standards and physical capacity constraints. Results are compared with more complex simulation models developed by California's Department of Water Resources and the US Bureau of Reclamation.

Subject Headings: Optimization models | Simulation models | Hydrologic models | Economic factors | Water reclamation | Groundwater | Water storage | North America | California | United States

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