OVERVIEW

The Water Resource Integrated Modeling System (WRIMS model engine or WRIMS) (formally named CALSIM) is a generalized water resources modeling system for evaluating operational alternatives of large, complex river basins. WRIMS integrates a simulation language for flexible operational criteria specification, a linear programming solver for efficient water allocation decisions, and graphics capabilities for ease of use. These combined capabilities provide a comprehensive and powerful modeling tool for water resource systems simulation. The latest available version is 1.2.4b.

CalSim is the model used to simulate California State Water Project (SWP)/Central Valley Project (CVP) operations. CalSim-II is the latest version of CalSim available for use.

Together, WRIMS and CalSim replaced the Department of Water Resources' planning model of the State Water Project/Central Valley Project system, DWRSIM. Unlike DWRSIM, in which the engine and model were tightly coupled, the entire system and related operational criteria in CalSim, are specified as input to WRIMS and may be modified or replaced without requiring changes in WRIMS.

WRIMS and CalSim are products of joint development between DWR and Bureau of Reclamation.