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Bay-Delta Office
Department of Water Resources

1416 9th Street,
Sacramento, Ca 95814

Mailing Address:
P. O. Box 942836,
Sacramento, Ca 94236-0001

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 Water Resource Integrated Modeling System 2


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 WRIMS 2.0 software may be downloaded at the following links and unzipped to the local computer.


WRIMS 2 includes an open source Cbc solver and a commercial solver XA which needs the users to purchace the license.

To purchase the license of XA solver, please contact Sunset Software Technology.

To use WRIMS 2 software, users may refer to the following reference documents.

WRIMS 2 GUI Quick Start Guide


WRESL Language Reference

WRESL+ Language Reference

WRIMS is copyrighted by the State of California, Department of Water Resources. It is licensed under the GNU General Public License, version 3. This means it can be copied, distributed, and modified freely, but you may not restrict others in their ability to copy, distribute, and modify it. See the License for more details.

To join the email list for WRIMS 2 updates, please send email to WRIMS 2 Developer Group.

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