DSM2

The links are in chronological order, with most recent releases at the top.

• The Delta Simulation Model II (DSM2) is a is a river, estuary, and land modeling system. It is a one-dimensional mathematical model for dynamic simulation of one-dimensional hydrodynamics, water quality and particle tracking in a network of riverine or estuarine channels. DSM2 can calculate stages, flows, velocities, mass transport processes for conservative and non-conservative constituents including salts, water temperature, dissolved oxygen, and trihalomethane formation potential, and transport of individual particles. DSM2 thus provides a powerful simulation package for analysis of complex hydrodynamic, water quality, and ecological conditions in riverine and estuarine systems.
• DSM2 is licensed under the GNU General Public License. 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 GNU General Public License for more details. *For more information: water.ca.gov/Library/Modeling-and-Analysis/Bay-Delta-Region-models-and-tools/Delta-Simulation-Model-II
• **The latest version of the DSM2 executables is v8.5.0. The latest version of the model input is DSM2 Input 2026-06-29 historical update. This version of the input was developed with DSM2 v8.5.0.** Department of Water Resources (DWR) makes no warranties or guarantees -- either expressed or implied -- as to the completeness, accuracy, or correctness of the data herein (subject data), including any associated metadata. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data or reproductions of the subject data. Users are prohibited from any commercial, no-free resale, or redistribution without explicit written permission from DWR. Users should acknowledge DWR as the source used in the creation of any reports, publications, new data sets, derived products, or services resulting from the use of the subject data. DWR expressly disclaims any responsibility to defend or indemnify users against claims of others based on users' copying reliance, distribution, or other use of any of the subject data.