Bay-Delta Region models and tools

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.
The Bay-Delta SCHISM is  an open source computer sofware simulating the three dimensional water flow and water quality in the San Francisco Bay Delta estuary. It has been used to study a wide range of physical and biological processes in the Bay/Delta, such as saltwater intrusion, tempory barrier operation, flood inundation, sediment transport, and fish migrations. The project is a collaboration between the California Department of Water Resources and the Virginia Institute of Marine Sciences (VIMS).
The Delta Island Consumptive Use (DICU) model simulates the island monthly consumptive uses, corresponding island water supplies, and the channel diversion, seepage and return volumes for each of 142 islands in the Sacramento-San Joaquin Delta, using the information of land use, historical precipitation, and agricultural activities. Based on the island results, it assigns the channel water volumes of each island and water quality concentrations to the DSM2 nodes, which the Delta flow and water quality models require.
Delta Evapotranspiration of Applied Water (DETAW) model estimates the daily evapotranspiration of applied water, which is the water demand for crop evapotranspiration minus water supplied by effective rainfall and effective seepage, on each of 168 islands in the Sacramento-San Joaquin Delta, using the annual information of land use, daily temperature, and daily precipitation. The effective rainfall and seepage are the water amounts crops consume, not the actual rainfall and seepage. Version 1.0 produced the island applied water, effective rainfall, effective seepage and other terms related to the ground surface water balance on each island. Version 2.0 modified the Version 1.0 code and converted the island results to the diversion, seepage, and drainage on DSM2 nodes according to the similar algorithm in DICU.
Delta Channel Depletion (DCD V1.0) is an extension of Delta Evapotranspiration of Applied Water (DETAW V2.0). Based on the estimation of Delta root zone water balance by DETAW V2.0, DCD V1.0 estimates the actual daily Delta hydrology and channel depletions, including diversions, drainages, and seepages, on each of 168 Delta islands. DCD V1.0 considers the impacts of Delta lowlands subsurface water, uplands groundwater, runoff, and farming practices in addition to the factors included in DETAW V2.0. The current simulation of historical conditions by DCD V1.0 covers 1922 through 2016.

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