The grid on a Google Earth base map
The San Francisco Bay-Delta system is complex in its physical and environmental dynamics. Modeling tools that integrate hydrodynamics and water quality dynamics are essential to unravel the governing processes on various spatial and temporal scales and assess potential developments due to climate change and adapting management strategies. There is a need for open access, publicly available, integrated modeling platforms to facilitate and enhance interdisciplinary and interagency scientific communication, collaboration, and understanding.

This website provides a platform for availability and continuous development of a process-based, hydrodynamic surface water flow model applying the Deltares Delft3D FM (flexible mesh) software describing the San Francisco Bay-Delta system. The domain covers an area from Point Reyes up to the tidal limits near Sacramento and Vernalis. A high resolution mesh ultimately allows for detailed computations of

  • flow (including salinity and temperature)
  • sediment transport (sand and mud transport, suspended sediment concentration, turbidity, morphodynamics)
  • water quality (including turbidity, phytoplankton, nutrients, and contaminants) and
  • eco-systems (habitat indicators)

A Delft3D curvilinear grid model for the Bay Delta is available at


Please contact d3d-baydelta Support for further inquiries on the model.