From – At the 2021 Bay-Delta Science Conference, Dr. Ted Sommer, the Lead Scientist for the CA Department of Water Resources, gave a short course on Delta hydrology, noting that hydrology is at the core of a lot of the work on science and management in the Delta and understanding the hydrodynamics in the system is necessary to be effective in the Delta.  This presentation aims to illustrate key points about the Delta, provide an understanding behind some regulatory criteria, and provide a simple conceptual model to help understand the general effects of future management changes. (more)