San Joaquin River Dissolved Oxygen Total Maximum Daily Load Conceptual Model Home Page. The RWQCB is in the process of issuing a TMDL under Section 303(d) of the Clean Water Act for the lower San Joaquin River for DO. The CVRWQCB and the California Bay-Delta Authority have sponsored the creation of two web-based conceptual models as tools to understand the physical and chemical conditions in the river that lead to episodes of low DO concentrations and the effects of these low DO episodes on the biological and ecological resources in the river.

Conceptual Model for Organic Carbon in the Central Valley and Sacramento-San Joaquin Delta (PDF). Prepared as part of an ongoing multi-year effort to develop a drinking water policy for surface waters in the Central Valley.