SAN JOAQUIN RIVER Dissolved Oxygen Total Maximum Daily Load Stakeholder Process

April 13, 2000

Attending: Russ Brown (JSA), Carl Chen (Systech Engineering), Francis Chung (DWR), Hari Rajbhardi (DWR), Paul Hutton (DWR), G. Fred Lee (DWR), Peggy Lehman (DWR), Paul Marshall (CALFED), Parvis Nader (DWR), Thomas Pate (DWR), Nigel Quinn (USBR), Sanjaya Seneviratne (DWR), Kevin Wolf (facilitator and notes 530-758-4211, kjwolf@dcn.davis.ca.us)

1. The TMDL Stakeholders will use DSM2 as their base computer model for upstream modeling of hydrodynamics and nutrient-algal and organic carbon dynamics.
2. The Systech Engineering proposal for the Stakeholders 2001 CALFED grant will be to work with DWR staff to advance and calibrate their dissolved oxygen model. This model will then provide data for the model he is developing for downstream of Vernalis to the DWSC. Systech will help with the development of screening criteria for the data and assumptions for the DSM2 model.

1. If more sensors and monitoring stations are needed, Nigel Quinn’s group (SJR Real Time Monitoring) will help.
2. Thomas Pate is working on the hydrodynamic modeling upstream of Vernalis. He hopes to finish calibrating the model in 2-4 months. Some of the attributes of the modeling he is doing include:

1. It is based on the real geometry of the channel.
2. It has numerous nodes (60?), each at a major diversion or discharge location.
3. It models in 15-minute time stems for flow, stage and velocity.
4. It captures travel times better
5. It extends upstream from Mud Slough to Vernalis downstream.
6. It presently uses groundwater inflows from 1985 studies.

1. Getting good data for the model will be very valuable. The more frequently the data was taken, the better, but almost any data will help. For example, data on diversions from the river, especially in dry years would be very helpful.
2. Management of the Grasslands wetlands has changed over time so past data will not accurately show its current impacts. Monitoring and modeling the Sept – Nov. discharges from this area may show an important relationship to downstream DO levels.
3. Hari is working on the DSM2 DO model with an emphasis on nutrient cycling kinetics. He hopes to have a first round of calibration done for August – November 1998 data by the end of summer. One concern is that 1998 was an unusually high water year so it may not help as much with other lower water years.
4. Developing good source loading coefficients will be a major part of the calibration effort.

3. Important contacts:

Carl Chen <carl@systechengineering.com>

Nigel Quinn <nwquinn@lbl.gov>

GroberL@rb5s.swrcb.ca.gov

Thomas L. Pate <tpate@water.ca.gov>

Paul Hutton <hutton@water.ca.gov>

Hari Rajbhardi <Hari@water.ca.gov>

Parviz Nader <parviz@water.ca.gov>

Sanjaya Seneviratne <sanjaya@water.ca.gov>

Francis Chung <chung@water.ca.gov>