Nowhere in the updated draft of the Delta Water Quality Control Plan, which micromanages every channel and tributary in the Sacramento-San Joaquin watershed, is any attempt to quantify how much water pouring into the San Francisco Bay every year is enough to ensure ecosystem health. How is this not relevant?
Why is it, for example, that in the water year ended 9/30/2020, 7.0 million acre feet (MAF) flowed into the SF Bay and 3.5 MAF was pumped into the California and Delta Mendota aqueducts, but so far through 8/31/2026, with 12.9 MAF already flowed into the SF Bay, only 3.0 MAF made it into the California and Delta Mendota aqueducts? How is it that after four years of extraordinary rain, with reservoirs full, and a super El Nino on the way, with just a month left in our water year, we have only managed to pump 3.0 MAF south for our farms and cities?
Moving on, why is there no mention whatsoever in this “Water Quality Control Plan” of the need to restore flow capacity, especially in the south channels of the delta? While the plan is not meant to specify actual projects, it nonetheless mentions flood bypasses and tidal wetland projects, and it acknowledges the need to reduce the velocity of flows. So here’s a specific comment for the SWRCB, based on a simple calculation:
At an ideal downstream flow velocity of 4 feet per second for juvenile salmonids, a channel 2 feet deep and 100 feet wide can sustain a flow of 800 CFS. If that same channel is restored to an 8 foot depth, the same flow velocity will deliver 3,200 CFS downstream. This is yet another reason salmon thrived in a channelized environment during an entire century when dredging was permitted. These deeper channels, by the way, would ensure cooler water in the depths.
The intricacy of the processes described in this draft, and the number of stakeholders granted a role in those processes, guarantees that nothing will happen unless there is strong leadership. The SWRCB appears to retain that authority. Will they set big priorities and demand big results? Here are some recommendations:
Clean up the treatment plants along the SF Bay and delta waterways that discharge more than a half-million acre feet of nitrogen rich sewage every year. Do it by moving the effluent into new wetlands where marsh grass can absorb the nitrogen while creating fish habitat, and use the sediment from dredging to construct them.
Or go on with process for the sake of process. That is clearly a proven skill for our state’s water bureaucrats, and the more the merrier.
californiaglobe.com/fr/rings…