
The Orange County Coastkeeper has commissioned a white paper, "Making the Delta a Better Place for Native Fishes," claiming Governor Jerry Brown’s Delta Tunnels could help to restore Sacramento-San Joaquin River Delta fish if built.
The report is authored by Peter B. Moyle, John Durand and Carson Jeffres of the Center for Watershed Sciences, University of California, Davis.
The white paper recommends a number of positive things that can be done to restore nine Delta and longfin smelt, Sacramento River Chinook salmon and other fish species, ranging from habitat restoration to managing flows better.
However, the conclusion that has drawn fire from fish and public trust advocates is that the California WaterFix in its various manifestations has the following positive aspects for fishes:
Entrainment of delta smelt into the export pumps in the south Delta would be reduced because intakes would be upstream of current smelt habitat and would be screened. Other fishes will also be largely screened out of the tunnels.
Flows presumably can be better managed to reduce North-South cross-Delta movement of water to create a more East-West estuarine-like gradient of habitat, especially in the north Delta.
Large investments will be made in habitat restoration projects to benefit native fishes, including the various runs of salmon.
The authors do admit there are huge uncertainties associated with WaterFix, in terms of effects on fishes.
It is a giant experiment that may or may not work as promised, no matter what the models and experts say, the authors wrote. The giant fish screens needed for WaterFix to work, for example, will be pushing screening technology to the limit, and have to protect weak swimmers like smelt and juvenile sturgeon as well as juvenile salmon.
So the question is: what do we do if this giant experiment doesn’t work? Do the state and federal governments just let the impacted fish go extinct or do they take out or modify the tunnels and start over again?