
One of the most difficult ideas to get state and federal officials to acknowledge is that fish and marine life in our bay and ocean waters need fresh water flows to thrive and that diverting massive quantities of water to corporate agribusiness has caused major ecosystem collapses on the Sacramento-San Joaquin River and San Francisco Bay.
A major new study by the Bay Institute, "San Francisco Bay: The Freshwater – Starved Estuary," documents how the ecological health of San Francisco Bay and the nearby ocean is at high risk because large-scale water diversion in the Bay’s watershed severely limits the amount of fresh water that reaches the Bay and alters the timing of that flow.
Inflow to the Bay from its Central Valley watershed now averages less than half of what it would be without diversions; in some years just one-third of the runoff makes it to the Bay. The result is a nearly permanent drought for the Bay’s fish, wildlife, and their habitats. This radical alteration creates severe consequences for the Bay and marine ecosystems, and Bay Area residents pay the price, according to The Bay Institute.
The San Francisco Bay Estuary is created by the mixing of fresh water from the Central Valley’s rivers with salt water from the Pacific Ocean. Dramatically reducing the inflow of fresh water generates cascading effects in the Bay’s watershed, the Bay itself, and coastal ocean waters, the group stated.
The study shows how unsustainable diversion of the Bay’s freshwater inflow:
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Dramatically cuts production of fish and shrimp that are the food source for marine mammals, like Orca Whales, and birds.
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Allows pollutants to accumulate to dangerous levels and encourages blooms of toxic algae.
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Reduces sediment supply to Bay Area wetlands and beaches.
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Makes it easier for undesirable non-native species to successfully invade the Bay Estuary.
The study identifies four important approaches to improving Bay inflows:
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Update the State’s 21 year old water quality standards for the Bay Estuary to ensure adequate inflow.
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Require all those who divert water destined for the Bay, not just a subset, to contribute their fair share of fresh water to support benefits enjoyed by all Californians.
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Invest in local water supplies around the state including conservation.