Is it true that a maximum rate of diversion might not be required for some onstream reservoirs?
Yes, it is true that a maximum rate of diversion might not be required for some onstream reservoirs. Adequate magnitude and variability in peak stream flows are needed to meet the habitat needs of anadromous salmonids, including maintaining stream channel geometry, vegetative structure and variability, gravel and wood movement, and other channel features. These peak stream flows are called channel maintenance flows. The maximum cumulative diversion criteria provides protection of channel maintenance flows. The draft policy proposes that the maximum cumulative diversion shall not cause more than 5% reduction in the 1.5 year flood flow. The maximum cumulative diversion criteria is a limitation on the sum of all of the rates of diversion of water in a watershed. Direct diversions and diversions to offstream storage already have rate of diversion terms placed in water right permits. Under the draft policy, a maximum rate of diversion will be required for most onstream dams. However there m
