Why does the draft policy have a maximum cumulative diversion criterion? How was the maximum cumulative diversion criterion developed?
The maximum cumulative diversion criterion allows for some water diversion to occur while still preserving the downstream natural flow variability needed for protection of fishery resources. The sum of the rates of diversion for diverters within a watershed cannot exceed the maximum cumulative diversion criterion. The draft policy proposes a maximum cumulative diversion criterion equal to five percent of the 1.5-year instantaneous peak flow. Adequate magnitude and variability in peak stream flows are needed to meet the habitat needs of anadromous salmonids, including maintaining steam channel geometry, vegetative structure and variability, gravel and wood movement, and other channel features. These peak stream flows are called channel maintenance flows. The bankfull flow is the flow at which channel maintenance is the most effective. The 1.5 year return peak flow is a hydrologic metric that can be used to estimate bankfull flow and effective channel maintenance flows. The 1.5-year inst
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