Yellowtail Dam Modeling Results Brian Marotz Hydropower Mitigation Coordinator.

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Presentation transcript:

Yellowtail Dam Modeling Results Brian Marotz Hydropower Mitigation Coordinator

Assumptions for this analysis Optimize reservoir refill during primary use period. Avoid elevations in the Flood Pool above Reduce the extent and duration of spill (>8 kcfs). Reservoir draft targets for each month, January through June, were based on water supply (April through July inflow volume). Dam discharges during fall based on similar wateryears and shaped to provide stable fisheries flows for primary river species.

Monthly Elevation Targets Based on Inflow Water Supply

Example of medium-low wateryear

Not Directly Comparable to GorQ

Comparison of Bighorn Reservoir Elevations

Comparison of Bighorn River Discharges

Comparison of Rule Curves and Historic Operations Rule curves reduced reservoir drawdown in all except the highest water years. Minimized the use of the flood pool, extent and duration. Spill was reduced in volume and duration. On. Bighorn River discharges remained more stable. Extremely low river flows (<1,500 cfs) were avoided.

Next step: Compare model results and optimize benefits.

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