Kootenai Basin Spring/SummerOperations for 2016

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Presentation transcript:

Kootenai Basin Spring/SummerOperations for 2016 Joel Fenolio, P.E. Upper Columbia Senior Water Manager 11 May 2016

Atmospheric river intense, focused, steady rainfall with high snow levels Atmospheric river intense, focused, steady rainfall with high snow levels

April record warmth and dry Atmospheric river intense, focused, steady rainfall with high snow levels Atmospheric river intense, focused, steady rainfall with high snow levels Bonners Ferry: Warmest April on record Snowpack drops well below normal in a month With warmth, rapid snowmelt in April Now less snowmelt and with dry weather: Runoff decreases

Snowpack Story for 2016

Libby Dam Apr-Aug May Inflow Forecast Corps forecast is 5.8 MAF (99% or average) 5900 KAF is the average Apr-Aug inflow volume

BiOp Requirements and Habitat Operations Libby WSF of 5.8 MAF sets the following: Sturgeon Volume of 0.93 MAF As measured above 4 kcfs Bull Trout Minimum after the pulse through August 31st is 7 kcfs Habitat Operations 6 kcfs minimums in Sept Target 2449 ft end of August rather than end of Sept

Moderate ESP Inflow Scenario 2449 ft end of August Refill end of July Will be updated next week 7.8 kcfs flat flow 0.93 MAF Sturgein Pulse

Dry Inflow Scenario Below 2449 ft end of August Refill end of July 0.93 MAF Sturgein Pulse 7 kcfs flat flow

Summary Timing of Inflows shifted up by 4 to 6 weeks Flood Risk low – based on the below average snowpack Libby Dam will likely not refill to 2452 to 2454 feet this summer Anticipated timing of refill late July to August Seattle District is currently looking at refilling earlier than late July June precipitation is the wild card in terms of flood risk and refill

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