LIBBY DAM STURGEON AND SUMMER OPERATIONSpweb.crohms.org/.../2017/0510_TMT_May_10th_Libby_Dam_Spring-S… · MAY 1ST WATER SUPPLY FORECAST AND BIOP OBJECTIVES • Libby Apr-Aug Inflow

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“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

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May 10th, 2017TMT Meeting

LIBBY DAM STURGEON AND SUMMER OPERATIONS

PRECIPITATION BY MONTH

October November December January

February March April

TEMPERATURES BY MONTH

October November December January

February March

Coldest winter since 1992 or 1984

April

PRIEST RIVERRECORDS (SINCE 1898)

Accumulated Precipitation since October, 2016 3rd

wettest 35.44””

Average 21.99”

Oct. Apr.

Record October Precip

Record February Precip

2nd

wettest March

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SOIL MOISTURE

MAY 1ST WATER SUPPLY FORECAST AND BIOP OBJECTIVES

• Libby Apr-Aug Inflow Forecast 8.2 MAF (140% of average0o Sturgeon Volume is 1.2 MAFo Bull trout minimum after the Sturgeon

Pulse – Aug 31 is 9 kcfso Current VarQ Flow 15.9 kcfs

• The Dalles WSF 110 MAFo Draft to 10 ft from full (2449 ft) end of

Sept

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Nov Dec Jan Feb Mar Apr May Jun

Spread of values around expected forecast

99% whisker

20%-80% bounds

5%

1% whisker

30-yr average

OPERATIONS TO SUPPORT KTOI REQUEST

• Operate to 6 kcfs in Sept• Need reservoir to 2449 ft end of August

o Sept Ave inflow ~6 kcfs

• Look to refill Libby Dam late July to Early August

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Coordinated Ops through May 5th with BC Hydro – 2359 ft

Sturgeon Pulse 1.2

MAFSummer Flat flow ~ 15.6 kcfs

Refill in late summer

2449 ft end of Aug

6 kcfs for Sept

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QUESTIONS?

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