libby dam sturgeon and summer...
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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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0
1000
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4000
5000
6000
7000
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9000
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12000
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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