Post on 18-Jan-2016
transcript
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Powerdale Damage Assessment
November 14, 2006
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Based on Provisional Data. Gaging equipment suffered some malfunction during this event so hydrograph likely does not resemble rising limb. USGS is in the process of reconstructing this event.
Hood River at Tucker Bridge (USGS)Flow Event, 11/6/06 - 11/7/06
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5000
10000
15000
20000
11/6
/2006 0
:00
11/6
/2006 4
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11/6
/2006 8
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11/6
/2006 1
2:0
0
11/6
/2006 1
6:0
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11/6
/2006 2
0:0
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11/7
/2006 0
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11/7
/2006 4
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11/7
/2006 8
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11/7
/2006 1
2:0
0
11/7
/2006 1
6:0
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/2006 2
0:0
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11/8
/2006 0
:00
Flo
w (
cfs)
2 - Powerdale Flood Damage 11/9/2006
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Silt at fish ladder
Entrance to fish ladder
Sorting facility fish return pipes
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Fish ladder
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Auxiliary fish ladder pump out of service
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Sand traps full of sediment
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Collapsed 10’ dia. wood stave flowline – 490’
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Steel flowline – 325’
– 170’ collapsed
– 155’ slid north 5 inches failing foundations
Walkway section lost downstream – location unknown
Foundation washed ¼ mile downriver
Flow
7 - Powerdale Flood Damage 11/9/2006
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Collapsed steel flowline –325’ requiring replacement
6 failed foundationsCracked supports (6 total) & slid pipe
170’155’
High water mark
8 - Powerdale Flood Damage 11/9/2006
Damaged Seawall
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Cracked flowline foundations – 6 total
Crack at cold joint
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Sediment deposit at tailrace
River
Tailrace
Sediment deposit 6’ - 10’ above normal
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Powerhouse Switchyard
Chemical Storage
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Powerhouse Shop
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Powerhouse Shop
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13 - Powerdale Flood Damage 11/12/2006
Former River Channel