ALP 3

Contents
sea level, every 33 ft increment in water depth is equal to an additional 1 atm of pressure
equaling an additional 14.7 pounds per square inch (psi) of pressure. However, at 6,800 ft above
mean sea level, atmospheric pressure increases by a factor of one for every 26.7 ft of additional
water depth (W. Frizell, personal comm. 2009). From the centerline elevation of the sleeve
valve at 6712 ft to the normal fill elevation of 6882 ft, atmospheric pressure (called hydrostatic
pressure beneath the water surface) increases from 0.78 atm to 7.1 atm. at full pool. Atmospheric
pressure at the normal fill elevation will exceed 7 atm; thus tests concluded at or near 6878 ft (7
atm), four feet below the normal fill line of 6882 ft.
r Trials Performed I Reservoir I Reservoir I Depth " FAWated I Estimated
I (bold) Elevation Depth SleeveYBlve Atmosphet'1cPressure psi @ 10% Open
Centerline of Sleeve Valve
6712
6825
0'
0.78
Reservoir Bottom
6730
June 2010 Trials
1$ `
1.45
98
Sill Elevation
6771
5.1
50
3.0
June 2009 Trials
6775
4,
63
3.1
27
Aug 2009 Trials
6795
65 r
83
3.9
36
6.0
6798
A _ 1.2011 Trials
'4♦Q
1 5
Minimum Pool
68U1
71 -
89
41
April 2010 Trials ; -
6805 "; ' ;.
75
93 ; .,
4.3
41
Table 1. Lake NighthMe servoir elevations tested for sleeve valve passage survival and
approximate pressures.
Related research at the Pacific Northwest National Laboratory found that fall Chinook salmon,
rainbow trout, and bluegill experienced a range of survival and types of injuries resulting from
specific pressure changes. Their research revealed that about 50 percent of bluegill died from a
ruptured swim bladder while only 10 percent of Chinook salmon had the same lethal injury. No
rainbow trout experienced a ruptured swim bladder but a few test species exhibited excessive
floating due to an over - inflated swim bladder. In addition, some Chinook salmon and rainbow
Page 12
6825
5.0
June 2010 Trials
6828
98
''136
5.1
50
5.8
58
6852
6.0
A _ 1.2011 Trials
6$55
1 5
143
6.1
62
June **,Trials
6874 .
1471 -
165
7.0
71
Full Pool
688j',';
152
170
7.1
74
Table 1. Lake NighthMe servoir elevations tested for sleeve valve passage survival and
approximate pressures.
Related research at the Pacific Northwest National Laboratory found that fall Chinook salmon,
rainbow trout, and bluegill experienced a range of survival and types of injuries resulting from
specific pressure changes. Their research revealed that about 50 percent of bluegill died from a
ruptured swim bladder while only 10 percent of Chinook salmon had the same lethal injury. No
rainbow trout experienced a ruptured swim bladder but a few test species exhibited excessive
floating due to an over - inflated swim bladder. In addition, some Chinook salmon and rainbow
Page 12