Post on 17-Jul-2020
TDG UPDATE
Dan TurnerWater Quality Team LeadReservoir Control Center10 May 2019
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The DallesDam
Spillway
Power house
TDAtailwatergauge
TDA Forebaygauge
John Day Dam
Spillway
Power house
JDA Forebaygauge
JDA tailwater gauge
121.3%
120.8%
119.8%
117.8%40%
60%
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OTHER FACTORS CONSIDERED: DEGASSING
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105
110
115
120
125
130
135
4/10/2018 4/20/2018 4/30/2018 5/10/2018 5/20/2018 5/30/2018 6/9/2018 6/19/2018
TDG
(% sa
tura
tion)
The Dalles Dam
Tailwater gauge Forebay gauge
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The Dalles tailwater elevation (average = 79.7 feet)
Bonneville forebay elevation (average = 74.3 feet)
BONNEVILLE FOREBAY & THE DALLES TAILWATER
NOTE: Bonneville Dam forebay normal operating range = 71.5 - 76.5 feet
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Bonneville inflow forecast• May 10-19• Range: 260-340 kcfs• Average: 300 kcfs
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BON inflow = 300 kcfs• BON forebay avg = 74.3 ft• BON forebay decrease by
2 feet to 72.3 ft• BON forebay decrease of
2 feet = TDA tailwater decrease of 1.4 feet
BON inflow = 400 kcfs• BON forebay decrease of
2 feet = TDA tailwater decrease of 1.1 feet
BON inflow = 200 kcfs• BON forebay decrease of
2 feet = TDA tailwater decrease of 1.7 feet
76.5
71.5