NOAA Fisheries Service Northwest Fisheries Science Center Fish Ecology Division
description
Transcript of NOAA Fisheries Service Northwest Fisheries Science Center Fish Ecology Division
Behavior and Survival for Juvenile Salmonids Passing Ice Harbor Dam during reduced and BiOp
spill treatments, 2006-07
NOAA Fisheries ServiceNorthwest Fisheries Science Center
Fish Ecology Division
U. S. Army Corps of EngineersNorthwestern Division
Walla Walla District
Gordon Axel, Eric Hockersmith, and Darren Ogden
Results - Ice Harbor Dam Spring Operations
2006 (High Flow)Reduced BiOp
2007 (Low Flow)Reduced BiOp
Total River Flow (kcfs) 120 144 75 79
Mean Training Spill (kcfs) 32 76 15 46
% Spill Training 26% 52% 20% 58%
Mean RSW (kcfs) 8 8 8 8
% RSW Spill 7% 6% 11% 10%
Results - Yearling Chinook Salmon: First Approach20
0720
06
BiOp Spill Reduced Spill
% at non-turbine routes: 88% % at non-turbine routes: 80%
% at non-turbine routes: 87% % at non-turbine routes: 80%
2007
2006
BiOp Spill Reduced Spill
% thru non-turbine routes: 95% % thru non-turbine routes: 93%
% thru non-turbine routes: 92%% thru non-turbine routes: 98%
Results - Yearling Chinook Salmon: Passage Distribution
2007
2006
BiOp Spill Reduced Spill
% at non-turbine routes: 91% % at non-turbine routes: 83%
% at non-turbine routes: 96% % at non-turbine routes: 88%
Results – Juvenile Steelhead: First Approach
BiOp Spill Reduced Spill
2007
2006
% thru non-turbine routes: 99% % thru non-turbine routes: 98%
% thru non-turbine routes: 99%% thru non-turbine routes: 99%
Results – Juvenile Steelhead: Passage Distribution
Survival Results – Yearling Chinook Salmon
2006 (High Flow)Reduced BiOp
2007 (Low Flow)Reduced BiOp
Spill Survival 96% 96% 97% 96%
RSW Survival 95% 96% 95% 95%
Dam Survival 91% 92% 94% 92%
Concrete Survival 96% 96% 95% 96%
Forebay Delay (h) 1.8 1.1 2.0 1.5
Survival Results – Juvenile Steelhead
2006 (High Flow)Reduced BiOp
2007 (Low Flow)Reduced BiOp
Spill Survival 100% 100% 97% 97%
RSW Survival 100% 98% 97% 98%
Dam Survival 90% 94% 94% 93%
Concrete Survival 100% 100% 97% 96%
Forebay Delay (h) 1.9 1.1 1.8 1.7
Results - Ice Harbor Dam Summer Operations
2006 (High Flow)
Total River Flow (kcfs) 56
Mean Training Spill (kcfs) 22
% Spill Training 40%
Mean RSW (kcfs) 8
% RSW Spill 14%
Results - Subyearling Chinook Salmon: First Approach
% at non-turbine routes: 93%
Results - Subyearling Chinook Salmon: Passage Distribution
% thru non-turbine routes: 98%
Survival Results – Subyearling Chinook Salmon
2006 (High Flow)
Spill Survival 99%
RSW Survival 98%
Dam Survival 95%
Concrete Survival 98%
Forebay Delay (h) 2.0
Conclusions• No difference in survival by species, treatment, or flow
years
• BiOp spill slightly reduces forebay residence; though does not significantly alter forebay loss
• Increasing percentage of river flow through RSW by 4% increased passage through RSW by 8% for yearling Chinook and 36% for steelhead
• Increasing the forebay depth by one foot at Ice Harbor could increase percentage of flow through the RSW by 2% during a high flow year and 3% during a low flow year