DDMMON#6. Duncan Dam Bull Trout Passage Monitoring 2009 Annual Data Summary
Author: T. Oussoren
This monitoring program was initiated in 2008 for three years. The operation of the Bull trout transfer program at Duncan Dam May to September each year allows the migration of Bull trout from the Lower Duncan River to spawning locations in the Upper Duncan River system (upstream of Duncan Dam). Fish passage at Duncan Dam is facilitated through the installation of a weir immediately downstream of the flip bucket of the Low Level Operating Gate. In 2012, it was concluded that the existing weir was an effective system for ensuring Bull trout passage through the dam. The second objective of this study was to evaluate alternative passage methods. In 2011, redesign and automation of the weir was proposed primarily for operational flexibility and safety reasons. After 2011, the weir was damaged and has not been used since. As implementation of the improvements to update the weir is outside of the scope of the Duncan Dam Project water use plan, BC Hydro commenced with design phases of the project under the regular capital planning process.
As outlined in Thorleys (Poisson 2010) summary memo (Appendix A), based on bull trout transfer data collected since 1995, the weir immediately downstream of LLOG#2 facilitates the movement of smaller bull trout into the flip bucket. The above referenced conclusion answers Management Question 1: Does the weir installed downstream of the entrance of LLOG#2 improve access for bull trout migrating to the Upper Duncan system?. Thorley goes further to suggest that the weir be installed in all years regardless of river conditions (e.g. low or high tail-water conditions). Based on data collected from the 2009 bull trout transfer program in combination with Thorleys analyses (Appendix A) it is recommended that the WLR component of the bull trout transfer monitoring program continue to Management Question (2) of the program: If the weir is required for maintaining diversity in the bull trout spawning population, is there an alternate design that could be implemented that would improve operating conditions?
As outlined in Thorleys (Poisson 2010) summary memo (Appendix A), based on bull trout transfer data collected since 1995, the weir immediately downstream of LLOG#2 facilitates the movement of smaller bull trout into the flip bucket. The above referenced conclusion answers Management Question 1: Does the weir installed downstream of the entrance of LLOG#2 improve access for bull trout migrating to the Upper Duncan system?. Thorley goes further to suggest that the weir be installed in all years regardless of river conditions (e.g. low or high tail-water conditions). Based on data collected from the 2009 bull trout transfer program in combination with Thorleys analyses (Appendix A) it is recommended that the WLR component of the bull trout transfer monitoring program continue to Management Question (2) of the program: If the weir is required for maintaining diversity in the bull trout spawning population, is there an alternate design that could be implemented that would improve operating conditions?
Resources Data:
Name: DDMMON-6__YR2_2010-06-01
Format: PDF
URL: https://www.bchydro.com/content/dam/hydro/medialib/internet/documents/planning_regulatory/wup/southern_interior/2011q1/ddmmon-6__yr2_2010-06-01.pdf
Additional Info
Study Years: 2010, 2009, 2008
Published: 2010
DDMMON#6. Duncan Dam Bull Trout Passage Monitoring 2009 Annual Data Summary
Author: T. Oussoren
Tags: Bull Trout, DDMMON6, Duncan Dam, Duncan Reservoir, Fish Passage, Fish Weir, Flow, Movements, Operational Recommendations, Reservoir Operations, Salvelinus Confluentus, Transfer Program, WLR
This monitoring program was initiated in 2008 for three years. The operation of the Bull trout transfer program at Duncan Dam May to September each year allows the migration of Bull trout from the Lower Duncan River to spawning locations in the Upper Duncan River system (upstream of Duncan Dam). Fish passage at Duncan Dam is facilitated through the installation of a weir immediately downstream of the flip bucket of the Low Level Operating Gate. In 2012, it was concluded that the existing weir was an effective system for ensuring Bull trout passage through the dam. The second objective of this study was to evaluate alternative passage methods. In 2011, redesign and automation of the weir was proposed primarily for operational flexibility and safety reasons. After 2011, the weir was damaged and has not been used since. As implementation of the improvements to update the weir is outside of the scope of the Duncan Dam Project water use plan, BC Hydro commenced with design phases of the project under the regular capital planning process.
Summary
As outlined in Thorleys (Poisson 2010) summary memo (Appendix A), based on bull trout transfer data collected since 1995, the weir immediately downstream of LLOG#2 facilitates the movement of smaller bull trout into the flip bucket. The above referenced conclusion answers Management Question 1: Does the weir installed downstream of the entrance of LLOG#2 improve access for bull trout migrating to the Upper Duncan system?. Thorley goes further to suggest that the weir be installed in all years regardless of river conditions (e.g. low or high tail-water conditions). Based on data collected from the 2009 bull trout transfer program in combination with Thorleys analyses (Appendix A) it is recommended that the WLR component of the bull trout transfer monitoring program continue to Management Question (2) of the program: If the weir is required for maintaining diversity in the bull trout spawning population, is there an alternate design that could be implemented that would improve operating conditions?