Canadian Dam Association Bulletin - Fall 2016 - 17

On the morning of January 17, 2015 work began on the repair shortly after 10:00 AM once it was confirmed that everyone had been evacuated. The excavator operator carefully started placing rock in the first downstream baffle and proceeded upstream and through the dam. Work progressed nicely without any issues and by early afternoon, all of the baffles were filled and the fish ladder was stabilized. All work was completed by late afternoon and the evacuation order was lifted at 5:00 PM as promised and residents could return to their homes. As a result of the repair work, the fish ladder was no longer operational. One of the conditions of the approval issued by Nova Scotia Environment to carry out the repair required Halifax Water to reinstate fish passage before the spring run of gaspereau, which are a species of herring found in North America. A temporary fish ladder was ruled out due to the risks of excavating in and around the existing dam, the winter construction conditions, the physical constraints of the site, and the structural integrity of the dam. Halifax Water considered technologies available for fish passage and selected an innovative fish pumping system. Fish pumps are commonly used in the fishing industry to move large quantities of live fish, but, (to our knowledge) this is the first application in Atlantic Canada as an active fishway. The fish pump operates by drawing fish from a downstream pool into a vacuum tank. Once the tank is full, a positive pressure is applied to push the fish into the upstream lake. The system adapted technology used in commercial fisheries and was manufactured by Inventive Marine Products Ltd. of Nova Scotia. Modifications were made to the system to increase fish safety throughout the process and a siphon system was designed, in conjunction, to provide the necessary attraction water. During the migration period, Envirosphere Consulting Ltd. and CEF Consultants Ltd. were Canadian Dam Association * Fall 2016 contracted to operate the fish pump system. After several weeks of trial and error with the inlet location and the suction pipe size, the fish pump successfully lifted over 30,000 gaspereau over the dam. In 2016, during the spring gaspereau run, over 30,000 fish were once again lifted over the dam using the fish pump. It is expected that the fish pump will be utilized for the next several years until a new dam with a permanent fish ladder has been constructed. REPLACEMENT CONCEPT Halifax Water's objective was to find a design solution for the Lake Major Dam replacement to provide: * Efficient operation and maintenance resulting in least cost O&M for such items as: labour, materials, and energy; * Minimal capital reinvestment during the life of the asset; * Positive impact on the environment; and * Compliance with regulations. RYGENEFOSSEN HYDROPOWER PLANT Arendal, Norway Smith-Root designed and installed an electric fish barrier in the tailrace of the Rygenefossen Hydropower Plant, diverting migrating fish species away from the tunnel outlet during their annual upstream migration. WE PROVIDE EXPERTISE AND TECHNOLOGY FOR: ‡&RQWrolling the spread of invasive species ‡&RPSrehensive watershed management ‡)LVKHQWrainment and impingement prevention ‡6DIHILVKSDVVage ‡(QGDQgered species recovery MORE HYDROPOWER SOLUTIONS AT: www.smith-root.com/barriers/hydro WWW.SMITH-ROOT.COM info@smith-rRRWFRP‡  ‡Vancouver, Washington, USA 790555_SmithRoot.indd 1 1/24/16 17 3:01 PM http://www.smith-root.com http://www.smith-root.com/barriers/hydro http://WWW.SMITH-ROOT.COM

Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Fall 2016

Board of Directors
Board of Directors Nominations
Remedial Work at Lake Major Dam
CDA Conference Report: Otto Holden Generating Station Alkali-Aggregate Reaction Investigation
DSR Bulletin
Icold Corner
Notice of Annual General Meeting
Call for Papers, 2017 Conference
Young Professional Activities
Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Fall 2016 - cover1
Canadian Dam Association Bulletin - Fall 2016 - cover2
Canadian Dam Association Bulletin - Fall 2016 - 3
Canadian Dam Association Bulletin - Fall 2016 - 4
Canadian Dam Association Bulletin - Fall 2016 - 5
Canadian Dam Association Bulletin - Fall 2016 - 6
Canadian Dam Association Bulletin - Fall 2016 - Board of Directors
Canadian Dam Association Bulletin - Fall 2016 - 8
Canadian Dam Association Bulletin - Fall 2016 - Board of Directors Nominations
Canadian Dam Association Bulletin - Fall 2016 - Remedial Work at Lake Major Dam
Canadian Dam Association Bulletin - Fall 2016 - 11
Canadian Dam Association Bulletin - Fall 2016 - 12
Canadian Dam Association Bulletin - Fall 2016 - 13
Canadian Dam Association Bulletin - Fall 2016 - 14
Canadian Dam Association Bulletin - Fall 2016 - 15
Canadian Dam Association Bulletin - Fall 2016 - 16
Canadian Dam Association Bulletin - Fall 2016 - 17
Canadian Dam Association Bulletin - Fall 2016 - 18
Canadian Dam Association Bulletin - Fall 2016 - 19
Canadian Dam Association Bulletin - Fall 2016 - 20
Canadian Dam Association Bulletin - Fall 2016 - 21
Canadian Dam Association Bulletin - Fall 2016 - 22
Canadian Dam Association Bulletin - Fall 2016 - 23
Canadian Dam Association Bulletin - Fall 2016 - 24
Canadian Dam Association Bulletin - Fall 2016 - 25
Canadian Dam Association Bulletin - Fall 2016 - CDA Conference Report: Otto Holden Generating Station Alkali-Aggregate Reaction Investigation
Canadian Dam Association Bulletin - Fall 2016 - 27
Canadian Dam Association Bulletin - Fall 2016 - 28
Canadian Dam Association Bulletin - Fall 2016 - 29
Canadian Dam Association Bulletin - Fall 2016 - 30
Canadian Dam Association Bulletin - Fall 2016 - 31
Canadian Dam Association Bulletin - Fall 2016 - 32
Canadian Dam Association Bulletin - Fall 2016 - 33
Canadian Dam Association Bulletin - Fall 2016 - 34
Canadian Dam Association Bulletin - Fall 2016 - 35
Canadian Dam Association Bulletin - Fall 2016 - 36
Canadian Dam Association Bulletin - Fall 2016 - 37
Canadian Dam Association Bulletin - Fall 2016 - DSR Bulletin
Canadian Dam Association Bulletin - Fall 2016 - Icold Corner
Canadian Dam Association Bulletin - Fall 2016 - 40
Canadian Dam Association Bulletin - Fall 2016 - Notice of Annual General Meeting
Canadian Dam Association Bulletin - Fall 2016 - Call for Papers, 2017 Conference
Canadian Dam Association Bulletin - Fall 2016 - 43
Canadian Dam Association Bulletin - Fall 2016 - Young Professional Activities
Canadian Dam Association Bulletin - Fall 2016 - Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Fall 2016 - 46
Canadian Dam Association Bulletin - Fall 2016 - cover3
Canadian Dam Association Bulletin - Fall 2016 - cover4
Canadian Dam Association Bulletin - Fall 2016 - outsert1
Canadian Dam Association Bulletin - Fall 2016 - outsert2
Canadian Dam Association Bulletin - Fall 2016 - outsert3
Canadian Dam Association Bulletin - Fall 2016 - outsert4
https://www.nxtbook.com/naylor/CDAQ/CDAQ0119
https://www.nxtbook.com/naylor/CDAQ/CDAQ0418
https://www.nxtbook.com/naylor/CDAQ/CDAQ0318
https://www.nxtbook.com/naylor/CDAQ/CDAQ0218
https://www.nxtbook.com/naylor/CDAQ/CDAQ0118
https://www.nxtbook.com/naylor/CDAQ/CDAQ0417
https://www.nxtbook.com/naylor/CDAQ/CDAQ0317
https://www.nxtbook.com/naylor/CDAQ/CDAQ0217
https://www.nxtbook.com/naylor/CDAQ/CDAQ0117
https://www.nxtbook.com/naylor/CDAQ/CDAQ0416
https://www.nxtbook.com/naylor/CDAQ/CDAQ0316
https://www.nxtbook.com/naylor/CDAQ/CDAQ0216
https://www.nxtbook.com/naylor/CDAQ/CDAQ0116
https://www.nxtbook.com/naylor/CDAQ/CDAQ0415
https://www.nxtbook.com/naylor/CDAQ/CDAQ0315
https://www.nxtbook.com/naylor/CDAQ/CDAQ0215
https://www.nxtbook.com/naylor/CDAQ/CDAQ0115
https://www.nxtbookmedia.com