Canadian Dam Association Bulletin - Fall 2016 - 19

POTENTIAL DAM LOCATIONS Six (6) potential replacement dam locations were initially identified; one (1) upstream of the existing dam and five (5) in Lake Major. All locations were within 1,000 metres of the existing dam. Location A was initially favored as a potential upstream location because of the advantages of a peninsula and savings in materials. A borehole geotechnical investigation in March 2016 identified the foundation as pervious material with deep bedrock that would require an innovative, and potentially expensive, foundation design. A supplemental borehole investigation identified Location B and C as having more favorable foundation conditions and similar upstream benefits. An upstream dam will allow Halifax Water to increase storage at Lake Major, possibly even to a level that will allow multi-year storage. Simulations of the reservoir indicated that a normal operating water level at approximate elevation 21.5m will allow Halifax Water to develop operating rules that will allow it to manage the reservoir such that it can store nearly all inflow without unplanned spill events. At location C, the conceptual replacement dam centreline will be orthogonal to the major axis of Lake Major. The location will cause significant interruption to the existing environment with unwatering of the reach between the existing dam and Location C. The resulting previously submerged lakebed will need to be re-vegetated and new/old streams reinstated. Current lakefront homes will no longer have lake frontage, except for the reinstated stream. At the dam, discharge structures include an overflow spillway and fish ladder. A low level sluice is added to provide additional operation control and a means to lower the reservoir for maintenance work. At Location F, the replacement structure consists of a low overflow dam that can meet current demand, but that may require a new dam upstream to meet future demand. Canadian Dam Association * Fall 2016 Three concepts are developed, two of which allow for additional growth before an upstream dam is required. The location provides for minimal interruption to the existing environment. Riparian flow requirements can be achieved with conventional discharge structures, which include an overflow spillway and fish ladder, as well as the culvert near the intersection of Old German Road. A low level sluice is added to provide additional operation control and a means 814180_Sorensen.indd 1 to lower the reservoir for maintenance work, but otherwise the structure can behave according to historical patterns. SOCIAL AND ENVIRONMENTAL FACTORS Constructing a replacement dam upstream of the existing dam will require decommissioning of the existing dam, rehabilitation of previously inundated land and construction of a cofferdam. The rehabilitation will 25/05/16 19 7:30 PM http://www.sorensensystems.com http://www.sorensensystems.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
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