Peaking operations, with the variable flow discharge and ramping patterns, the rate and frequency of water level changes, and the amount of time the station is at its maximum discharge level, can all have a significant impact on the degree of channel and bank erosion.
Jeff Graham, P.Eng., President, GSS Engineering Consultants Ltd., prepared this comprehensive table reporting on the cost comparisons between dam repair/rebuild vs. decommissioning. These are actual completed projects, showing the before and after. Check out the table:
The full Capital and Life Cycle Costs of Rebuilding Riverside Dam were not realistically represented in the ESR and could well end up costing the taxpayers more than double what was presented to the public and City Council. A Rebuilt dam would be considered a new dam, not a repair or expansion of an existing weir, with an assessed High Hazard Potential, and is located within the City of Cambridge in a location that could place multiple residences and businesses at risk in the event of severe flooding or a dam breach. ORA and Partners submit that this Project goes far beyond the screening process provided by a Schedule B, Class EA. Consequently, we submit that this is a major project that should fall into a higher level of assessment.
ORA understands the pressure municipalities are under when communities rally to maintain or rebuild their beloved mill ponds. However, it is up to all authorities and municipalities to take a leadership role that places public safety and landscape scale ecological integrity above local individual or group interests.
The East Channel is a stretch of the Eramosa River that runs through the village of Eden Mills, between Rockwood and the city of Guelph. The East Channel was once a pristine river ecosystem; however, for years, it has been in a state of decline. Why? Because a private dam was built without an environmental assessment or permits in the early 1990s, and blocks water from flowing down into the East Channel during the low flow summer months when the river and aquatic life need it the most. Even though there could be as much as 20 inches of water in the river at the entrance of the East Channel, the Upper Dam blocks the flow completely at those times. This dam continues to cause significant and alarming environmental harm to the East Channel’s river ecosystem. Continue reading
In November of 2015, Ontario Rivers Alliance (ORA) commented on EBR 012-5093, regarding a Technical Bulletin for the Alterations, Improvements and Repairs of Existing Dams. You can find our submission on our Blog here. On March 24, 2016, ORA received a Decision Notice, as well as the approved Technical Bulletin. Continue reading
ORA and those listed below are writing in response to the recent settlement of the lawsuit over the Springbank Dam. We request serious consideration of our comments and recommendations regarding the future of the Springbank Dam, and its potential effects on public health and safety, on water quality, climate change, fisheries, and on the natural environment of the Thames River, Lake St Claire and Lake Erie, should it be returned to service.
ORA is very pleased to offer our comments on this EBR posting regarding the administration of Section 16 of the Lakes and Rivers Improvement Act (LRIA). However, to our knowledge, no decision has yet been made on the comments ORA submitted in January of 2014, regarding EBR 012-0562, the Technical Bulletins designed to provide guidance for dam location, operation, maintenance, amendments, reporting and approval under the Lakes and Rivers Improvement Act (LRIA). Effective LRIA guidelines and policies are essential to regulating dams and maintaining healthy rivers.
Keynote Speaker: Mariëtte Pushkar, M.Sc., P.Geo.
Natural Channel Design Initiative
Mariëtte provided an overview of the Natural Channels Initiative, Natural Channel Design Principles, Watercourse Restoration and Dam Removals, and Regulatory Agency Roles and Challenges. She drew on her own experience and that of her colleagues at Ecosystem Recovery during the presentation.
Project Name: Wanapitei Dam Repair
Project Location: Wanapitei Lake, Sudbury District
Contact: J.L. Richard Engineers
Rehabilitation of 98 meter of existing 221 meter long structure. New fish spawning habitat. New elevated access road. Completed. Presented at the Canadian Dam Association Conference.