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Problem
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Lake Winnipeg storm events displaced existing rip-rap and left the shoreline unprotected. Serious erosion resulted, threatening private property-owners’ homes and land.
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Project background
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Rip rap was installed many years ago and after decades of storm activity, has become displaced and ineffective. A dike was also constructed to help protect the shoreline from erosion, but it too has failed to solve the problems.
With permission from a property owner at an especially vulnerable site on the lakeshore, Agrecol, in cooperation with Earth & Road of Wisconsin and Mid-Canada Hydroseeding, Manitoba, Canada, undertook a demonstration project to stabilize a section of the shoreline.
Agrecol and its partners worked with the Lake Winnipeg Municipal Planning District to review all the technical aspects of the project for approval to proceed.
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Solution
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An Envirolok Vegetated Retaining Wall was installed based on a storm plain plan. The slope was first decreased (flattened), and a toe (foundation) was placed at water’s edge. Then a standard Envirolok wall was installed, which included Envirolok bags, bag stabilizing weaving material and broadcast seeding of native seed, plants and willows over a 4-6 inch layer of topsoil.
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Permits - Engineering
Site Construction Supervision
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Provided by Agrecol Corporation, Earth & Road and Mid-Canada Hydroseeding.
Permitting required sending shoreline development permit application, survey of property including property boundaries and average high water level, conceptual engineering drawings, site photos with overlay of key trench area, written description of project, material to be used, type of equipment to be used, date of construction and other details along with a general letter indicating request for protection, type of protection requested, information regarding existing protection.
A complete shoreline erosion technical committee checklist was completed and submitted to the Municipal Planning District, to the Shoreline Erosion Technical Committee and to the Department of Fisheries and Oceans for their review and approval.
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Environmental Review and Follow-up
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All parties involved in the project are very pleased with the results to date. Erosion is controlled, the property-owner’s structure is no longer threatened and vegetation is strong and healthy. The system will become stronger with time.
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 LakeWinnipeg.pdf
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