(Granby) The City of Granby will faucarder invasive plants in Lake Boivin. The municipal government this week received approval from the Ministry of Environment to conduct such intervention.
The weed cutting operations will be conducted this fall on 10.8% of the lake area, or when aquatic life is less active, said Mayor Pascal Bonin. Plants, and filamentous algae will faucardées 30 cm from the surface of the water. The section referred is on the north side of the lake, between rue Quévillon and the floating dock near the McDonald’s.
“It’s an area where we have many citizens who engage in tourist activities. People fish, make canoe and kayak. This is where we wanted to start, “he said in an interview Friday.
To do the work, the City will acquire a boat specially designed to cut seaweed and pick up as you go. A tender is being prepared to request proposals from manufacturers such craft, said Mr. Bonin. “We have looked if we could rent a boat, but it is very complicated and frankly, we do not save much. It is better to buy one that is going to use. ”
Give a chance to the lake
Of weed cutting operations are also planned for the spring and fall 2017, said the mayor. Analyses will be performed to determine how the ecosystem will respond to Operations, he said.
“By removing all this mass of plants, we think it will give a chance to the lake. But we have to see how it will affect the lake. Is algae grow back? Do they regenerate? Does the concentration of phosphorus in the water will be reduced? All that will be analyzed. ”
Before faucardage in 2017, the City will however obtain the consent of the Ministry of Environment, recognized the mayor. Applications for Certificates of Approval will be sent well in advance, has he said.
The federal government is also concerned with the weed cutting into Lake Boivin. The fact that a motor boat will be used for the job says Ottawa has a say. The Member for Shefford to the House of Commons, Pierre Breton, pleaded the cause of the City to the authorities, said Mr. Bonin.
Communications officers at Federal Department of Transportation has not called us on Friday.
Boat and conveyor
Buying a boat specially designed for faucarder aquatic plant costs about $ 250,000, according to estimates of the mayor. Mr. Bonin discussed last fall with a representative of the Ontario company that manufactures Aquamarine aquatic weed harvester type boats. The price includes a conveyor which picks up the plants as and when they are cut and a barge.
The weed cutting is part of a plan adopted last year by the board to improve the health of Lake Boivin experiencing episodes of cyanobacteria and invasive algae. A series of measures are proposed to reduce phosphorus levels in the lake. It is thus expected to develop filtering marshes, retention ponds and ditches to capture phosphorus and sediment. An amount of 2.2 to 2.6 million could be invested in the next 15 years.
A crapshoot successful
This is a council of political victory. Elected had indeed decided in the spring to accept that a study on the origin and amount of phosphorus flowing into the lake Boivin is carried out, but as long as the Ministry of the Environment agrees that the City begins work of weed cutting.
Usually, the Ministry does not accede to such requests, favoring the accumulation of scientific data before allowing direct intervention in a watercourse.
The throw of the dice worked, supported the mayor Pascal Bonin. Good player, he still thanked provincial officials for their opening. “They trust us and we must thank them for that,” he said.
Mr. Bonin is convinced that a dual approach, ie to proceed to faucardage while continuing to study the watershed of Lake Boivin, convince people of the seriousness of the approach. “If people are not able to see that there are actions on the ground to ask, they will win, they no longer believe that it is possible to improve our lake. They want to move. ”
The study will target the North Yamaska River and streams Bouchard and Ostiguy, will be conducted in conjunction with the Yamaska watershed organization, the Institute for Research and Development and the Agri-Environment Gestrie-Sol club advisor. The City is committed to unblock $ 72,219 for the study while IRDA will inject $ 31,925.