Web Analytics Made Easy - Statcounter
Preserving the health and beauty of our lake
Loon Enviro Lac Gauvreau
Logo for Enviro Lac Gauvreau

Enviro Lac Gauvreau

Our Lake Environment - Get answers here!

A- A A+
Frequently asked questions

What's a drainage basin?

It's a defined geographic area from which all water drains towards a common point. In our case, Gauvreau lake has a drainage basin surface area of almost 49Km2 which is mostly located Northwest of the lake. Human activities (such as agriculture or industry) that take place on a given drainage basin have a proportional and direct impact on the outflow. A major part of Gauvreau lake basin is occupied by cattle farms.

Why are phosphorus and nitrogen levels in water so important?

Gardeners know it, manure is an excellent fertilizer. This property stems from its high content in phosphorus and nitrogen. Therefore, when these two elements are found in high concentrations in a lake, they stimulate algae and aquatic plants growth. Measuring phosphorus and nitrogen levels becomes important to gain increasing knowledge of their origins and the effects they have on a lake and to elaborate control strategies.

Why do we need to protect the shorelines?

The shoreline is the area where the surface of a water body meets land (or rocks). In other words, it's some sort of a frontier. On one side, it prevents the lake from eroding the land and on the other, it filters surface and groundwater before it reaches the lake. It is therefore essential that this frontier be stable and maintained and the best way to do so is to let vegetation grow on the shoreline. Plants and trees are performing two duties; their roots stabilize the shoreline against erosion and also intercept nutrients (phosphorus, nitrogen) that would otherwise reach the lake and feed the overgrowth of aquatic plants and algae.

Why is it so important to maintain an optimum working septic system?

Residences that do not have access to a municipal sewer system must have their waste water treated by a septic system. The majority of septic systems work on a two-stage approach. The first phase allows particles heavier than water to drop at the bottom of a tank. Only then does the water flows towards the septic field, several feet underground, where it is evenly distributed to seep into the ground.

However, this water is still heavily contaminated with chemicals and microorganisms such as fecal coliform bacteria, phosphorus and nitrogen. Waste water treated by a properly functioning septic system, that is adequately maintained and far enough from a water body, will have no effect on the environment. The opposite can have serious consequences on the water quality of a lake. Phosphorus and nitrogen will stimulate plant and algae growth and, eventually, cyanobacterial blooms. Fecal coliform above a certain concentration poses a health risk and compromises recreational activities in the lake.

Why is there a windmill on the eastern shore of the lake?

Oxygen is as essential to a lake as it is to human beings. It allows for a variety of fish species to thrive and for organic matter to decompose. Declining populations of fish accompanied by an anarchic plants and algae growth often signal that dissolved oxygen levels are too low in a lake. A variety of devices allow for the artificial injection of dissolved oxygen underwater; one of those is the windmill. Basically, the wind activates a mechanism that injects tiny air bubbles underwater. In other cases, the mechanism activates an underwater propeller which mixes water. This ''mixing'' allows for the deep layers of water to come to the surface and get oxygenated.
General Resource Links
Municipalité de La Pêche
Ministère du Développement Durable, Environnement et Parcs du Québec/ Sustainable Development, Environment and Parks Quebec
Critères de qualité de l’eau de surface au Québec/ Surface water quality criteria in Quebec
Environnement Canada/ Environment Canada
Fondation de la Faune du Québec
MRC Regulation on Shoreline protection/Protection de La Bande Riveraine 

WaterCan / EauVive

International Decade for Action - Water for Life / Décennie internationale d'action - L'eau, source de vie

Canadian Water Network / Réseau Canadien de L'Eau

Water Quality