- Val-des-Monts integrated water management project (PHASE 2)
- Bathymetric mapping of Val-des-Monts lakes
- Detection and mapping Eurasian Watermilfoil area
- Biological health monitoring
The Federation of Lakes of Val-des-Monts has put forward its most ambitious project for the protection and improvement of the water quality of lakes in the territory of Val-des-Monts. The Val-des-Monts Integrated Water Management Project by Watershed (PGLVDM) is a study of all accessible and inhabited lakes in the watershed territory of the Blanche Ouest river in Val-des -Mount as well as several lakes forming part of the catchment area of the Lièvre river.
Several factors prompted the Federation to take the lead in using the strategy of integrated water management by watershed. First, it was desirable to set up a project that could benefit all of the lakes in the Val-des-Monts territory. In addition, it was deemed necessary to have a project that would touch on all of the issues related to the water resource, such as pollution, premature eutrophication of lakes, blue algae, reforestation of the banks, the presence invasive species introduced, beaver management, species at risk, recreotourism activities, agriculture, sewage in isolated residences, etc.
It is also with a view to offering support and assistance to all water users and especially the next generations that the Federation joins forces in such a project.
VAL-DES-MONTS LAKES PHYSICOCHEMICAL MONITORING REPORTS
The Federation of Lakes of Val-des-Monts continues physico-chemical monitoring of several lakes throughout the territory of Val-des-Monts. This type of monitoring is an important part of any watercourse monitoring program. Indeed, this allows to see the evolution or the dynamics of the lakes in terms of improvement or degradation of aquatic environments.
However, it has a limit, that is, that it represents the situation in the watercourse only at the precise moment when the analysis is carried out. Therefore, it is important to take these steps at different times during the same season and from year to year.
This type of monitoring allows you to:
- Identify problems affecting watercourses.
- Compare the results obtained with the quality criteria, which are standards established by the competent authorities. These criteria establish the lower and upper limits that the parameters should not exceed to guarantee the uses of water as well as the protection of aquatic life.
The Federation uses a multi-parameter probe (YSI Professional Plus) to measure 4 physico-chemical parameters, namely temperature (° C), dissolved oxygen concentration (mg / l), pH and conductivity (µS / cm) over l 'entire water column (represents the volume of water between the surface and the bottom of the lake).
This monitoring is carried out at the deepest location of the lake.
Why measure every meter? Thanks to this probe fitted with a cable up to 30 m deep, it is possible to measure the variability of the parameters in order to create physicochemical profiles. It is then possible to compare the values obtained with the recognized water quality criteria.
The thermal stratification of a lake is defined as the formation of distinct layers of water superimposed on each other (epilimnion, metalimnion and hypolimnion).
The formation of these layers is due to a temperature difference between the layers, which results in a difference in the density of the water. This difference also influences the other physicochemical parameters, including the dissolved oxygen level.
BLANCHE-OUEST RIVER WATERSHED (in french)
LIEVRE RIVER WATERSHED (in french)
In order to respond to a general lack of data throughout the territory, the Federation of Lakes of Val-des-Monts has undertaken the project of mapping the lakes. It thus acquired a SonarGPS allowing it to measure the depths and the relief of the bottoms of the various lakes. The principle is to cover the entire lake aboard a canoe, zigzagging and constantly maintaining a low speed. The depth data are recorded and the cartography is produced using software.
For example, these maps will allow safer navigation and will allow the visualization of the shallow areas where the milfoil meadows can be established.
BLANCHE-OUEST RIVER WATERSHED
LIEVRE RIVER WATERSHED
Average depth : 19,1 m Maximum depth : 52,6 m
Eurasian watermilfoil is now present in several lakes in the Val-des-Monts territory. In fact, the Federation of Lakes of Val-des-Monts has located Eurasian milfoil meadows during monitoring undertaken between 2012 and 2015.
- Baie Mud - Observation 2015
- Lac Bonin - Observation 2015
- Lac Brassard - Observation 2012
- Lac Dame - Observation 2014
- Lac Grand - Observation 2014
- Lac McArthur - Observation 2012
- Lac McGregor - Observation 2012
- Lac McMullin - Observation 2013
- Lac Saint-Pierre - Observation 2013
- Lac Twin - Observation 2015
- Lac Vert - Observation 2014
* This list is not exhaustive and needs to be revised and improved.
The Federation is currently carrying out rigorous monitoring with the aim of detecting and mapping the milfoil meadows present in the lakes of Val-des-Monts.
The monitoring of biological health, known as biological integrity, was carried out on several streams distributed throughout the territory of the Municipality of Val-des-Monts.
This integrity is defined as the ability of an ecosystem to support and maintain a balanced, integrated community capable of adapting to change.
Biological monitoring has proven to be an important tool for assessing the biological health of aquatic environments. In fact, this type of monitoring is useful for: assessing the overall health of aquatic ecosystems; monitor the evolution of the overall health of a watercourse over time; assess and verify certain sources of pollution; assess the effect of restoration measures; complement the water quality monitoring program.
The biological health index has a value between 0 and 100. It is possible to classify the sampling site in one of the following categories:
Biological health index value
Slightly degraded site
Rather degraded site
- Temperature: influences organisms and other physico-chemical parameters of water.
- pH: determines whether the water is more acidic, neutral or basic.
- Dissolved oxygen: corresponds to the amount of oxygen that is found naturally in water.
- Turbidity: measures the quantity of suspended matter in the water.
- Hardness: measures the concentration of water in mineral salts, including calcium and magnesium.
The description of the site makes it possible to contextualize the physicochemical data in addition to explaining the presence or absence of certain macroinvertebrates.
In 2020, the habitat quality index (HQI) was added to the monitoring. The objectives are to determine whether the watercourse optimally supports aquatic life, to characterize the habitat degradation.
The methodology presented is applicable in watercourses with a regular and shallow flow, ie rivers that can be crossed on foot. The consultant therefore selected streams that meet this criterion in addition to being easily accessible and representative sampling sites for the entire territory of Val-des-Monts.
The sampling procedure to be followed for carrying out biological monitoring studies includes the following steps:
- Site description / Habitat assessment.
- Assessment of water quality by different physicochemical parameters.
- Assessment of the habitat quality index
- Sampling of benthic macroinvertebrates (MIB).
- Sorting of the sampling and identification of the MIBs using a recognized identification key.
- Analysis of data and assessment of biological integrity.
During the summer of 2019, the Federation of Lakes of Val-des-Monts carried out biological surveillance monitoring of 13 sampling sites spread over the entire territory of Val-des-Monts, and in proportion to the two watersheds, that of the Blanche-Ouest river and that of the Lièvre river.
The full report, Biological Health Tracking - 2019 Edition, can be found HERE (IN FRENCH)
In 2020, The Federation carried out biological surveillance monitoring of 10 sampling sites .
All the reports can be found here (IN FRENCH):