To draw reliable conclusions and establish trends, it is important to measure several parameters, such as the following:

• Water transparency: the ability of water to transmit light, also referred to as turbidity. High transparency indicates clear water.

• Total phosphorus: an essential nutrient for living organisms, often limiting in aquatic environments. The addition of this nutrient to a water body can have significant environmental consequences, notably by promoting excessive growth of aquatic plants and contributing to eutrophication.

• Nitrites and nitrates: nitrogen, found in nitrites and nitrates, is an essential nutrient for plants and algae. It occurs naturally in the environment, but anthropogenic inputs, such as agricultural fertilizers, increase nitrogen concentrations and promote eutrophication.

• Chlorophyll a: chlorophyll is a green pigment found in photosynthetic organisms such as phytoplankton. It exists in different forms, including chlorophyll a, the common pigment in most algae. Therefore, chlorophyll a concentration is a good indicator of phytoplankton biomass and is often associated with phosphorus concentration.

  Dissolved organic carbon: it comes from the decomposition of living organisms. Its concentration allows the assessment of substances responsible for water coloration. An increase in dissolved organic carbon leads to a decrease in water transparency.

• pH: to support aquatic life, pH should be between 6.5 and 9. Many biogeochemical processes are strongly influenced by significant pH variations.