translate English to French: The Canadian Water Quality Guidelines for the Protection of Aquatic Life recommend that total suspended solids in an effluent during high flow conditions either n be no more than 25 milligrams per litre above background levels for receiving waters that contain more than 25 milligrams per litre but less than 250 milligrams per litre, or n should not increase the concentrations in receiving waters by more than 10% of background levels when these contain more than 250 milligrams per litre.
Figure 5-1 Terres arables : évolution du risque d’excéder un niveau tolérable d’érosion hydrique entre 1981 et 1996