17.5.2  Lakes

The effect of pollution on lakes differs in several respects from the effect on rivers. Water movement in lakes is slower than in rivers so re-aeration is slower. The reduction in flow rate as a stream enters a lake also causes sediments to settle out of the water and slowly accumulate on the bottom of the lake. Some pollutants are bound to the solid particles and will therefore also accumulate in the sediment.

17.5  Effects of pollution on water sources

17.5.3  Groundwater