Visual clarity in rivers
Visual clarity refers to how far you can see through the water. It provides an indication of the levels of suspended sediment (ie, fine soil particles which remain in the water for a considerable period of time without contact with the bottom). High water clarity indicates low levels of suspended sediment.
Rivers and lakes with high clarity appear clean and are often highly valued for fishing and other recreation. A river or lake with low clarity will have murky water, which may indicate significant erosion in the catchment (producing suspended sediment) or abundant algal growth in the water. Murky water prevents sunlight penetrating, while sediment can smother aquatic habitats which affects the feeding and spawning habits of fish and other animals, and the growth rates of plants.
Return to the main river water quality page
Last updated: 5 July 2010
