Changes in water quality following renovation of a water supply reservoir

摘要

Water quality in lakes is determined in part by phyto-plankton biomass. Lakes with high phytoplankton biomass have poor water quality and increased costs for drinking water purification (Cooke Kennedy 2001). Lakes with high phytoplankton biomass can be dominated by blue-green algae (Canfield et al. 1989, Downing et al. 2001) that impart a foul taste and odor to drinking water and can pose a health risk to humans (Cooke Kennedy 2001, Cox et al. 2005). Phytoplankton biomass in lakes is correlated with the concentration of phosphorus in the water column, but nitrogen also plays a role when phosphorus levels are high (McCauley et al. 1989). Sources of phosphorus to lakes include external loading from the watershed and internal loading from the sediments (Cooke Kennedy 2001).