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).