摘要：The Dalvoy lake of Mysore is fed mostly by storm water drainage from a major part ofthe city. It is exposed to the influence of heavy urbanization and industrialization. Thelake water is primarily used for agricultural practices seen over the southeastern sideof the lake at downstream end. Due to several reasons, the water quality is deteriorating.In order to evaluate the potability and assessment of water quality for different purposes,all important physicochemical and biological parameters were detected by collectingsamples from the surface and also from depths ranging from 4 to 12 feet. The wateranalysis data were processed to determine the water quality index by NSF method.For each of WQI a descriptive quality indicator has been derived as very poor (0-38),poor (39-71), good (72-83), very good (84-89) and excellent (90-100) categories. Surfacewater quality, mainly used for drinking water abstraction, has been represented on thelake network map. In this paper the water quality indicators were calculated for alllocations and also classified with reference to seasons. It was observed that the WQIof the Dalvoy lake is not good and the main cause of deterioration is due to the lack ofproper sanitation, untreated inflow water with municipal sewage and due to uncontrolledanthropogenic activities.
