Lake water quality degradation has been apparent for decades, especially in those lakes situated in the vicinity of cities which have anthropogenic activities. The present investigation was carried out for determining the various physico-chemical and biological characteristics of surface water quality of various lakes at Coimbatore, India. The sampling points were selected on the basis of their importance. Six sampling locations namely at Perur Lake (L 1 ), Selvachinthamani Lake (L 2 ), Ukkadam Lake (L 3 ), Kurichi Lake (L 4 ), Valankulam Lake (L 5 ), and Singanallur Lake (L 6 ) were selected and water samples were collected mostly from open wells in and around Coimbatore district. The physico-chemical parameters like Dissolved oxygen, Faecal coliforms, pH, Electrical conductivity, Biochemical oxygen demand, Chemical oxygen demand, Turbidity, Total dissolved solids, Sulphate, Nitrate, Phosphate, Chlorides and Alkalinity were analyzed. The results suggested that, the lake water samples collected from various sites in and around Coimbatore citywere above the limits of WHO standards.

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Kalingarayan canal is one of the historically important irrigation water sources in Erode District. Recently the water in the channel being polluted by letting out untreated tannery and textile effluents. It has been decided, therefore, to carryout a study on the quality of water and its pollutional load. The quality of water is determined by examining physicochemical and biological characteristics. In order to present a simple and comprehensive Water Quality Index (WQI) that could be understood by nontechnical experts and common man, the standard NSF method has been adopted. An alternative WQI omitting Temperature, BOD and phosphates has been evaluated and the correlation between NSF index and this new index has been good. The study revealed that the channel water is highly polluted and could be used for irrigation only.

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The present investigation is an extensive study of surface and ground water quality of Madathukulam taluk, Tiruppur District, Tamil Nadu, India, to estimate the quality of water using Modified Water Quality Index (MWQI) and Geographic Information System (GIS) technique. In this study 35 water samples from Open well, Bore well, River, Lake and Pond were analysed for the physicochemical parameters like pH, temperature, total phosphate, total nitrate, turbidity, total dissolved solids, dissolved oxygen, biological oxygen demand, faecal coliform, electrical conductivity, total hardness, chloride, fluoride, sodium and potassium. The resulting values were computed to investigate the quality of water using geographic information system and water quality index and compared with the standard drinking water guidelines proposed by the WHO (2017) and BIS (2012) for drinking and agricultural purpose. Inverse distance weighted (IDW) interpolation technique was used for preparing the spatial distribution maps for each physiochemical parameter. The analytical result signifies that 40% of the study areas are slightly acidic. GIS based water quality index shows that 63% of the area has recorded with good quality water, while the remaining 37% are of medium quality of water. The MWQI proved to be a useful method to classify the water similar to NSF-WQI in Madathukulam Taluk.