ASSESSMENT OF WATER QUALITY INDEX: A CASE STUDY OF JAL MAHAL LAKE AT JAIPUR RAJASTHAN, INDIAManish Kumar Jain and Yuvraj SinghAbstract Mansagar (Jalmahal lake) is spread over in about 130 ha with a maximum depth (>7m) at the dams outflow point is a man-made lake polluted with municipal and industrial sewage since 1962 through 2 main wastewater drains namely Brahampuri and Nagtalai. Water-hyacinth infestation in 1975 suppressed algal growth whereas addition of its organic produce catalyzed water quality deterioration. This lake suffered maximum when unprecedented down pour for 2 days in August 1981 deposited enormous amount of sand and silt through wastewater drains. The water quality index has been determined at various stations along edge and across the width of Jalmahalin 2015-2016. By conclusions it has been found that Jalmahal Lake water is acceptable to slightly polluted.
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