The present study was undertaken to know the variation in a different season in response to physico-chemical properties and Water Quality Index of Ram-Ganga reservoir at Kalagarh in district Pauri Garhwal. The study was carried out over a period of one year from August 2015 to September 2016 from six sampling zone. In India, there is an enormous number of natural and man-made water bodies used for various purposes like irrigation, hydropower generation, etc. Physico-chemical parameters were monitored for the calculation of Water Quality Index for the monsoon, winter and summer season. For WQI using nine parameters are (pH, Total Dissolved Solid, DO, BOD, Total Hardness, Calcium, Magnesium, Total Alkalinity, and Chloride) selected. This study was observed that the water quality was found to be very poor water quality in monsoon and summer season to unsuitable for human consumption due to heavy rainfall in monsoon season, turbulent flow, soil erosion and other activities.
