Study of monthly variations in selected physico-chemical parameters for evaluation of water quality of Manika Mann (Lake), Muzaffarpur, Bihar.

Manika Mann is a perennial source of water for the locals. To evaluate the water quality of the above Mann, selected physico-chemical parameters were studied in each month of the year that is from January to December. Here the temperature ranged between 10.50C to 31.80C, pH ranged between 6.68 to 8.36, Transparency 18.80 cm to 46.54 cm, Total Dissolved Solids 398 mg/l to 2165 mg/l, Conductivity 142.25 µs/cm to 246.24µs/cm. Dissolved Oxygen from 4.2 to 10.6 mg/l. Free Carbon Dioxide 4.50 mg/l to 7.26 mg/l, Alkalinity 139.62 mg/l to 166.35 mg/l, Hardness 78.54 mg/l to 154.54 mg/l, Carbonate 32.72 mg/l to 69.62 mg/l, and Bicarbonate 147.60 mg/l to 276.24 mg/l respectively. Therefore, on the basis of above findings it is essential that Mann water should be put under strict vigilance and constant monitoring, so that quality of water may be managed and cause of its deterioration be checked.