Assessment of Physicochemical Parameters of Hanumanthapura Lake, Tumakuru District, Karnataka, India

Lakes are the most important freshwater ecosystems for agricultural, domestic and ecological purpose. They are important suppliers of drinking water, irrigation, fisheries and the preservation of biodiversity. Ecological health and the potability of freshwater are affected by water quality, which is evaluated based on various physicochemical parameters and the concentration of nutrients. However, degradation of this important natural resource due to increasing anthropogenic pressures including agriculture runoff and domestic waste. The present study examines the physicochemical parameters of Hanumanthapura Lake from Dec- 2023 to Nov-2024 at five different sites of the Lake. Temperature, pH, EC, Turbidity, Total alkalinity, DO, Calcium hardness, Magnesium hardness Total hardness, BOD, Free carbon di- oxide, Phosphate, Chloride and TDS parameters were estimated in the laboratory using standard methods of Trivedi and Goel (1986) and APHA (2005). The result revealed that, atmospheric temperature ranged from 25.63–26.34°C, water temperature from 24.08–25.00 °C and the pH ranges from 7.84–8.05. DO values varied from 2.87–3.41 mg/L, while, BOD level fluctuated between 19.59–23.68 mg/L. However, total alkalinity content of the water deviated from 160.10-186.08 mg/L and TDS ranges from 391.92–625.00 mg/L, magnesium deviated from 29.63–36.32 mg/L. Physicochemical parameters like Turbidity, BOD, Mg hardness are not significant level compared to BIS (2012). Hanumanthapura lake has been contaminated as a result of ongoing anthropogenic pressure, notably agricultural runoff and untreated domestic sewage from the surrounding area.