Seasonal variations in the physico-chemical characteristics studied in the estuary showed significant changes. The surface water temperature (°C) was found to vary from 35.07±2.54 to 21.54±0.12, rainfall (mm) from 236.93±168.91 to 9.66±16.74, salinity (PSU) from 35.22±0.14 to 7.47±2.63, pH from 8.30±0.03 to 6.86±0.15, dissolved oxygen (DO-ml/l) from 6.18±0.02 to 0.92±0.06 and petroleum hydrocarbon (PHC µg/l) from 14±1.63 to 1.4±0.37. Temperature, salinity and pH decreased during monsoon season. Rainfall, DO and PHC levels were higher during this season. The water quality in this estuary was found to have been impaired due to anthropogenic activities.
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