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The present research work has been carried out to estimate the various Physico – chemical (hydrology)
of the Ulhas river estuary along the Vasai coastal area of the Thane district. The hydrological studies
were carried out at two stations viz. Bhayander and Naigaon jetty on monthly basis from June 2008 to
May 2009. The present research study reveals that parameters like Temperature, Salinity, Conductivity,
Total Hardness, Phosphate, Nitrates and Sulphates are in high concentration during the premonsoon
period at both the stations. Turbidity and Total Suspended Solids has been found to be in higher
concentration at both the station during the Monsoon period. Silicates concentration is found to be
relatively high during the Monsoon period which may indicate presence of dinoflagellates. Presence of
extremely high concentration of Phosphate and Nitrates is peculiarity of both the stations, may be due to
release of high amount of untreated sewage. This study reveals that the water of Ulhas river estuary is
proceeding towards deteriorating condition and the main causes may be release of industrial effluents,
solid waste dumping, reclamation, construction activity and sand dredging.
Keywords: Salinity, COD, BOD, Turbidity, Sulphate, Vasai Coastal Area.