Hydrographic, tidal and rainfall observations at a selected station situated near the mouth of Korapuzha esluary during the period 1989-1993 revealed that the main causative factor which brings in variations in salinity is rainfall and the associated river runoff rather than the tide eventhough the estuary is connected with the Arabian sea throughout the year permitting a free flow of sea water into the estuary and a counterflow of freh water in the opposite direction.

Salinity, rainfall tide, Karapuzha