m to 0.610 m at neap tides. The change in water levels combined due to astronomical tide, wind setup, wave setup, barometric pressure, seiches and global sea level rise are estimated as 1.57 m, 1.68 m and 1.8 m at 15 m, 10 m and 5 m depth contours, respectively. Waves ranging from 0.4 m to 2.0 m in the deep water around Chennai harbour have been experienced with the predominant being 0.4 m to 1.2 m with wave periods predominantly in the order of 4 to 10 seconds. During cyclone season, waves of height exceeding 2.5 m are common. The predominant wave directions during southwest and northeast monsoons are 145° from north and 65° from north, respectively. The most prevailing winds in the region are the southwesterly between April and October and the northeasterly during the rest of the year. The predominant wind direction is mostly from W and SW direction during the rainy season and SW and NW during post-monsoon month. However, during January to March, winds from NE and E direction are predominant. During the northeast monsoon, that is, between October and January, the direction of wind is generally NE and NNE. During depressions in northeast monsoon, the wind velocity goes up to 50 km/h and up to 105 km/h during cyclones of duration 2 to 3 days. Gusts of 160 km/h have been occasionally experienced. During southwest monsoon between March and September, the wind blows predominantly from the south. During June, July and August, strong wind is experienced from southwest direction in mornings, from south during afternoons, and from southeast during nights. Wind direction is between 153° and 263° relative to the north, and the wind speed varies from 2 to 12 m/s. Situated on a coast that constitutes chiefly of sandy shelving breaker-swept beaches, the region surrounding the port falls under Seismic Zone III indicating a moderate risk of earthquake. The port was developed into the sea by reclaiming land as there is no sheltered harbour. The depth of the draft is up to 17 m, and the soil in the entrance channel is predominantly sandy and silt. The port is bordered by the Cooum delta in the south and Royapuram fishing harbour in the north. Visibility in the harbour region is good throughout the year and low visibility is commonly associated with heavy rains during the northeast monsoon. Historically, the port was responsible for