Water is very vital source for all living beings, without water there is no life possible on the earth. But its mismanagement creates havoc problems such as catastrophic flood and drought. Scarcity of water created drought in many part of world and excess of water created flood. In this study an attempt was made to find out the reason behind the catastrophic flood of Tamilnadu that creates havoc problem in the month of October, November and December 2015. Tropical Rainfall Measuring Mission (TRMM) daily, monthly and annual rainfall data were used to study the average precipitation, its climatology and pattern. This study has been performed to determine the extent of severity in the flood affected districts of Tamil Nadu much as Chennai and other surroundng region. In this article we have also studied the impact of flood in terms of property dammage and life loss that happens in large scale.