Chennai Basin

The Chennai basin group rivers are situated between latitudes 12 ^o 30’ 00’’ to 13 ^o 35’00’’ N and longitudes 79 ^o 15’00’’ to 80 ^o 22’30’’E and is located into the northern part of Tamil Nadu. The Chennai Basin Group of rivers is Araniar, Korattalaiyar or Kosasthalaiyar, Cooum and Adyar and small minor stream on the southern part of the basin. The northern part of Chennai basin is occupied by Andhra Pradesh and Pulicat lake, south and west by the Palar river basin and east by Bay of Bengal. The total geographical area of Chennai basin within Tamil Nadu is 6118.34 sq km totally.

The Chennai Basin consists of 8 Sub-Basins and their areal extent are as follows

Hydrological Variables

Base Period (1985-2014)                     Near Century (2021-2050)

Climate Risk

Base Period (1985-2014)                     Near Century (2021-2050)