MORPHOMETRIC PARAMETERS OF MICRO WATERSHED IN PARAVANAR SUB-BASIN, CUDDALORE DISTRICT

Morphometric parameters of micro watershed of Paravanar sub-basin is extracted from digital elevation data using D8 algorithm available within r.watershed module in GRASS GIS and Quantum GIS environment. The basis for assuming the limiting threshold value is discussed by using ASTER data and the results are computed. The number of micro-watersheds resulting for limiting threshold value is obtained and presented. r.water.outlet module was used to obtain a watershed basin with a set of coordinates representing the outlet point of watershed. Subsequently r.basin module was used to determined the linear, areal and relief aspects of the micro watershed. The total area of micro watershed is 100Km2 with the main channel extend of about 21Km. The Bifurcation Ratio is about 3.2 and the maximum order based on Strahler method is about 4 with 37 total numbers of streams.