GIS techniques have been adopted for the present inves-tigation to identify the drainage morphological features and analyzing their properties. The Kolli hills fall in Namakkal district, Tamil Nadu, India, have been taken up in the present investigation. The drainage morphometric analysis of the study area indicates that the micro-watersheds show dendrit-ic, sub-dendritic and radial drainage pattern. The parameters worked out includes Drainage density, Drainage texture, Bifurcation ratio, Stream order, Stream length, Stream length ratio, Stream frequency, Basin length, Form factor, Elongation ratio and Circulatory ratio. The morphometric analysis suggests that the comparison of all the fourteen mi-cro-watershed shows that the morphometric parameters eva-luated using GIS helped us to understand various terrain parameters such as nature of the bedrock, infiltration capaci-ty and runoff, etc,. In the present scenario where water re-sources are becoming scarce, this exercise of calculating the various attributes of drainages plays a significant role in locating sites for groundwater potential and artificial re-charge structures. However, a comparison of the entire 14 watershed shows that the 2nd, 3rd and 7th micro watersheds have lowest drainage density, and hence are better suited for construction of recharge structures....
Authors: Vinoth.M, Suresh.M, Gurugnanam.B.