In this study, LANDSAT TM image of 2012 satellite data along with extensive ground truth information were used. Study about the drainage morphometry and its influence on landform characteristics in Vasishta Nadi of crystalline terrain (Archaean age), Tamil Nadu, South India. Geology and geomorphological landform characteristics of the sub-basin. Morphometric analysis was carried out at micro watershed level using spatial analysis system (ArcGIS ver. 9.3.1) Geographic information system to analyze the influence of drainage morphometry on landforms, drainage and geological characteristics. Four distinct landforms were identified in the basin based on visual interpretation of satellite sensor data. These are Alluvial fan Younger, Dome type Denudational Hills (Large), Dome type Residual Hills , Hilltop Weatered, Inselberg, Intermountain valley/Structural Valley (Large), Linear Ridge/ Dyke, Moderately weathered/moderately buried Pediplain, Pediment/Valley Floor, Ridge type Structural Hills (Large), Shallow Buried Pediment, Shallow Flood Plain, Shallow weathered/shallow buried Pediplain, Upper Piedmont Slope, Valley Fill/ filled-in valley, and water bodies. VasishtaNadi is one of the tributaries of Vellar River, drained in the middle of the sub basin. It is 7th order drainage basin and drainage pattern, mainly in subdendritic to dendritic type. It is observed that the drainage density value is low, which indicates the basin is highly permeable soil and thick vegetative cover. The circularity ratio value reveals that the basin is strongly elongated and highly permeable homogenous geologic formations. The present scenario where water resources are becoming scarce, this exercise of calculating the various attributes of a drainage basin plays a significant role in locating sites for artificial recharge structures.
