Drainage Morphometry Evaluation for Kodavanar sub basin to Understand the Interrelationships in Morphological Systems and in Process-Response Systems

The utility of the drainage geomorphometric characteristics for the investigations relating to geomorphology and hydrology has been amply demonstrated by a number of studies to conducted various geospatial technology. The present study area is Dindigul district and its suburbs have been frequented by heavy rains during the monsoon seasons. The river Kodavanar which is frequently in spate during the monsoon seasons and flows through the western part of the Dindigul and its suburbs has a large catchment area, extending to the neighbouring Karur and Madurai Districts on the north east. The aim is to assess the morphometric characteristics of the Kodavanar sub basin of Amaravathy basin of Tamil Nadu. The objectives is to accomplish the aim are: to analyse the linear, areal and relief aspects and to bring out the form and processes of the study area. In order to understand the drainage characteristics in various parts of the Kodavanar sub basin, the basin has been divided into 5 watersheds namely, Kodavanar-Umiyar, Anaiviludan Odai, Pudukulam kombaiar, Todikombu and Periyakombai watersheds. Strahler's method of stream ordering which is the most commonly used method of stream ordering has been followed for the present study. For all the 5 watersheds separately, the linear, and areal and relief aspects have been discussed. The linear aspects considered for the study include stream order, stream number, stream length, bifurcation ratio and length ratio. The areal aspects include basin area, form factor, circulatory ratio, elongation ratio, drainage density, stream frequency, length of overland flow and the relief aspects considered for the present study are basin relief and ruggedness number.