A Simple and Effective Method for Modelling a Catchment: A Case Study

Abstract

Considering the scarcity of water all over the world and need to estimate the same in an accurate manner, the present work was aimed to find a simple but effective method for estimation of catchment yield for independent catchment and a group of catchments as a whole. In this study, various hydro-meteorological data and catchment characteristics are used as the independent variables of catchment yield. Catchment characteristics data like drainage density, length of catchment, forest area percentage are obtained by the interpretation of aerial photographs by a simple table stereoscope. Hydro-meteorological data like rainfall, temperature and wind velocity data is collected from Tamilnadu Meteorological Department. Step wise regression analysis is carried out and effective relationship among the above variables are found out which helps us to predict the catchment yield in monthly and yearly basis with a satisfactory accuracy level.