Comparison of GIS based SCS-CN and Strange table Method of Rainfall-Runoff Models for Veeranam Tank, Tamil Nadu, India

One of the major problems confronted by the hydrologists for many years is the prediction of runoff from a given basin for a known rainfall. In this situation, development of a rainfall runoff model is important in Veeranam tank catchment located at latitude 11° 15’00” and longitude 79° 30’00’ E in Cuddalore District of Tamilnadu, India. By considering the above said aspect the rainfall-runoff model studies were carried out by using two rainfall-runoff models, one of the empirical strange method and SCS-CN method. All these works are carried out for three rain gauge stations, namely Jayankondam, Lower Anaicut and Senthurai station which come under Karuvattuodai sub watershed (4B1A5F) of Coleroon river basin, Tamilnadu, India with four years of daily rainfall (2000 – 2004). From the results it is inferred that scs – in method yields more run off than strange Table method even by considering the parameters which influence run off characteristics. Index Terms Runoff Model, Remote sensing and Geological information system Soil conservation service – curve number, strange table ——————————  ——————————