HIGH/LOW RAINFALL DOMAIN DEMARCATION MAPPING USING GIS AT SURULI WATERSHED, VAIGAI BASIN, TAMIL NADU, INDIA

M.Mohammed Rafi; S.Venkateswaran; M. Vijay Prabhu

Volume : VI, Issue : II, February - 2016

HIGH/LOW RAINFALL DOMAIN DEMARCATION MAPPING USING GIS AT SURULI WATERSHED, VAIGAI BASIN, TAMIL NADU, INDIA

M. Mohammed Rafi, S. Venkateswaran, M. Vijay Prabhu

Abstract :

Rainfall analysis is employed to evaluate the season wise rainfall variation of Uttamapalyam and a small part of Periyakulam Taluk, located in the western corner of Madurai District of Tamil Nadu. an attempt has been made to understand the rainfall fluctuation study through GIS Technique. To achieve the aim, the rainfall variations Post–monsoon (January and Feuary), Pre–monsoon (March to May), Southwest monsoon (June to September) and Northeast monsoon (October to December) has been attempted. This paper highlights the rainfall variation with respect to spatial distribution. The rainfall data for the period of 2005 to 2014 were collected in the Statistical Department wing (PWD) Govt. of Tamil Nadu. The rainfall data ware assessed for all the seasons. These results were taken into GIS platform to prepare the spatial distribution maps. The winter season GIS map reveals that all locations are having less than 34 mm rainfall noticed in the study area and were classified as poor class category. Summer season GIS image reveals that spatially 1130.44 Km2 area falls in the poor class category. The southwest monsoon GIS map reveals that spatially 79.25 Km2 area falls in the good class category and 464.83 Km2 area falls in moderate class category. Northeast monsoon GIS image reveals that spatially 1366.80 Km2 areas falls in the low rainfall category. Average annual rainfall spatial distribution result shows that spatially 0.74 Km2 areas fall in good class category, 201.59 Km2 area fall in moderate class category and rest of the area 1375.59 Km2 fall in poor class category.