The High/Low Rainfall Fluctuation Mapping through GIS Technique in Kodaikanal Taluk, Dindigul, District, Tamil Nadu.

The study of rainfall pattern is very important for the agricultural planning of any region. Monsoon depressions and cyclonic storms are the most important synoptic scale disturbances which play a vital role in the space – time distribution of rainfall over India. In the present study, an attempt has been made to understand the rainfall fluctuation study through GIS Technique in Kodaikanal Taluk, Dindigul Dist. Tamil Nadu. The study area highlights the rainfall variation with respect to spatial distribution for the GIS. 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 were assessed for all the seasons. These results were taken into GIS platform to prepare the spatial distribution maps. Winter, Summer, Southwest and Northeast monsoon seasons spatial distribution maps result reveals that 996.13 km2, 969.97 km2, 1004 km2 and 983.39 km2 area falls in high rainfall received shadow zone respectively. Last 10 years (2005 to 2014) annual average rainfall spatial distribution map result reveals that 993.71 km2 areas fell under high rainfall shadow zone with more than 261 mm rainfall. It shows the annual average rainfall distribution is very high in the study area. The high rainfall domain occupies 84.9 % of the study area.