groundwater level fluctuation studies in part of tindivanam taluk, villupuram district, tamil nadu

Research Article
Karthikeyan. A and Senthil Kumar.G.R*
Rainfall, sub surface geology, recharge, water level

The study area, part of Tindivanam taluk in Villupuram district is located between 79°30’ to 79°52' east longitudes and 12°18' to 12°24' north latitudes. The geology of the study area is made up of granite, granitic gneiss, and Charnockite of Archaean age which are with few intrusions by dolerite dyke and pegmatite. Groundwater being the only source of water in the study area, quantitative assessment of existing ground water resources and the influence of the monsoon rainfall on the groundwater has to be studied. Recharging depends on the factors like climate, geomorphology, topography, soil and most importantly sub surface geology. The study area receives rainfall through northeast monsoon, southwest monsoon and non monsoonal rainfall. The average annual rainfall of the study area is 1221 mm. The depth to the water level varies from 3.03 m to 30.30 m (bgl) during pre monsoon period and 1.52 m to 15.15 m (bgl) in post monsoon. The fluctuation of water level ranges from 0.00 m to 21.21 m. The water level is deeper in topographically elevated regions and shallower in plain surface terrain. From the water level maps, it is inferred the groundwater flow direction is north – south. The groundwater has been recharged by the monsoon rainfall to a considerable extent which has been reflected by the water level maps and chart. The geological and geomorphological features in the surface and subsurface of the study area favour the rainwater recharge and flow towards the plain land surface