Recharge Estimation in Walayar Sub Basin, Tamil Nadu, India: Comparison of Methods Balathandayutham K.1,*, Mayilswami C.2 1Dept. of. Soil and Water Conservation, AEC & RI 2Water Technology Centre Tamil Nadu Agricultural University, Coimbatore, India *Email: balathandayutham03@gmail.com
Online published on 24 December, 2014. Abstract Groundwater recharge is a key factor in water balance studies, especially in semi-arid regions. Efficient management of groundwater resource requires a good understanding of its status. This understanding necessitates a characterization of the utilizable quantities and the corresponding qualities. In the present study the groundwater recharge has been estimated at various locations in the Walayar sub-basin, which falls in the Parambikulam-Aliyar-Palar (PAP) basin located in Coimbatore district, Tamil Nadu. The annual groundwater recharge, recharge coefficient have been estimated by using empirical methods and water table fluctuation method. The related rainfall data were collected in ten rain gauge stations for the year 1983 to 2012. The results showed that average groundwater recharge of seven empirical methods and water table fluctuation method were varies with 262 to 117 mm per year and 46 to 193 mm per year respectively for the study area. Comparison of multiple methods is found to be valuable for determining the range of plausible recharge rates and for highlighting the uncertainty of the estimates. Top Keywords Recharge estimation, comparison of methods, ground water. Top |