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Impact of urbanization and drainage disconnectivity in the groundwater recharge potential – A case study

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2022 ASABE Annual International Meeting  2200918.(doi:10.13031/aim.202200918)
Authors:   S. R. Thiruchelve, S. CHANDRAN, KUMAR VELUSWAMY
Keywords:   annual recharge, drought index, groundwater level, rainfall, potential recharge zone.

Abstract. Water demand is found to be increasing in developing countries like India. Rainfall, the only source of freshwater, follows the increasing trend in peninsular India. Still, the level of groundwater exploitation has exceeded 70% in the major portion of North Western parts and deep Peninsular India. The objective of the paper is to initially assess the hydrological drought condition of the study area, which is located in the deep peninsular. To provides an overview of rainfall pattern groundwater level variation. To estimate annual groundwater recharge and suggest a suitable location for artificial recharge in the study area. On average, the study area receives 820.6 mm. Based on MK Test, the rainfall value in the study area indicates no significant trend in annual, seasonal, and monthly rainfall data. By the year 2030, annual rainfall is expected to reach 574 mm. Based on Sen‘s Slope method, the annual magnitude of rainfall is -0.2. The study region represents near-normal conditions throughout the past four decades based on SPI Index. The water level in the region fluctuated, varying from 6 to 11 m. The present study demarcates the potential zones for groundwater recharge by analyzing the eight influencing factors. Through Overlay analysis, 78.48 sq. km of a total 300 sq. km study area of the site is identified as potential for recharge. With the identified recharge potential site, it is suggested to identify a suitable recharge technique to manage the increasing water demand in the region.

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