GROUNDWATER MANAGEMENT BY THE APPLICATION OF SUBSURFACE DYKE AND ITS FUTURE SCENARIO IN CHHATTISGARH USING MODFLOW

Abstract

Groundwater is a finite resource, which is being overexploited due to increase in demand over the years leading to decrease in its potentiality. This drawdown of groundwater results into agricultural drought in various regions and also there is lack of drinking water in summer season. Thus there is a need of sustainable development and management of groundwater resources, for which Subsurface dyke can be one of the good solutions. In this study Sub surface dyke are briefly described and detailed information about purpose and outcomes of various subsurface dyke constructed in India and other countries. The use and usefulness of the subsurface dyke as a means of sustainable development, and their management of groundwater resources are been analyzed with the help of two case studies. In the first case study subsurface dyke constructed in Bhavaji nagar, plaghat district, Kerala while in the second one, a hypothetical idealized aquifer for Patan region of Durg district of the Chhattisgarh state is selected. For the performance evaluation, and for the analysis of the impact of the Sub surface dyke on the groundwater behaviour, numerical simulation is opted. For this purpose, a wellknown computer software, Visual MODFLOW,a Modular Three-Dimensional Finite Difference Groundwater Flow Model of U.S. Geological Survey,(McDonald and Harbaugh.2012) is used. The input such as depth of aquifer, net recharge, aquifer yield, soil type, and hydraulic conductivity are incorporated in the model. The final output of the graph shows that there is increase in groundwater table after the construction of subsurface dyke, around 80% of the area there was more than 1.5 m rise in the ground water table. This study produces a very valuable alternative source for ground water table as it reveals a very comprehensive indication of increase in groundwater table. This will help to overcome the problems of groundwater depletion, which helps to provide drinking water in summer and improve drought condition in the state.