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Assessment of groundwater quality and level by finite element modelling

Author: 
Dr. Rajaveni, S. P., Dr. Muniappan, N., Anto Amala Ancy R., Beulah, A., Golda Jebamiranda, D. and Jeya Suganthi, S.
Abstract: 

Safe drinking water is the primary need of every human being. Groundwater is believed to be clean and free from pollutants as compared to the surface water. Hence, it is being used invariably as a major source for drinking, domestic and irrigation purposes. The purposes of this study are to (1) asses the groundwater quality parameters such as pH, Hardness, Chloride, Fluoride, Sulphate and Nitrate; (2) prediction of groundwater head by numerical modelling. During this study, field visit was carried out to collect groundwater samples. The groundwater samples collected from the field were analysed in the laboratory by using standard procedures for different quality parameters. The results of analysis obtained were compared with the drinking water quality standards specified by Indian standard (IS 10500:2012). Finite element modelling was cenceptualized in FEFLOW software. Hydro geological parameter were assigned and model calibration are successfully done using FEFLOW. The model was calibrated in steady state condition with R2 value of 0.959. Transient state calibration done with R2 value of 0.897. After successful calibration model was used to predict with the application of one of the artificial recharge structure of percolation pond. Prediction result shows that the increase of ground water head by 1.5m with the implementation of percolation pond. Thus, the increase of groundwater head can improve the groundwater quality in the study area.

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