Effect of Rainfall on Groundwater Quality in the Delhi-NCR Region.

The following study is aimed to determine the effect of rainfall on the quality of the groundwater in the Delhi-NCR region. Samples of groundwater were collected from a total of 10 sampling stations during the prerainfall/(June-July 2019) and post-rainfall (November-December 2019) seasons for the analysis of water quality parameters suggested by the World Health Organization. Lab tests were conducted to determine various physiochemical parameters of the water sample namely pH, Chloride (Cl-), Calcium Hardness (CH), Total Hardness (TH), Sulphate (SO4--), Nitrate (NO3-), Fluoride (F-) and Total Dissolved Solids (TDS). The Water Quality Index was then calculated and a brief comparison with the permissible values was also performed. The results show that most of the studied water sample were of poor quality in the case of post-rainfall collected water samples. [ABSTRACT FROM AUTHOR]