Abstract
ABSTRACT Groundwater vulnerability assessment is very important for protection and management of groundwater resources. In this study, groundwater vulnerability assessment of upper Alwar district of Rajasthan state is done using original and modified DRASTIC model using two different methods: (1) one parameter sensitivity analysis (OPSA), (2) optimizing weights by maximizing the coefficient of correlation between vulnerability index (VI) and observed nitrate () values using GRG (generalized reduced gradient) solver in excel. These models are validated using observed values of at 53 observation wells. The result of the study showed that the DRASTIC model with weight optimized using GRG solver gives highest correlation (r = 0.54) between VI and values as compared to original DRASTIC (r = 0.5), whereas the model with weights modified using OPSA gives the lowest correlation (r = 0.2). It is also observed that OPSA gives very low weight to depth and hydraulic conductivity parameter and very high weight to recharge parameter, whereas exact opposite is observed in original and weights optimized DRASTIC model. Hence, it is important to calibrate the weight of DRASTIC parameters for a specific site under study and chosen contaminant to overcome the subjectivity related to the originally assigned weights.
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