RN-3 : Hydrogeological parameters in hard rock area

Abstract

The wide use of large-diameter wells for groundwater abstraction especially in hard rock areas calls for a thorough understanding of the flow dynamics in these wells for better management and development of groundwater resources. For a quantitative understanding of the optimum yield and performance of large-diameter wells, pumping tests are carried out in these wells. The analysis of such test data pose a special problem because of the well storage, meagre groundwater flow due to low transmissivity of the aquifers etc. Over more than two decades, considerable work has been carried out on methodology relating to the analysis of pumping test data from large-diameter wells. In the present report, it is attempted to put together all the techniques related to pump test analysis, so that the report would help as a guide for the groundwater hydrologists dealing with large-diameter wells. The merits and limitations of individual techniques have been discussed in detail. The recommendations pertaining to future research activities for better management of groundwater resources in hard rock terrains have been made.