On the use of late-time drawdown in interpreting aquifer pumping test

The review aims to provide a common understanding of the use late-time drawdown interpret aquifer pumping tests. first part provides an overview in literature illustrate where and how term is being used. A discussion on practical implications using its significance then presented. shows three main ways: application Cooper Jacob time-drawdown method, description third segment unconfined drawdown-time curve, when trying estimate representative/effective transmissivity parameters heterogeneous aquifers. Unlike other two situations, data typical aquifers supported by groundwater flow principles hence has meaningful application. aspects highlighted this are important improve theoretical knowledge required for analysing interpreting test data.