Effect of incomplete recovery prior to a pump test in a large-diameter well

In South India, dug wells tapping the weathered zone of granitic terrains are very common. As these are low-permeability zones, the recovery after each pumping phase is slow and remains incomplete even till the onset of the next pumping phase. The present study shows that a reliable estimate of hydrogeologic parameters is possible through a pump test in such a well provided the recovery rate prior to the test is fed into a numerical model used for the interpretation of the data.