TN-14 : Flow towards well with storage in leaky aquifers

Abstract

The formulation of strategy for the optimal management of groundwater demands a knowledge of the relationship between the pump ages in the wells to the drawdowns in the aquifers both in spatial and temporal coordinates. Such relationships are available from several analytical solutions in well hydraulics, the notable being Theis and Hantush solutions. However, they have been derived under highly idealised conditions. Thus there exists a need to refine the analytical solutions by incorporating the actual field conditions to the extent possible. Most of the available solutions consider the well to be a line sink and do not consider the storage in the well while most of the wells in the country are dug wells of large diameter with huge amount of storage in them. The application of the existing methods of analysis for the assessment of aquifer parameters or for modelling the aquifer or for simulating the drawdown history from the wells of this type would be erroneous. Hence in the present investigation, the simulation for the unsteady flow towards finite diameter wells storage has been attempted. The analysis includes the problems of wells with storage in leaky aquifers both for fully and partially screened wells.