Graphical Solution to the Drawdown Due to Pumping of the Limited Confined Aquifers in Unsteady State Flow

At the initial stage of pumping, the discharge-drawdown relationship in a limited confined aquifer is identical to that of an extensive aquifer followed by a transition-period during which the zero-drawdown contour moves from the nearest to the farthest boundary. After that the time-rate of increase in drawdown assumes a constant value. A graphical method is proposed in this paper to calculate the drawdown at a place due to unsteady flow in a limited confined aquifer.