Abstract
Approximate travel times are given for a solute to reach a well from an injection point, for a well of finite radius screened throughout an aquifer resting on an impervious sole where: (1) there is a constant head at the outer boundary of the flow region; and (2) there is no flow across the outer boundary (both models were discussed earlier). In both cases, the time of travel for a solute entering the top of the aquifer at a point r k satisfies approximately a logarithmic relationship as follows: In r k = A ln t + B where t is the time of travel from the point r k to the well, and A and B are constants depending on the problem considered. This linear relationship holds only up to a certain distance of injection from the well. This distance varies with the problem considered.
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