Abstract
In this paper two examples for the calculation of water influx from Ref [1] are resolved using different techniques (Van Everdingen and Hurst[2], Fetkovich[3], Marsal[4]) in order to demonstrate that certain conditions need some modification on the Marsal Equations in order to be more consistent with the original solution of Van Everdingen and Hurst. These modifications are not constant but are a function of the range of reD and tD .