A Non‐Graphical Method of Determining u and W(u)

A method is presented for determining values of u and W(u) for u greater than 0.01 from time‐drawdown data without the use of graphical approximations or type‐curves. The method utilizes the function Z(u) which is defined in the paper and makes possible the application of statistical analyses of test data for bounded aquifers and other types of complex field problems. If the field data are taken so that t is a consecutive multiple of two, the method can be applied directly to the drawdown observations. An example of this method used to analyze test data for a bounded aquifer and a table of values of W(u) and Z(u) for selected values of u between 0.01 and 4.6 are also presented.