Determining Transmissivity



See Also:

Eden-Hazel Method

Birsoy-Summers Method


From a step-drawdown test, transmissivity can be determined with the Eden-Hazel method and the Birsoy-Summers method.


For the Eden-Hazel method, drawdown in the well is described by the equation:




b is the slope from Part 1 of the Eden-Hazel method. Aquifer transmissivity will be displayed over the graph of Part 1 of the Eden-Hazel method.


For the Birsoy-Summers method, the slope of the line (actually change in specific drawdown per log cycle of adjusted time) is used to determine transmissivity with the equation:




Storativity is calculated from: