8.4 Pumping Test

Two types of pumping tests，that is，the step drawdown and constant rate tests，are usually carried out before dewatering.The major objective of a step drawdown test is to determine the capacity of a well while the main goal of a constant rate test is to obtain the hydraulic parameters，such as the coefficients of permeability，transmissivity，and storage.Although there are full and partial penetration well theories，as introduced in Section 8.3，the test well for a pumping test should fully penetrate into the aquifer in order for its results to be analyzed by using the well theories of the full penetration well，considering the equations for a partial penetration well，are too complicated and some of them are empirical formulas.