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4kDt absciss analysis anisotropic Annex aquifer test assumptions and conditions assumptions listed calculate kD Chapter coeﬂicient conﬁned aquifer constant covering layer data from pumping delayed yield difference per log discharge rate distance double logarithmic paper drawdown data drawdown difference drawdowns measured equation ﬁeld ﬁrst formula groundwater Hantush hydraulic conductivity hydraulic resistance impervious inﬂection point inﬂuence isotropic Jacob method Land Reclamation log cycle logarithmic scale match point meters methods of analyzing nomogram numerical values observed data curve observed drawdown partial penetration phreatic level piezometers plotted points Procedure pumping period pumping test 4Oude pumping test data recharge boundary residual drawdown screen Section semi-conﬁned aquifer semi-pervious layer single logarithmic paper slope steady-state drawdown steady-state ﬂow storage straight line Substitute the values thickness Thiem time-drawdown curve transmissivity type curve unconﬁned UNSTEADY-STATE FLOW values into Eq values of kD versus water level water table