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ICalculations for Aquifer Properties <br /> . Transmissivity - Jacob Method <br /> I1 Graph Drawdown vs Time for each monitoring well on semi-logrithmic paper <br /> Drawdown in feet <br /> Time in minutes <br /> 2 Calculate change in drawdown (As) per log cycle for each graph <br /> 3 Determine Transmissivity(T) <br /> T =264 Q / As Q--pumping rate in gallons per minute (gpm) <br /> T=transmissivity(gpd/R) <br /> Storativity <br /> 4 Extend line on Drawdown vs Time graph for each well <br /> Read time where this line crosses zero drawdown <br /> Convert time to days (t4) <br /> S Determine radius from pumping well in feet (r) <br /> For pumping well, use well diameter <br />' 6 Calculate storativity(S) <br /> S = 03Tto/r2 <br /> I <br /> I <br /> I <br /> Advanced GevEnviraarnental Inc <br />