2.1.3.1.3 Hydraulic parameters

The state groundwater databases contain limited pumping test data, which usually include the date and duration of the test, initial water level, pumping rate, and maximum drawdown. The transmissivity of relevant aquifers was estimated based on the pumping test data adopting the TGUESS approach, where transmissivity is estimated from specific capacity based on the Cooper-Jacob approximation to the Theis equation (Bradbury and Rothschild, 1985). Hydraulic conductivity was computed from the derived transmissivity data where screen interval data were available. However, where hydraulic conductivity or transmissivity was available in the original state database, this value was kept as the primary value for the statistical analysis. When multiple hydraulic conductivity or transmissivity records were present, the median was used for the statistical analysis.