Transmissivity of the Snake River Plain aquifer at the Idaho National Engineering Laboratory, Idaho

Aquifer-test data of 183 single-well tests at 94 wells in the Snake River Plain aquifer were analyzed to estimate values of transmissivity. Estimates of transmissivity for individual wells range from 1.1 to 7.6 x 105 feet squared per day, nearly 6 orders of magnitude. These data were determined in a consistent manner and are useful for describing the distribution of transmissivity at the Idaho National Engineering Laboratory. The results of type-curve analysis of 37 tests at 26 wells were used to develop a regression relation between specific capacity and transmissivity. This relation, in turn, was used to analyze all specific-capacity data. Values of relative uncertainty for estimated values of transmissivity generally ranged from 0.1 order of magnitude for type-curve analysis to 0.5 order of magnitude for specific-capacity analysis with measured drawdown of less than 0.1 foot. 16 refs., 10 figs., 3 tabs