ABSTRACT
ABSTRACT: A stochastic approach, applied to field scale pumping test data from Scotland, is used to estimate a quantitative indicator of effective hydraulic conductivity (Kef), where Kef is considered a quantitative indicator of aquifer vulnerability to diffuse pollution. The unit specific capacity (USC ) is defined as a representative correlate to aquifer permeability. A survey of pumping test data in fractured aquifers in Scotland yielded a set of USC values with significant subsets for Devonian and Permian aquifers. The geometric mean of these subsets indicated USC values of 0.19 m/d for the Devonian and 2.47 m/d for the Permian aquifer rocks. The data set for the Devonian also permitted Kef to be evaluated as 0.20 m/d.
