Abstract
This research aims to evaluate the uncertainty in field permeability test and its corresponding generation structure, from hydraulic and stochastic point of view. It is assumed that the randomness in the test results is caused by the heterogeneity of hydraulic properties in the aquifer. By considering the spatial distribution of the actual permeability as a stationary random field, the variance of permeability value tested is theoretically formulated in terms of the head variance under a steady pumping condition. This paper shows that the accuracy of the steady pumping test is extremely improved when the observation well is located far from the pumping well. This is because the variance of head at the observation well reduces rapidly.
