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. The purpose of this investigation is to develop asemi-analytical procedure for quantifying aquifer and aquitard propertiesfrom a single extensometer record in lieu of the time-consuming developmentof more complex numerical models to quantify and constrain these parametervalues. Despite a limited 12-year record and the fact that water levels both decline and increase on an annual basis, estimates of both aquifer andaquitard parameters have been reasonably estimated at the Lorenziextensometer site in Las Vegas Valley, Nevada when compared to the estimatesdeveloped numerically. The key factors that allow for accurate estimates ofelastic and inelastic skeletal specific storage and hydraulic conductivityof the aquitards and elastic specific storage and hydraulic conductivity ofthe intervening aquifers is the presence of pumping cycles at multiplefrequencies, and measured heads at all the aquifer units covered in theextensometer record and the inherent assumption that the aquitards haveidentical hydrologic characteristics and are homogeneous and isotropic. This latter assumption is also a usual limitation in numerical modelling of these settings because of the complex temporal head relationships occurring within the aquitards that are rarely, if ever, measured.

Parameter estimation of a multiple aquifer-aquitard system from a single extensometer record: Las Vegas, Nevada, USA