The fact that dependent variables of groundwater models are generally nonlinear functions of model parameters is shown to be a potentially signi®cant factor in calculating accurate con®dence intervals for both model parameters and functions of the parameters, such as the values of dependent variables calculated by the model. The Lagrangian method of Vecchia and Cooley [Vecchia, A.V. & Cooley, R...

This study presents a semi-analytical solution for the problem of leakage in an unconfined aquifer bounded below by an aquitard of finite or semi-infinite extent. The homogeneous anisotropic unconfined aquifer of infinite radial extent is pumped continuously at a constant rate from a well of infinitesimal radius. The aquitard is also homogeneous , anisotropic and of infinite radial extent. Flow...

The impact of ground water pumping on nearby streams is often estimated using analytic models of the interconnected stream-aquifer system. A common assumption of these models is that the pumped aquifer is underlain by an impermeable formation. A new semianalytic solution for drawdown and stream depletion has been developed that does not require this assumption. This solution shows that pumping-...

r a 200 .029 : +1 208 cgiss.bo Summary A semi-analytical solution is presented for the problem of flow in a system consisting of unconfined and confined aquifers, separated by an aquitard. The unconfined aquifer is pumped continuously at a constant rate from a well of infinitesimal radius that partially penetrates its saturated thickness. The solution is termed semi-analytical because the exact...

Providing sustainable water supply for domestic needs and irrigated agriculture is one of the most significant challenges current century. This challenge more daunting in coastal regions. Groundwater plays a pivotal role addressing this hence, it under growing stress several parts world. To address challenge, proper understanding groundwater characteristics an area essential. In study, spatio-t...

At a geologic CO2 sequestration (GCS) site, uncertainty usually leads to large in the predictions of properties that influence leakage risk such as saturations and pressures potentially leaky wellbores, CO2/brine rates, metrics impacts on drinking water quality groundwater aquifers (e.g., sizes pH total dissolved solids (TDS) plumes aquifer). The these risk-related system can substantially affe...

Abstract. In this study, we explored the use of statistical machine learning and long-term groundwater nitrate monitoring data to estimate vadose zone saturated lag times in an irrigated alluvial agricultural setting. Unlike most previous studies that sought predict concentrations within aquifers, focus study was leverage available other environmental variables determine mean regional vertical ...

The nomenclature for Kansas aquifers needs revision. Many of the names currently in use were derived in an ad hoc manner without the benefit of a consistent set of hydrogeologically based guidelines. Because nomenclature forms the basis of scientific discussion of hydrologic issues, names should be clearly defined and consistently applied in order to prevent erroneous or unintended hydrologic i...