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ANSI/ASCE/EWRI 70-19 provides guidelines for estimating the hydraulic properties of groundwater systems by inverse numerical modeling of aquifer pumping tests.

Prepared by the Standards Committee on Fitting of Hydraulic Conductivity Using Statistical Spatial Estimation (called KSTAT) of the Standards Development Council of the Environmental and Water Resources Institute of ASCE

Estimation of Aquifer Hydraulic Properties by Inverse Numerical Modeling of Aquifer Pumping Tests is the fifth in a series of standards that seeks to enhance the probabilistic and empirical characterization and understanding of the saturated hydraulic conductivity (Kstat), a key groundwater parameter.

ANSI/ASCE/EWRI 70-19 provides guidelines for estimating the hydraulic properties of a groundwater system by inverse numerical modeling of aquifer pumping tests. This standard is applicable to situations where inverse methods based on analytical solutions for aquifer response to pumping are not applicable. Guidance is provided on using a numerical groundwater flow model to simulate an aquifer pumping test and estimate aquifer hydraulic properties. The methodology is based on minimizing residual error between observed and simulated heads by adjusting (calibrating) values of the pertinent aquifer hydraulic properties, for example, transmissivity, storativity, and leakance, such that there is a close match between the observed and simulated values.

Standard ANSI/ASCE/EWRI 70-19 will be useful to environmental engineers, water resources engineers, and any professional who uses hydraulics in engineering.