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New ASCE Standard 70 helps in estimating hydraulic properties of ground water systems


April 1, 2020
By Ground Water Canada

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ASCE’s newest standard , ANSI/ASCE/EWRI 70-19,seeks to help probabilistic and empirical characterization and understanding of the saturated hydraulic conductivity (Kstat), a key ground water parameter.

Estimation of Aquifer Hydraulic Properties by Inverse Numerical Modeling of Aquifer Pumping provides guidelines for estimating the hydraulic properties of a ground water system by inverse numerical modelling of aquifer pumping tests. ANSI/ASCE/EWRI 70-19 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 ground water 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.

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This standard will be useful to environmental engineers, water resources engineers and any professional who uses hydraulics in engineering.

Details may be found on the ASCE website.