Robert D. Mutch, Jr., P.Hg.
Mutch Associates, LLC
Hawthorne, New York
Abstract: Aquifer testing of fractured rock aquifers has been undergoing a renaissance of new technologies based on hydrogeologic property of “hydraulic diffusivity”. Hydraulic diffusivity (α) is the property that governs propagation of a wave of drawdown or rebound through a geologic medium and equals:
One of the earliest applications of hydraulic diffusivity is the the Neuman and Witherspoon “ratio method”, which is designed to measure aquitard properties under very particular conditions. A second generation hydraulic diffusivity-based method is the Hsieh “cross-hole” technique, which is applicable to a wide range of hydrogeologic conditions, including both fractured rock and porous media aquifers. Multiple pumping tests and dozens of monitoring points allow the analysis of large amounts of data permitting definition of the ellipsoid of hydraulic conductivity, if applicable, or the “architecture” of the aquifer.
Convergent flow tracer tests can be conducted during many aquifer tests to cost-effectively define fracture porosity – a key parameter in understanding average linear groundwater velocity in fractured rock.
New York State 1 PDH Credit Is Pending But Expected
*Bio: Robert D. Mutch, Jr., P.Hg.: Robert D. Mutch, is Principal Groundwater Hydrologist and President of Mutch Associates in Hawthorne, New York.. He has more than 40 years of experience in groundwater hydrology, contaminant fate and transport, groundwater flow and contaminant transport numerical modeling, and remediation of hazardous waste disposal sites. He served for 20 years at Manhattan College as an Adjunct Professor where he taught graduate level courses in applied hydrogeology and numerical groundwater modeling. More recently he served for15 years as an Adjunct Professor at Columbia University teaching a course in contaminant transport in groundwater. His particular areas of interest include fractured rock hydrogeology, aquifer testing, and DNAPL behavior. He is a registered professional hydrogeologist (P.Hg.) and recently retired as a professional engineer in New York, and New Jersey.
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