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Mass Flux/Mass Discharge Concepts for Estimating Dilution

In this series of lectures, we will discuss how dilution is an attenuation process – sometimes. We start with the basics, and review groundwater flow and one of the “top ten things” that every hydrogeologist should know: the distinction between Darcy Velocity and Seepage Velocity. Next we give some examples of regulatory programs where dilution is considered an acceptable attenuation process. Then we present how dispersion and mixing in wells are dilution-related processes. Finally we show how the emerging field of mass flux/ mass discharge can be used to see if a contaminant plume is strong enough to impact water supply wells and/or streams, and to see where your plume ranks in the “Plume Magnitude Classification System.”

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