Dilution Attenuation Factor definition
Dilution Attenuation Factor or "DAF" means a unitless number greater than or equal to unity and represents the ratio of dissolved phase concentration at a downgradient location to the concentration at an upgradient location. It represents the reduction in concentration due to the combined influence of several factors (diffusion, dispersion, adsorption, decay, volatilization). It is applicable for all media, but is most commonly used for the unsaturated and saturated zones. DAF is generally estimated using a fate and transport model or based on site-specific data.
Dilution Attenuation Factor means the ratio of the contaminant concentration in soil leachate to the concentration in groundwater at the receptor point.