ABSTRACT
This chapter presents two facets of prediction techniques relates to: the general direction of contaminant movement and the rate of spread of contaminants from the waste facility. Flow nets can be adapted to help in the prediction of contaminant spread. The value of the flow-net approach to the analysis of contaminant spread is that: it provides an indication of the direction of plume migration from the waste body; and it enables an accurate determination to be made of the rate of seepage from the disposal facility. The greatest differential-head elevations dealt with in waste-disposal scenarios are generally imposed by liquid wastes, and/or sludge and slime impoundments. The waste-material data necessary for the solute-transport analysis relates to the quality of leachate likely to infiltrate from the landfill, or waste pond, into the aquifer. In the case of ponded wastes, the parameter of interest is, generally, the vertical equivalent permeability of settled solids.
