The design of an aquifer remediation operation is merely a case of practical experience today. The contaminant is flushed out of the soil by means of a system of injection and recovery wells. The time needed and the amount of water that has to be flushed through the soil to reach a certain required concentration are both important. The amount of water is expressed in terms of the so-called flush factor, which is equal to the ratio of the volume of this water and the volume of the pores in the soil to be flushed. The time needed and the.
