Minimum dilution can be looked at as the reciprocal of the maximum concentration allowable. This depends on flow, stratification, and currents. If you double the flow, the dilution worsens. If you unstratify the water column, the dilution is improved. If you have currents that are perpendicular to the risers, dilution is improved.
Parallel currents have no effect compared to zero current.
R. Buchsbaum asked over what area dilution is being considered. Dilution is measured 60 meters outside of the area after initial rise. S. Testaverde asked what would happen if all factors were varied at the same time. M. Mickelson replied that the physical model varied each parameter individually. Since the plume tracking study will be undertaken in the field, it will examine the variability of all factors at once.