Dynamic plume attachments occur when the discharge flow interacts strongly with a boundary in the near-field. Such near-field boundary interactions present the possibility of high pollutant concentrations and undesirable benthic impacts. Often near-field attachments are avoidable with proper outfall design. The image on the right shows a laboratory experiment where boundary interaction occurs in the near-field. This flow also exhibits a subsequent buoyant lift-off and an unstable near-field which is indicated by a CORMIX (..A4) flow class suffix as described below.