Mixing Zone

{
  "id": "MLC-T-ENV-017567",
  "term": "Mixing Zone",
  "field": "Environment",
  "definition": "1. An area where an effluent discharge undergoes initial dilution and is extended to cover the secondary mixing in the ambient water body. A mixing zone is an allocated impact zone where water quality criteria can be exceeded as long as acutely toxic conditions are prevented.\n\n2. A limited area or volume of a receiving water body where the initial dilution occurs and a permitted or authorized discharge occurs. Mixing zones are supposed to dilute or reduce pollutant concentrations below applicable water quality standards such that the applicable criteria in the standards are met at the edge of the mixing zone.\n\n3. Zone extending from the sea's surface to seabed and extending laterally to a distance of 100 meters in all directions from the discharge point(s) or to the boundary of the zone of initial dilution as calculated by a plume model approved by the director, whichever is greater, unless the director determines that the more restrictive mixing zone or another definition of the mixing zone is more appropriate for a specific discharge.\n\n4. An area where an effluent discharge undergoes initial dilution and is extended to cover the secondary mixing in the ambient waterbody. A mixing zone is an allocated impact zone where water quality criteria can be exceeded as long as acutely toxic conditions are prevented.",
  "subject": "Water",
  "references": [
    "National Pollutant Discharge Elimination System (NPDES) Glossary",
    "Chesapeake Bay TMDL Glossary",
    "40 CFR 125.121 (CFR 2013)",
    "NPDES Permit Writers Glossary; NPDES Permit Writers Manual Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/mixing-zone/"
}