Direction of Overland Flow

{
  "id": "MLC-T-ENV-008073",
  "term": "Direction of Overland Flow",
  "field": "Environment",
  "definition": "Determined on a topographic map by drawing flow lines perpendicular to contour lines. Direction of flow will normally be along these flow lines, from areas of higher elevation towards areas of lower elevation but can be affected by man - made barriers such as walls and sewers. The determination of flow direction is important for identifying the drainage area upgradient of sources at the site and for identifying the overland segment of the hazardous substance migration path.",
  "subject": "Health and safety",
  "references": [
    "Hazard Ranking System Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/direction-of-overland-flow/"
}