Crossword Highway Drainage

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Across
  1. 2. Necessary upkeep to keep drainage system functioning properly
  2. 7. Large pipes or concrete structures allowing water to pass underneath roadways
  3. 12. (2 words) Consideration of the effects on the surrounding environment
  4. 15. (2 words) Removal of water from road surface using features like gutters, curbs, and ditches
  5. 17. Wearing away of soil and other materials by water, wind, or other natural agents
  6. 18. Gathering water from the surface or subsurface
Down
  1. 1. (2 words) Material used to line trenches to prevent soil erosion and filter out debris
  2. 3. The physical structure of the constructed highway
  3. 4. (2 words) Removal of water from beneath the road surface using features like perforated pipes, underdrains, and drain tiles
  4. 5. The transportation of water from collection points to a suitable outlet or drainage facility
  5. 6. (2 words) The process of collecting, conveying, and disposing of surface and subsurface water
  6. 8. (2 words) Amount of rainfall in the area in a given time
  7. 9. (2 words) Outlets or facilities for water collection and disposal
  8. 10. Deposition of sediment or other material carried by water or wind
  9. 11. The safe release of water into the environment
  10. 13. Slope of the road surface
  11. 14. (2 words) Structures designed to capture water and direct it into the drainage system
  12. 16. The protection of motorists and pedestrians from hazardous conditions caused by standing water or flooding