Matrix Engineer's Week Crossword

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Across
  1. 7. Early surveying device for measuring angles
  2. 9. Common term for mid-height of a water pipe
  3. 11. Association providing stopping distance and bridge design guidelines
  4. 14. Opposite of compression
  5. 15. Boulders used for bank protection
  6. 16. Council providing engineering and surveying licensure
  7. 17. Road sign made of an equilateral triangle
  8. 19. Early structure used to convey water
  9. 20. Common term for top of a manhole
Down
  1. 1. Primary material used to reinforce concrete
  2. 2. Royal headpiece or inside top of a pipe
  3. 3. Diverging type of this rare stone interchange abbr.
  4. 4. Curve in a roadway that changes radius midway through
  5. 5. Force divided by area or a big submittal feeling
  6. 6. Height of a column of water above a datum
  7. 8. Site of pyramids outside Cairo
  8. 10. Volume per unit of time or Progressive rep with a “w”
  9. 12. Structure that regulates the Colorado River located in Black Canyon
  10. 13. Roadway barrier named after the state where it was developed
  11. 15. Intersection where traffic flows in a circle
  12. 18. Worlds tallest building for short
  13. 20. Goldberg of these overly complicated machines