See 12 Across

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Across
  1. 3. Gas produced from anaerobic digestion
  2. 4. Barrier that prevents vehicles from leaving roadway
  3. 5. Detailed construction drawing
  4. 6. Raised structure of compacted earth
  5. 8. Rate of water flow in a channel
  6. 9. Framework of connected triangular units
  7. 12. The message of this crossword
  8. 14. Preventing water flow in soil or foundations
  9. 15. Vegetated rooftop for stormwater and energy benefits
  10. 18. Gradual downward movement of soil
  11. 20. Semi-solid byproduct of wastewater treatment
  12. 21. Measuring land to determine points and layout
  13. 23. Soil layer beneath pavement
Down
  1. 1. Ability of soil to transmit water
  2. 2. Modification to construction contract
  3. 5. Drilled hole for soil sampling
  4. 7. Underground layer storing groundwater
  5. 10. Material used for road surfaces
  6. 11. Instrument used to measure air pressure
  7. 13. Base that transfers structural loads to the ground
  8. 16. Gauge used to measure precipitation
  9. 17. Distance wind travels over water surface
  10. 19. Pollutants released into the atmosphere
  11. 22. Circular intersection improving traffic flow