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| 21. | drainage facility |
| 排水设施 |
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| 22. | drainage indicator |
| 排水指示器 |
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| 23. | drainage measure |
| 排水措施 |
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| 24. | drainage culvert |
| 排水涵洞 |
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| 25. | drainage structures |
| 排水构筑物 |
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| 26. | biological drainage |
| 生物排水 |
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| 27. | vacuum drainage |
| 真空排水 |
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| 28. | gravity drainage |
| 重力排水 |
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| 29. | subgrade drainage |
| 路基排水 |
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| 30. | drainage fabric |
| 排水滤布 |
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