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| 41. | opening for drainage |
| 排水巷道 |
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| 42. | water drainage roadway |
| 排水平巷 |
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| 43. | base course drainage |
| 基地排水 |
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| 44. | key drainage structures |
| 排水枢纽 |
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| 45. | open ditch drainage |
| 明沟排水 |
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| 46. | standard of drainage |
| 排水标准 |
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| 47. | obstacle to drainage |
| 排水障碍 |
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| 48. | co-operative drainage |
| 合作排水 |
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| 49. | drainage surface channel |
| 排水明渠 |
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| 50. | surface mine drainage |
| 露天矿排水 |
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