Their most important traditional use was for grinding grain, though in certain areas their use in land drainage and water pumping was equally important.

风车最主要的用途是磨粉，在某些地区用于灌溉土地和抽水，其作用也同样重要。

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If the water table intersect the land surface, groundwater will flow out onto the surface at springs, whether to be collected there or to subsequently flow farther along a drainage.

如果地下水位与地表相交，地下水将在泉水处流出地表，聚集于此或是随后沿着排水系统进一步流动。

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They include the brown mudfish in New Zealand, whose wetland habitats have been virtually destroyed through drainage schemes, irrigation and land development.

包括新西兰的棕色泥鳅，它们的湿栖息地已几乎因为排水设施建设，农业灌溉和土地开发而遭完全破坏。

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The project is a partnership of the Environment Agency, Huntingdonshire District Council, Middle Level Commissioners, which is a group responsible for land drainage, Natural England and the Wildlife Trust.

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But Mr Mustow admitted that much more needed to be done to ensure that farmers did not increase flood risk with land drainage schemes and that developers and builders ensured that new developments allowed water to drain into the soil rather than flushing into the sewers.

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Aerial photographs from the descent show drainage channels apparently flowing off land into what seems to be a dark ocean, possibly composed of some tarry substance.

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