Waterlogged soils occur in areas that are flat or have poor drainage.

涝渍土壤发生在地势平坦或排水不畅的地区。

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A flat roof has poor drainage.

平的屋顶排水差。

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Poor drainage causes deficient soil aeration and death of the roots.

排水不良能减低土壤的透气性，使根死亡。

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Even in Maputo city, poor drainage and illegal building meant that the rains caused mudslides that destroyed houses and blocked roads.

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Heavy rainfall or poor drainage systems can trigger a collapse.

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Additionally, because of poor drainage, water ponds formed on the VML. These water ponds produced more methane gas, and the subsequent runoff traveled back into the VML and the Speedway Landfill.

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