The area has good natural drainage.

这个地区有良好的天然排水系统。

《牛津词典》

If you are trying to manage it, you must first divide your area of concern into drainage basins.

如果你想要操控水，你必须先把那些你所关注的地区划分成一个个地势上的盆地。

youdao

Mark off an area for your garden that gets more than six hours of sunlight per day and has excellent drainage and sandy soil.

选定地点。 荒漠花园用地需要每天六小时以上的日照和透水性好的沙质土壤。

youdao

The settlers had plans to remove water from the area and in the eighteen eighties developers began digging drainage canals.

VOA: special.2009.06.30

The plan drew six objections raising concerns about car parking, drainage and that the area would be unsightly.

BBC: Potatoes

Neighbours have raised concerns that it could create a lack of parking in the area and cause problems with the drainage systems.

BBC: Coupee Lane site

They say that the area is environmentally damaged anyway, thanks to drainage and over-grazing, and that the new wind farms would have only a minor impact.

ECONOMIST: Wind farms