Work had been going on in a couple of small towns that I had passed through to install drains and water pipes.

我经过几个小镇，安装排水和供水管道的工程正在进行。

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Rainfall helps keep it clean: water seeps through the rubber and drains into pipes just below the surface.

下雨则可以让它保持干净：水流渗过橡胶颗粒并注入表层之下的排水管道中。

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The plans show the drains and plumbing fixtures, but the plumber figures out how to route the pipes and hook up to the water main and sewer.

计划指出排水沟和排水管固定装置，而管道工则构想如何布置管道和连接到总水管和下水道。

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Rainfall helps keep it clean: water seeps through the rubber and drains into pipes just below the surface.

ECONOMIST: Monitor

The charity said that overflow pipes which prevent sewage backing up into drains and houses in times of heavy rain are necessary in an emergency.

BBC: Charity warning over raw sewage discharge levels

Conservation group WWF says the extensive use of cannons drains the water and electricity supplies, and the building of the pipes disfigures the mountain landscape for many years.

BBC: Snow cannons pump out artificial snow