地下渠道，亦称“暗渠”。指埋设于地下一定深度用于灌溉的输水渠道。
地下渠道被称为“福格拉斯”（foggaras）挖掘到地下水并把水引进农田而不致损失蒸发。
Underground canals—called foggaras—tapped into groundwater and directed it to fields without loss to evaporation.
他们主要以网络为渠道进行着“地下式”的交流。
Their main network channels in the "underground" type of exchange.
由于地下水位高，造成地下水对渠道混凝土板的渗透破坏、冻胀破坏、硫酸盐侵蚀破坏和膨胀土膨胀破坏。
The high level underground water causes damages on the concrete board of the canal such as seep, freezing, sulfate erosion and swelling by swelled ground.
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