Ｌ字溝えるじこう

noun

L-shaped gutter; L-shaped drain

A drainage channel with an L-shaped cross-section, commonly used in civil engineering and construction.

• 道どう路ろの側そっ溝こうにはＬ字じ溝こうがよく使つかわれている。

  L-shaped gutters are often used for roadside ditches.