Hardscape & GradingCâu 49 / 100
A French drain is BEST described as what?
a.A surface concrete channel
b.A raised planter box
c.A type of retaining wall
d.A gravel-filled trench with a perforated pipe that collects and redirects subsurface water
Giải thích
A French drain is a trench filled with gravel around a perforated pipe that intercepts subsurface and surface water and carries it to a discharge point. Water enters the pipe through the perforations and flows by gravity away from the problem area. It is used to relieve soggy soils and protect foundations.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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