Everything about ระบบระบายน้ำฝน
Gutters: Gutters are shallow channels that acquire water at the edges of the roofs. Even though gutters are more common on household roofs, they could even now be utilized on business roofs, to be a complement to inside drainage or by themselves.อ้างอิง-ภาพ : สำนักงานทรัพยากรน้ำแห่