
Closed Pipe-conduit [China]
A Rat tunnel is a kind of subdrainage. It is a drainage duct formed through extrusion or oscillation in soil layer by pulling a mole plough with a tractor. The rat tunnels in a field should be used together with a concealed conduit drainage system in order to safely and …
- ຜູ້ສັງລວມຂໍ້ມູນ: Mei Zhao