The water management contains standard shaft, 1200mm in diameter, which can be constructed in traditional chimney style or by the caisson sinking method, with the units having a 120mm wall. Being thicker than standard precast concrete manhole units, they are joined using 3 No 20mm diameter high tensile bars.
The bars run vertically through the shaft wall with sequential units being bolted on as the landfill proceeds.
Visit the Marshalls CPM website for more information on Controlling water management system