12/2013 – Storm water management, Decorwall block

Storm water management with attenuation Ponds: In SA, Municipal by-laws require that storm water run-off at new property developments are channeled into attenuation ponds to prevent erosion, flooding and blocking of storm water systems.

The ponds release run-off into streams and storm water drainage pipes gradually

The ponds release run-off into streams and storm water drainage pipes gradually

An interlocking, permeable retaining wall system, the new Decorwall block system by Decorton Retaining System

The new Decorwall block system by Decorton and Terraforce


This detention pond, opposite Zevenwacht in Kuilsriver, South Africa, captures storm water runoff from the new buildings and parking in the area, where it is stored and potentially used for irrigation. The ponds release run-off into streams and storm water drainage pipes gradually, thereby alleviating sudden rises in water levels caused by rapid storm water run-off from paved surfaces/roofs in recently urbanized areas.

The blocks’ positive up-stand locking system also sped up construction, as concrete infill was not needed.

The blocks’ positive up-stand locking system also sped up construction, as concrete infill was not needed.

limit the space lost around the detention pond and to create the largest pond possible in the space available

The blocks limit the space lost around the detention pond and create the largest pond possible in the space available


An interlocking, permeable retaining wall system, the new Decorwall block system by Decorton Retaining System, was selected to limit the space lost around the detention pond and to create the largest pond possible in the space available. The blocks’ positive up-stand locking system also sped up construction, as concrete infill was not needed

Installation proved extremely difficult due to the high water table in the existing ground. Construction had to be carried out in stages to divert the water away from the working site, by drying out small areas bit by bit, a process that took place until construction was possible above water level.

Engineer:  Carshif Talip of Aurecon Main Contractor:  Colin Budge of Burger and Wallace Construction Contractor:  Decorton Retaining Systems
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