THE PROBLEM
A tanked drainage system was required for the business park’s paved areas due to the site geology and previous land uses where a capping layer has been provided.
THE SOLUTION
Hanson Formpave's® Aquaflow® permeable paving system is a sustainable urban drainage system (SUDS). The Aquaflow system prevents run-off and flooding from paved areas, and collects and filters storm water for later use or controlled discharge. The patented system allows rain to infiltrate through a permeable block paving surface into a porous sub-base which is mechanically stabilised by Tensar geogrids. The mechanically stabilised layer helps mitigate differential settlement and increases the bearing capacity of this pavement system.
PROJECT DESCRIPTION
Increasing urbanisation and rapid run-off have put a tremendous strain on conventional storm water drainage systems. This has resulted in sewers and culverts becoming overloaded during periods of heavy rain and contamination of streams and rivers. Secondly, heavy metals, hydrocarbons, rubber dust, silts and other detritus are all deposited on impermeable surfaces during dry weather. These are scoured off such surfaces during periods of heavy rain and transported at best into expensive treatment works or directly into rivers and streams where they cause severe environmental damage.
A tanked drainage system was required for the business park’s paved areas due to the site geology and previous land uses as the site had been capped and up-filled. The Hanson Formpave system allows infiltration of rainwater into a storage system formed by sub base aggregate which is reinforced as a mechanically stabilised layer using one or more layers of Tensar SC Intergrid.
Business Development Manager for Hanson Formpave, Steve Spikes’ commented: “Tensar geogrids stabilise the aggregate layer by ensuring that individual stone particles are firmly interlocked within the geogrid apertures. This builds up the level of support and increases load transfer which ensures that the aggregate is confined during initial compaction and subsequent loading. Extensive full scale testing and long term monitoring of live projects has provided us with evidence to substantiate the unique advantages where a geogrid is included within our systems make up”.
