40 FLOOD CONTROL & SUDS; FLOORS & FLOOR COVERINGS
with a secondary seal. This not only helps meet the BS EN 1433 water tightness requirements, but allows further construction work to be undertaken right away, safe in the knowledge it is not likely to pose a contamination risk to the land in question.
PRODUCTS IN PRACTICE
There are a number of applications where specifying a fully-sealed system can contribute to an effective remediation of a brownfield site, both during and post-construction. Given that effective surface water management must be considered from the start of the planning process, specifying a system with an integrated seal for use as a temporary fixture during the construction phase can provide developers with instant control over surface water from the outset of the remediation process.
An integrated seal promotes quick and
effective installation times as contractors do not have to manually seal each junction
Any surface water run-off from the construction site can then be contained within the sealed system, before being collected at predetermined points, and cleaned using specialist rainwater and surface water run-off filtration systems. Crucially, the system can then be removed if necessary, or incorporated into wider post-construction drainage infrastructure. When repurposing brownfield land, a key post-construction challenge for developers is to demonstrate the long-standing efficacy of the water management system, so that the substrate remains free from any potential contamination.
Heavily-trafficked areas are of particular concern. Surface water run-off in areas such as car parks and high streets can be subjected to a number of potential contaminants, including heavy metals, tyre wear, brake dust, soots and sediments, as well as de-icing products during winter months. It is crucial that surface water which has the potential to come into contact with any contaminants is fully
contained within the drainage system as, for example, chlorides present in road salt can lead to the potential weakening of concrete foundations if they are able to egress into the substrate.
CONCLUSIONS
Given the land availability crisis facing the UK construction industry, coupled with Government changes to planning documents, developers will soon find themselves in a position where repurposing brownfield land is the only viable option. Surface water is major contamination risk for the surrounding substrate in brownfield sites, and given the volume of testing and risk assessments that must be undertaken, managing it effectively could determine whether or not a planning submission is successful.
Specification can play a pivotal role in satisfying a number of the water management planning criteria. By incorporating a drainage system with an integrated seal into brownfield specification, developers can take full control of surface water management, and overcome one of the biggest planning permission challenges out there.
Will Allen is marketing manager (Civils + Infrastructure) at ACO Water Management
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