On-going trials at Coventry University
are demonstrating that within a TarmacDry porous
asphalt system microbes develop naturally in response to
ongoing contamination. The microbes are able to treat and trap the
contaminants and this capability is further enhanced by filtration
and aeration within the construction. TarmacDry pervious pavements
also limit the concentration of pollutants by immediate localised
interception and long term research has demonstrated that the
following are effectively removed from stormwater run off:
• Heavy metals
• Hydrocarbons
• Phosphorus
• Nitrogen
Hence TarmacDry systems can minimise the need for costly
traditional petrol/oil interceptors and can be used as a primary
treatment facility in accordance with best practice guidance e.g.
CIRIA C697 'The SuDS Manual', usually without the need for further
treatment. For more information on the SuDS manual see the CIRIA website.
"As a result of testing work carried out by Coventry
University on behalf of Tarmac throughout 2007, we conclude that in
comparison with other surfaces tested and using a uniform approach,
the TarmacDry Pervious Paving System, including asphalt and
concrete surfaces, performed as well as any of the other surfaces
tested. In particular its performance in terms of hydraulic
conductivity ( flow rates ) and water cleansing was comparable with
block paving with no discernable difference between the
two."
Dr Sue Charlesworth
SuDS Applied Research Group
Coventry University
See Coventry
University SuDS website
See the new downloads with testing
results from Coventry university here - downloads
