Bespoke Design
Each TarmacDry porous pavement installation is of bespoke design and is tailored to meet the specific requirements of your site. Tarmac will design, install and maintain a highly engineered system capable of storing varying amounts of rainwater to permit managed release or re-use as grey water.
See installation of The Foundary at Leicester in the video below:
Tarmac Factoid
The TarmacDry asphalt base was originally developed for use as a flood barrier in East Anglia.
There are 3 primary forms of TarmacDry design to meet specific SuDS requirements:
- Infiltration - it is recognised that total infiltration is generally the preferred design option and should be utilised as source control wherever possible.
- Partial Infiltration - this option is being increasingly used on low permeability sites where a proportion of the run-off is drained through infiltration and the remainder is discharged into an appropriate outfall.
- Attenuation - this assumes no infiltration and utilises an impermeable geomembrane to achieve temporary storage prior to controlled discharge or re-use.
In addition the following design considerations can be catered
for:
- Rainwater re-use - TarmacDry systems can be utilised for harvesting rainwater with the sub-base creating a storage tank prior to re-use for a range of non-potable applications including toilet flushing and irrigation.
- Sloping sites - TarmacDry systems can be successfully installed on sloping sites - dependent upon the gradients it may be necessary to construct dams/baffles within the sub-base layer to control the flow of water.
- SuDS and brownfield sites - a common misconception is that SuDS cannot be used on contaminated sites. In fact, appropriately designed TarmacDry paving systems can be successfully incorporated into any brownfield development and can offer many advantages over conventional drainage solutions. A primary benefit is that the shallow construction minimizes the amount of contaminated spoil that needs to be disposed off site.
- SuDS retro-fit to existing development - SuDS can also be used very effectively to overcome drainage problems on existing developments. TarmacDry can provide a cost-effective solution without increasing land-take requirements. In certain circumstances use of a TarmacDry SuDS system could make available for development land which is currently steralised by conventional drainage requirements.
Bespoke design service
Tarmac offer a bespoke design service for the creation of innovative cost effective pervious pavement solutions in accordance with best practice guidance. This unique design service is based upon the completion of a Consultancy Services Request Form which provides the necessary project specific information to enable the optimum designed solution to be created in terms of performance, buildability and cost.
