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44 GROUND REINFORCEMENT; GROUNDWORKS & SEWAGE TREATMENT


concrete block permeable paving and eliminates any sewer connections. Where a comprehensive SuDS scheme is planned to incorporate landscape features, concrete block permeable paving removes water-borne pollution and provides a gradual flow of clean water at the head of the ‘management train’. Surface water in open SuDS features can then be used to enhance landscape design and biodiversity.


LOW-COST DRAINAGE


Following some 25 years of use in the UK and abroad, concrete block permeable paving has proved to be a predictable, reliable and low-cost SuDS technique. Its capability to attenuate water flow during rainfall for gradual discharge is well known. But, this principle is optimised for greater cost efficiency by considering distinct storage ‘compartments’ of permeable paving using straightforward flow control devices with an orifice (accessible for observation and adjustment if needed) on the outlet.


This technique enables water storage to be strategically deployed around a develop- ment within permeable paving compartments, each with a flow control demonstrating compliance to local authorities as part of the SuDS design approval process. It maximises the


potential for water to be stored onsite, beneath paving that is needed anyway. This avoids dedicated water storage structures on valuable land, as well as their associated excavation and construction costs.


Similar techniques maximise storage in permeable paving on sloping sites, using terraces of compartments separated by simple check dams that incorporate flow controls. Flow controls can also be used to retain water and make the most of available infiltration, in turn reducing discharge.


GREENFIELD RUNOFF RATES A recent example of SuDS applied to a typical new housing scheme is Fleetwood Crescent – the 28-home first phase of a new development in Peterborough. It makes extensive use of concrete block permeable paving, reflecting Peterborough City Council’s desire to incorporate SuDS in its developments. The permeable estate road will be adopted under the ‘Section 38’ process and is a trial project, with its performance being monitored. The drainage is designed to temporarily store rainwater runoff onsite and remove pollutants before gradually discharging to an existing surface water sewer that outfalls into a nearby watercourse. Water discharge from the development via the permeable


paving is restricted to ‘greenfield’ runoff rates by an orifice flow control chamber. Surface water storage volumes on the site are designed to cater for rainfall events exceeding the one in 100 year storm plus 30 per cent allowance for climate change. Un-adopted driveways next to dwellings and shared parking areas are also concrete block permeable paving, linked to the permeable road construction with pipes below the footpath. Rainwater from all roofs drains into the driveway permeable paving. Services are generally accommo- dated in ‘corridors’ within the footpaths, with an impermeable block paved road crossing.


KERB APPEAL Of course, paved surfaces help to define the character of any development. The growing choice of concrete block permeable paving products available, with numerous shapes, styles, finishes and colours, allows for freedom of design. At the same time, permeable paving can provide a completely level, well-drained, firm and slip-resistant surface accessible to all, without the need for cross-falls, channels, gulleys or other interruptions. Rainwater ‘ponding’ is elimi- nated, reducing the risk of ice forming on the surface and preventing splashing from standing water.


Enq. 142


Resin bound Seagull crest by Clearstone


A giant resin bound Seagull crest welcomes B&H Albion football fans to the Amex stadium in Brighton. Paul Barber, Chief Executive of the Albion noticed a crest (albeit on a much smaller scale) at Manchester City and liked the idea and decided the club should have their own, but bigger and bolder to create a real sense of arrival for the fans. Clearstone Paving Ltd was chosen for the project as they are a specialist resin bound surfacing company with expertise in producing custom paved logos. The crest was created in Vectorworks CAD program, from which intricate templates were laser cut for the seagull, its beak and the lettering, which were then carefully pinned in place by Clearstone’s installation team. Then in-filled with white and blue RAL coloured pigmented quartz to match the team's home kit colours. Finally a seal coat of resin was sprayed on the crest and anti-slip glass sand was applied as a finish. It took around eight days to complete.


Enq. 143 WWW.HBDONLINE.CO.UK 01273 358177 www.clearstonepaving.co.uk 144


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