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Category: Formpave Aquaflow Stormwater Source Control System Water Harvesting

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Formpave
Stormwater Source Control System

Aquaflow Permeable Paving & Stormwater Source Control System

In 2002 Formpave Ltd were awarded the Queen’s Award for Enterprise, in the innovation category, for their patented Stormwater Source Control System and Aquaflow range of Permeable Paving. With over 900 completed sites in the UK, the system is over 12 years old and has BBA certification.

Sustainable Urban Drainage Systems (SUDS) are increasingly being used to prevent run-off and flooding, and as a method of collecting and cleaning storm water.

Sustainable Urban Drainage Systems

Aquaflow Paving

Size: As per manufacturer’s specification.

Colours: Red Brindle, Golden Brindle, Natural, Charcoal, Burnt Red. Aquasett available in Red Brindle, Vendage, Traditional and Pennant.

Setting Out: Aquaslab: Staggered stretcher bond with double stretcher course around all perimeters. Aquasett: Staggered stretcher bond or 90º herringbone with double stretcher course around all perimeters. Aquasett Combined: Staggered stretcher bond with double stretcher course around all perimeters. Aquaflow Block: 90º herringbone with double stretcher course around all perimeters. Aquaflow ML: Include stretcher course around edge in conjunction with MLE and MLTB.

Kerbs: Standard kerb system or Forest Edging: both to be haunched with concrete.

Laying Course*: 50mm depth of 2-6mm, single size clean crushed stone to BS EN 13242: 2002.

Inbitex: As specification.

Sub-Base Specification: All granular sub-base material shall comprise crushed gravel, rock or concrete possessing well defined edges. It must be sound, clean, non friable and free from clay or other deleterious matter. The material must not be plastic when tested in accordance with BS 1377 Test No. 4. The crushed stone used for the laying course and sub-base must have a minimum 10% fines value of 150kN when tested in accordance with BS 812 Part 111. The selected test samples shall not be oven dried and should be soaked in water at room temperature for 48 hours before the test. The 100mm deep upper layer of sub-base material should be graded 5-20mm to BS EN 13242: 2002.

Depth of Sub-Base: It is recommended that a sub-base of 350mm should be used. The depth of sub-base may be varied at the discretion of the Engineer. Alternatively 270mm of sub-base overlaid with 80mm of dense bitumen base course to clause 903 of the Highways Agency Specification may be used.

Intergrid: SC Intergrid.

DBM Running Course: To be 20mm dense base binder course manufactured with 100/150 grade bitumen to BS 4987. The DBM shall conform with the requirements of BS 4987.

Membrane: Generally a taped membrane will be suitable for most applications of the tanked system. If a guaranteed watertight system is required a fully welded system should be installed. Examples of this type of application would be sites with a high water table, methane contamination, areas above basements or retaining walls. Further advice should be sought from the Hanson Formpave design team.

Fin Drain: 300mm Hydraway Fin Drain to BBA Number 95/85.

Seal: Formpave top hat seal.

Sub-Grade: Where the structure is to be over-run by heavy vehicles the sub-grade should have, or be improved to have, a CBR of at least 15%. Poor sub-grades with low CBRs may be improved by incorporating a capping layer of cement, lime or bituminous bound materials. Alternatively granular materials in accordance with clause 613 of the Highways Agency specification may be used.

Paving sub-base layering guide
Grading of lower layer of Sub-base stone

Aquaflor paving laying guidelines

Water Harvesting

Over the past 15 years the ‘Hanson Formpave Aquaflow’ system has become the flagship design for permeable paving.

The unique sub-base cleans pollutants from run-off, creating a safe, PH neutral water for storage and re-use within the sub-base. Water can be captured from all impermeable areas; roofs, paths and driveways.

It can be further stored in a tank and them pumped out for all exterior uses; gardens and car washing.

Because cars are washed on the driveway and the driveway is permeable, even this water is recycled.

Tanked Permeable paving systems

Roof Water

Roof water can be discharged in to the sub-base. With gravity fed drainage it is recommended that the water is introduced into the sub-base by means of a sump with a manhole cover adjacent to the paved area. Any debris can be easily caught and cleared. The water is then dispersed within the system via a distribution tank.

Geothermal Heating & Cooling

Hanson-Formpave presents a pavement-based system capable of reducing a building’s reliance on gas or electricity for heating and cooling by up to 80%.

A patented system for heat capture from stored water can be used to generate 6 kilowatts of energy for indoor climate control. A heat pump moves the heated or cooled water through either underfloor heating or radiators.

The payback period on the system is typically between 3 and 6 years after which, other than the cost of running the heat pump, heating and cooling costs are completely removed.

Geothermal heating cooling paving

Hanson Formpave’s Free Design Service

Hanson Formpave offers a comprehensive free design service to suit individual site requirements. The service offered by Hanson Formpave’s team of engineers includes technical and professional advice, preparation of draft proposals and validation of client’s own designs.

All designs are covered by Hanson Formpave’s professional indemnity insurance, and benefit from the company’s 12 years experience in designing.

With over 900 completed sites in the UK and licencees around the world, Hanson Formpave’s ongoing program of research and development is helping to establish the next generation of permeable paving systems.

Information associated with: Formpave - Concrete Paving Blocks, Kerbs, Setts & Cobbles

 

 

Stormwater permeable paving system

Email this company

Hanson Building Products
t/a Hanson Formpave
Tufthorn Avenue
Coleford
Gloucestershire
GL16 8PR

Tel: 01594 836999
Fax: 01594 810577

Water permeable paving setts
 

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