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.
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.
Grading of lower layer of Sub-base stone
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.
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.
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
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Hanson Building Products
t/a Hanson Formpave
Tufthorn Avenue
Coleford
Gloucestershire
GL16 8PR
Tel: 01594 836999
Fax: 01594 810577
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