Aquaflow SuDS technical specifications
Standard contract documentation to be read with preliminaries/general conditions.
Q24 SUSTAINABLE URBAN DRAINAGE SYSTEM
115 TYPE(S) OF PAVING
Permeable concrete block paving
Tufthorn Avenue, Coleford
Gloucestershire, GL16 8PR
t 01594 836999
f 01594 810577
Aquaflow, Aquasett, Aquasett combined, Aquaslab, and Aquaflow ML, MLE, MLTB.
As per manufacturer's specification
Natural, Burnt red, Red brindle, Golden brindle and Charcoal. Aquasett available in Traditional, Red brindle, Vendage and Pennant.
All products available in EcoGranite except Aquaflow ML, MLE, MLTB.
Aquaflow and Aquapave blocks: recommended 90° herringbone with double stretcher course around all perimeters.
Aquasett: Staggered stretcher bond or 90° herringbone with double stretcher course around all perimeters.
Aquasett combined: Staggered stretcher bond with double stretcher course around all perimeters.
Aquaslab: Staggered stretcher bond with double stretcher course around all perimeters.
Aquaflow ML: Include stretcher course around edge in conjunction with MLE and MLTB.
Standard kerb system or Forest Edging: both to be haunched with concrete.
50mm depth of 2-6mm size clean crushed stone to BS EN 13242: 2002.
All granular sub-base material shall comprise crushed clean stone, rock or concrete possessing well defined edges. It must be sound, clean, non friable and free from clay or other deleterious matter.
Sub-base specification* contd*
The material must be non plastic when tested in accordance with BS1377 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 BS812
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 5mm-20mm to BS EN 13242: 2002.
Grading of lower layer of sub-base stone:
BS EN Sieve size % passing
Depth of Sub-base
It is recommended that a subbase depth of 350mm should be used. The depth of sub-base may be varied at the discretion of the Engineer. Alternatively for an adoptable road scheme use a 450mm sub-base with a 80mm dense bitumen base course to Clause 903 of the Highways Agency specification.
SC Intergrid geogrid
DBM Running Course
To be 20mm dense base binder course manufactured with 100/150 grade bitumen to BS4987. The DBM shall conform with the requirements of BS 4987.
SC Membrane geomembrane
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 geomembrane application would be geothermal projects, sites with a high water table, methane contamination and areas above basements or retaining walls. Further advice should be sought from the Formpave design team.
300mm SC Fin Drain to BBA Number 95/85.
Formpave top hat seal
Where the structure is to be over-run by heavy vehicles the subgrade should have, or be improved to have, a CBR of at least 15%.
Poor sub-grades with low CBR's 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.