Aquaflow Water Harvesting System

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1 FM Formpave Water Harvesting System Available in Formpave EcoGranite

2 Water Harvesting System Water Harvesting System with safe and clean water Beat the Hosepipe Ban Water the Garden Wash the Car and recycle the water Please look at our web-site for more information including a full list of Hanson Formpave stockists: Formpave Over the past 15 years the 'Hanson Formpave ' 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 then 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. 7 Coleford, England, UK. The Aquasett and block is available in Formpave EcoGranite, an environmental alternative to the use of freshly quarried granite. Formpave's unique granite mix includes both Stent and Slag; by-products of Cornish China Clay and the South Wales steel industry. 1

3 Water Harvesting System Situated at Coleford in the Royal Forest of Dean, the Hanson Formpave works is one of the most sophisticated of its type in Europe. The technology used in the works and the Company's quality assurance scheme provides complete works traceability of every block made. The works has BS EN ISO 9001: 0 Quality Assurance accreditation and is a BSI registered company. If you would like information on 's other products please visit our web site: or call our Sales office on The Water Harvesting system collects water from all impermeable surfaces, roofs, paths and especially the driveway. All water falling onto the paved surface is cleaned by the Inbitex geotextile layer before storage. Recommended uses for this water are garden watering and car washing; these uses can reduce by up to 50% the household requirements for mains water. The system involves linking the roofs and paths through the permeable pavement (the drive) and into the voided sub-base. The rainfall (run-off) is stored within this 'reservoir' area with all surplus being discharged into a sump. The sump contains a pump which will allow the harvested water to be dispensed via a tap and hose-pipe. Rainwater tanks should be sized to provide a continuous supply between rainfalls, typically days. Because there is no mains water attachment the harvested water can be used where there are hose pipe restrictions as the tank is treated as a subterranean water butt. Car washing becomes an environmentally friendly pursuit as the majority of the water used will automatically be cleaned and recycled as it passes through the permeable paving on the driveway. The capacity of the system is dependant on the size of driveway, but additional storage can be achieved by increasing the pump chamber (sump) size. It will be necessary to calculate the approximate quantities of water required set against the estimated quantity of rainfall. This can be done using average rainfall figures. mm 80/ Incoming pipework from roofwater drainage Concrete haunching face on all haunching must be shovel smooth 300 or 500mm diameter silt trap with 350mm minimum sump Standard kerb block blocks/slabs Membrane sealed with Formpave top hat seal where pipe passes through 2-6mm clean stone * Distribution tank with geotextile surround on 10mm pipe bedding Upper sub-base 5-20mm stone SC intergrid * Optional SC intergrid * * Lower sub-base 10-63mm stone * Inbitex * SC membrane Hydraway fin drain overflow connected to 110mm PVC-U pipe with Formpave top hat seal * Schematic pump chamber See specifications For further information contact: WTB Geotextiles * 3

4 Construction Sub-Base specification Colours and finishes Pack sizes, weights and Maintenance Formpave kerb options Charcoal and Aquaslab Burnt Red and Aquaslab Aggregates are available through: Hanson Aggregates for further information phone Formpave sales office Geotextiles are available through: telephone fax Geosynthetics Limited telephone fax For further information contact: WTB Geotextiles Sub-grade Excavate to sub-grade appropriate levels shown on site drawings to provide a minimum fall of 1:0 to fin drain. The sub grade should be compacted with a vibrating plate. Prior to compaction all soft areas should be removed and filled with suitable replacement material to provide a stable sub-grade. Kerbs/edgings The paved areas must be firmly restrained. The kerb edging must extend with sufficient height above the haunching to accommodate the full laying course depth and block height. SC membrane The SC membrane must be water tight therefore a taped joint may be insufficient. To ensure the integrity of the membrane the joints should be fully welded, this can be completed on site or pre-formed off site and delivered ready for installation. Sub-base The lower layer of subbase (10-63mm) should be placed in 2 separate layers, each layer being compacted with a vibrating plate. SC Intergrid Where required the Intergrid should be incorporated at the interface between the two layers of sub-base. The Intergrid should be laid on the sub-base and joints should be overlapped by 300mm. The upper sub-base layer (5-20mm) should then be laid on top of the Intergrid and compacted as before. Inbitex Lay geotextile on top of the sub-base overlapping joints by 300mm. Inbitex should be brought up to the haunched kerb/edging and cut-off flush with the surface of the paving. Laying course Lay and screed to level approximately 50mm depth of 2-6mm single sized crushed stone to BS EN 13242: 2. It is important that the final level of the 2-6mm stone is accurate as the stone will compact down much less than sand when the surface blocks are vibrated. The particle shape of the 2-6mm stone will also affect the degree of compaction. It is recommended that a small trial area should be laid prior to construction to determine the accuracy of final levels. Block laying It is advisable to pre-set the block level by 6mm to allow for the effects of settlement when laid against fixed edgings. The blocks and slabs must be tightly butt jointed ensuring that a good fit is achieved. A single or double stretcher course of blocks must be used around the periphery of the paved areas and also at the edges of any separately restrained areas, such as tree pits. Where blocks need cutting, they should be cut to a tight fit and none are to be smaller than 30% of the unit block size. Blocks should be cut vertically and not underscored. All block cutting should be carried out with a disc cutter. Surface finish The blocks should be vibrated with a vibrating plate. Following the first pass with a vibrating plate, the tapers and slots should be totally filled with 2-4mm clean quartzite. (Available from Formpave in 25 kg bags). Blocks should again be vibrated and any debris brushed off. Pump Chamber (Sump) The sump is connected to the system at the fin drain. Excavation A hole is dug to the dimensions of the pump chamber. This is lined with an impermeable membrane, it can be taped using double sided tape but for total integrity it is recommended that a welded membrane is used. The pump chamber is then placed within the membrane. The pump is inserted and connected to the mains. The chamber is then wrapped in the membrane and covered with soil. The soil is compacted to make a firm surface. The laying course should be 50mm of 2-6mm clean crushed stone. All granular sub base must comprise Crushed gravel or rock possessing well defined edges. The mm deep upper layer of sub-base material should be graded 5-20mm to BS EN 13242: 2. Grading of lower layer of subbase stone: BS EN Sieve size % passing 80mm 63mm 90-40mm mm mm 0-5 Inbitex Thermally bonded non woven geotextile. Membrane An impermeable membrane at formation level. Fin Drain Hydraway Fin Drain 300mm High. Colour and finish variation products are manufactured from naturally occurring materials and consequently may show slight variations in finish and colour. It is strongly recommended that products are taken from two or more packs and mixed during laying to minimise any colour variation. All concrete products may suffer from efflorescence. This occurs naturally and will disappear with use. It is in no way detrimental to the performance of the product. No responsibility can be accepted for this natural reaction. Finish blocks and Aquaslab are manufactured with a standard finish. Aquasett and Aquasett combined are manufactured with an olden finish., Aquaslab and Aquasett are also available to special order in Formpave EcoGranite. Standard finish Olden finish EcoGranite to special order Formpave EcoGranite is an environmental alternative to freshly quarried granite. It uses Stent a by product of the China Clay industry and Ground blast furnace slag a by product of the Steel Industry. Golden Brindle and Aquaslab Natural and Aquaslab Red Brindle, Aquasett and Aquaslab Traditional Aquasett Vendage Aquasett Pennant Aquasett EcoGranite Aquasett, and Aquaslab Pack sizes and weights All packs are palletised and shrink wrapped with the exception of the block which is Void packed. 60mm Aquaslab 11.34m 2 per pack, 84 blocks in 14 layers. Weight approximately 1.49 tonnes per pack. 60mm Aquasett 10.5m 2 per pack, 280 blocks in 14 layers. Weight approximately 1.38 tonnes per pack. 60mm Aquasett combined 11.2m 2 per pack, 434 blocks in 14 layers. Weight approximately 1.47 tonnes per pack. 60mm block 8.48m 2 per pack, 424 blocks in 14 layers. Weight approximately 1.10 tonnes per pack. Maintenance The surface blocks have a design life equivalent to standard block paving. The surface blocks require routine maintenance and the surface should be brushed at least twice a year. It is recommended that this should be carried out in the spring and after leaf fall in autumn. Following routine maintenance it may be necessary to re-dress the surface with 4-2mm clean gritstone. Ultimately, perhaps after 25 years or more, areas of the laying course may become filled with silts and toxins. If this occurs the surface blocks should be uplifted and the affected areas of laying course material and geotextile disposed of. The existing subbase can be left insitu. Fresh geotextile and laying course stone should be installed and the existing surface blocks re-used. The range of kerb options together with the full range of Formpave concrete paving products are illustrated in greater detail in the standard Formpave manual available on request. Standard kerb system The range consists of fifteen blocks to facilitate edge restraint, cornering, cross-over, and transition radius EcoGranite kerb Bush hammered finish. Forest edging A substantial edge restraint also used for lateral strength in pavement design.

5 Tufthorn Avenue Coleford Gloucestershire GL16 8PR tel fax Hanson Plc a Global Business Hanson is one of the world's largest suppliers of heavy building materials to the construction industry, with a turnover in 6 of 4.1bn. Our products fall into two categories: Aggregates (crushed rock, sand and gravel, ready-mix concrete, asphalt and cement related products) and Building Products (clay bricks, precast products and concrete pavers, blocks, tiles and pipes). We employ 26,000 people, operating primarily in North America, the UK and Australia with further operations in Asia Pacific and Continental Europe. Hanson Building Products UK incorporates London Brick, Thermalite, Red Bank, Cradley and Formpave. Printed on Hello Matt using totally chlorine Free (TCF) pulps from sustainable forests. Design Tony Baldaro FSCD Colour reproduction Every care has been taken to reproduce the colour of the blocks in this brochure as accurately as possible. However, we cannot guarantee the exact colour reproduction. FM 12515