Finesse Fildrain is a geocomposite drainage system which used for a wide range of applications in highways and civil engineering projects with significant cost and timesaving advantages over traditional drainage solutions. Fildrain is used to replace conventional wide width stone drainage systems which are costly and damaging to the environment as large quantities of stone have to be quarried and transported to site. Excavated material is in many situations sent to landfill, Fildrain allows arisings to be used as backfill saving on landfill tax and transport costs.
Fildrain is a composite system consisting of a dimpled HDPE core and a filter geotextile. The Fildrain works by creating open voids through which water can flow and be channelled to a carrier pipe and transported to a suitable outlet or soak-away. ABG’s 7mm range of double cuspated cores allow drainage to both sides of the Fildrain, which has the advantage of offering sub-base and cut off drainage as well as a high flow rate of 1.2 l/m/sec at HG 1.0 and 20kPa.
Fildrain is manufactured in thicknesses ranging from 4mm up to 25mm with flow rates ranging from 0.95 l/m sec for our 4mm system up to 12 l/m sec for our 25mm system ensuring suitability for even the most demanding applications. Traditional French drains using Type A filter stone at .6m widths have a flow rate of approx 0.12 l/sec, this is due to stone interlock reducing available flow passages.
Applications and benefits
Highway edge drainage
Fildrain can be used to drain both surface and sub-surface water. Fildrain is manufactured to meet the requirements of DTP clause 514 for Findrains Type 5, Type 6 and Type 7 as shown on HCD figure F18.
Under channel drainage
Fildrain is be used to drain the underside of concrete and grassed channels, Fildrain meets DTP requirements for Type 10 fin drains as shown on HCD figure F21
Embankment drainage and consolidation
Fildrain is used to replace granular starter layers layers and consolidation layers which are typically installed at 1 – 2m centres within embankments. Fildrain 7DSS is used for these applications and has the advantage of providing drainage on two sides.
Verge, toe and batter drains
Fildrain completely removes the need for drainage stone and offers considerable advantages in terms of site access and installation of the drainage system in often difficult and complex drainage configurations.
Cut off drains
Fildrain has a impermeable central core so provides an effective cut off drain. This is especially beneficial when it is desirable to prevent water infiltration to highway sub-bases from surrounding land.
Benefits
Cost effective
Fildrain systems reduce or eliminate the need for drainage stone, in many situations excavated material is re-used as backfill (as per DTP clause 514 part 9). Type 8 and 9 findrains require considerable quantities of stone and offer drastically reduced performance compared to types 5 – 7.
Rapid installation
Fildrain is easily and rapidly installed compared to traditional drainage systems. Fildrain is available in a wide variety of configurations some of which incorporate the use of a carrier pipe whilst others use flow along the Fildrain core.
Sustainable development
Fildrain reduces or eliminates the need for quarried materials and in most situations enable as dug materials to be used as backfill to the Fildrain. This is a significant advantage as spoil is re-used removing the need to landfill arisings. Fildrain requires only a narrow trench – typically 100mm wider than the carrier pipe this reduces the overall land take requirement and can remove problems associated with services running in verges.
Access
Access and haulage through often lengthy sites can present a significant problem, one single load of Fildrain is equivalent to approx 100 loads of drainage stone. Added advantages are reduced disturbance to local residents, lower exhaust emissions and reduced congestion.
Associated Products ABG manufacture a wide range of complimentary materials: Deckdrain – structural drainage system Erosaweb – geocellular containment system used for erosion control and verge protection Erosamat – a wide range of bio degradable and permanent erosion control system Webwall – retaining wall system allowing re – use of site won materials Rotaflex and Rotagrid – pavement reinforcement systems for use within bituminous layers for crack prevention. Abgrid, Trigrid, Abtex and Terrex – an extensive range of Geogrids and geotextiles for use as strengthening and separation layers. Dekotex – cost effective orange grid used in lieu of red asphalt indicator layers on bridge decks
Landfill
Geotextiles
Structural
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Cavity
Erosion
Asphalt
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