To advertise in this section contact Classifieds
Peter Britton on 01747 855335 email:
peter@pitchcare.com
SPORTS TURF CONTRACTORS
DRAINING 25 years experience in sports turf aeration
WORTH
Overseeding - Sanding Top Dressing Hollow Coring
Consultancy, Management & Renovation of Sports Surfaces
Winter Pitch renovation BLEC Groundbreaker and Sandmaster attachment Koro Field Topmaker
Midlands & North Wales
Mobile: 07779 333010 Tel: 01889 567449
www.vitalturfmanagement.co.uk Email:
lee@vitalturfmanagement.co.uk
Advertising in this classified section costs as little as £200 a year
Tel/Fax 01476 550266 Mobile: 07855 431119/20
email:
bloodworth@onetel.com www.worth-d
draining.com Blec Groundbreaker Verti draining
Drainage
The use of PERMEABLE MATERIALS
THE use of permeable backfill over subsurface drains is essential in all sportsfield applications. The function of the backfill is to provide a free draining connection between the upper soil layers and the drains. The material used should be suitably sized permeable backfill. Design should ensure that the permeable backfill extends sufficiently near to the surface to intercept any secondary treatment and to ensure adequate water entry into the drains. Secondary treatments, other than for maintenance should not be specified unless an adequate drainage system with permeable backfill is already in place.
The design depth from the
surface to the permeable backfill may vary but should be at least a minimum depth of 100mm from the playing surface. Care should be taken to ensure that injury does not occur due to gravel or stone backfill material extending to the surface.
The choice of material for SPORTS TURF CONSULTANTS
Total Turf Solutions One resource for all your turf care needs
The tts culture is based on its independence.
tts embodies a new generation of turf consultants combining experienced and practical groundsmen with in-depth technical knowledge.
For more information on how tts can improve your playing surfaces and contribute effective resource management to your organisation, don’t hesitate to call.
Telephone: 01604 750555 Mobile: 07973 885 775 Website:
www.totalturfsolutions.co.uk email:
enquiry@totalturfsolutions.co.uk
SWEEPERS KERSTENSWEEPERS
We offer the largest and most comprehensive range of pedestrian hydraulic propelled equipment and sweeping attachments
SALES • SERVICE • PARTS Kersten (UK) Ltd. Reading RG7 3AH
Tel 0118 9834337 Fax 0118 9834512
info@kersten-machines.com
www.kersten-machines.com
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96
It is imperative that the sand or sand/soil mix used is of the correct particle size to prevent migration into the granular backfill. Where this is not the case a blinding layer should be used to prevent any such migration. For example, a fine sand or sand/soil mix used over
TRIMMERS
topping up permeable (gravel) backfill is extremely important. Advice on the most suitable material should be sought from suppliers, consultants, and contractors.
Selection of permeable backfill
materials is of utmost importance. All backfill material placed over drains or in secondary treatments, should be clean, durable and free from dust, lime, and chemical or other pollutants.
Granular Backfill
The backfill material placed over drains should be clean, washed aggregate, shingle or other suitable stone. Good quality artificial material, such as Lytag, may be used in certain applications. Recycled material may be utilised provided it conforms to the specification below. The material should have a
narrow particle size range. The recommended limits for drains in grass pitches topped with sand are 5mm - 10mm.
Sand Backfill
5-10mm granular backfill is likely to require a blinding layer of 50mm depth. For fuller details of sand type selection and use see the accompanying chart. Note should be taken of what sand is available locally and, if in doubt, advice should be sought on its suitability.
Backfilling with Permeable Fill
Suitable permeable backfill must be placed over the drains to the required depth. Any loose soil or other material on the pipe should be removed and soil should not be permitted to mix with the fill material. Aggregate or sand hoppers are recommended so as to regulate the depth of the backfill and to minimise spillage and prevent soil ingress.
The backfill must be placed in such a manner as to avoid damage to, or displacement of, the pipes. Backfilling over subsurface drains should normally extend to within 100mm to 150mm or so of the surface as to intercept the topsoil layer. The final 100mm of backfill should be a suitable sand, rootzone, soil or turf, depending on the application. Where slitting, banding or other secondary treatment is specified, the permeable backfill over the subsurface drains must interconnect with that treatment. Catchwater or French drains, such as those beside all-weather surfaces, should have permeable backfill to the surface. In some cases, the final 50mm may be sand. Care should be taken when backfilling to keep the stone backfill free of soil. Note: Settlement of the backfill
often occurs. Usually it is due to shrinkage of the clay fraction of the soil as a result of the drier soil regime. It can be severe in periods of prolonged drought in the early years. Once settlement has occurred, remediation measures are limited to topping up. On intensive schemes, general sand or root zone top dressing may be an option but deep settlement will require specific application to individual trench lines by means of specialist equipment. Subsequent maintenance may be required.
SECONDARY DRAINAGE TREATMENTS
A secondary treatment is regarded here as any treatment placed over a primary piped
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