Technical
even modest cut slopes. Where secondary drainage is to be installed, this crossfall gradient can be reduced to 1:70. Expectedly, there must be adequate collection of water run-off from cut slopes above the pitches.
2. Cambered pitch
Where the existing topography is relatively level, the establishment of a camber reduces the excavation needed. In creating side slopes of 1:60 with a central convex camber, there is notable water run-off to the sides of the pitch. The installation of swale drains beyond the touchline convey this surplus water to an approved outfall.
In shedding water to the sides, the distance covered to each side is scarcely 35m and the significant cross gradient to each side ensures, too, that puddles are not formed. This form of grading the pitch, in shedding surface water rapidly, makes it less necessary to install secondary drainage - especially on school and lower level pitches in local authorities.
Drainage
The drainage provisions determine, in most cases, the success or failure of the pitch. Installing secondary slit drains is a costly undertaking and there is the added expense of annual sand dressings. Most local authority and school pitches cannot afford this undertaking and efforts must be concentrated on securing good crossfall gradient and preventing water run-off on the pitches.
Where cancellation of matches due to waterlogged conditions is not acceptable, the only option is to firstly ensure there are consistent satisfactory gradients and then install close-spaced slit drains that are properly maintained - especially with the annual application of sand dressing.
Gordon Jaaback, Agronomist & Project Manager Email:
gordonjbk@turfandgrass.com Website:
www.turfandgrass.com
Cambered pitch at Hadlow College
Swale drainage is very effective on either side of a cambered pitch
SANDBANDER
For excellent secondary drainage. Fast, easy installation of sand slits from 25mm to 40mm (1" to 1.5") to a depth of 250mm (10").
AFT Trenchers Limited T: 01787 311811
E:
info@trenchers.co.uk www.trenchers.co.uk
PC AUGUST/SEPTEMBER 2015 I 131
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