Technical
Shelton’s gravel bander in operation
Installing secondary drainage to rugby pitch
the drain will only accept water from the area directly above it and slightly to the side. Pipe drainage systems are only effective when there is a zone of ‘free-water’ at the depth that they are installed. In this situation, the drains will ‘pull’ water that is above and to the side of the drain line due to the hydraulic head of water created above the drain.
Planning a drainage system means calling
in the experts. Sportsturf consultant, Gordon Jaaback, says; “A detailed professional investigation of the project beforehand should identify most of the problems. A comprehensive work plan and specification prepared by a consultant gives the contractor a clear idea of the scope of the work that is likely to be involved.” “Technical decisions reached early can
prevent unnecessary costs. Nothing is more costly to a contract than repeating an item of work that should have been done correctly the first time.”
Sand slit drainage systems Gordon Jaaback “ 120 I PC APRIL/MAY 2014
These systems are effective at increasing the drainage rate of a site as they effectively
bypass the soil and the sub-soil by providing a connection between the surface and the gravel over the pipe drain line. Sand slit drainage systems can often
become sealed at the surface after play. Heavy sand topdressing will reduce this problem, but the potential for capping the coarse grit-sand in a slit with the finer sand used for topdressing is sometimes a problem encountered by consultants. Good contractors are familiar with the properties of all types of sand.
Perched water table constructions
The majority of higher profile pitches and golf greens are constructed using this principle. The construction profile usually consists of a medium sand dominated rootzone over a gravel layer with drains below. A blinding layer of grit sand is often included between the rootzone and the gravel.
The profile always consists of finer
materials overlying coarser materials. Water will only move downwards through
the rootzone when the gravitational pull on the water exceeds the adhesive and cohesive
A detailed professional investigation of the project beforehand should identify most of the problems
Installing primary drainage to golf course fairway
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