enlarged drainage swales may not be as financially onerous as conventional conveyance through carrier pipe drainage. There are also the maintenance costs to consider, as these systems require a degree of aftercare if they are to perform as intended. For example, ponds have a habit of becoming silted up and ditches choked with leaf litter and other debris, which can significantly reduce their capacity and efficiency. Maintenance of these areas is often tied in to the environmental management plan that, invariably, is required for new developments if they are deemed to potentially have a significant environmental impact.


attractions. Summing it all up


Sustainable drainage is the concept of maintaining the quality and quantity of surface run-off, i.e. drainage, whilst maximising biodiversity and amenity. Modern methods of draining sports


grounds and golf courses, and the demands of year round playability, must be considered in a wider environmental context. Planning regulations for new developments will often demand appropriate sustainable drainage proposals to be put in place and maintained for the future. Undoubtedly, it will become


increasingly more difficult to rely on


Green Roof - an innovative sustainable drainage design


Swale online with ditch


Backfilling soakaway trench on golf course


At a time of ‘credit crunch’, sustainable drainage could be considered by some as unnecessary ‘frills’ to satisfy the environmentalists. However, the more positive can see the potential for beneficial spin-offs, such as water feature creation and landscape enhancement. Water harvesting also has major


Wetland with boardwalk


conventionally designed drainage systems without due regard for the environmental impacts.


Sustainable drainage is not a substitute for efficient drainage but is complementary and, undoubtedly, represents the future for all drainage systems.


AFT Trenchers Ltd AFT45 For compact tractors from 20hp


With chain or slitting wheel, augers or conveyor to quickly install drainage systems, pipes or cables as and when needed.


Tel: +44 (0)1787 311811 Email: info@trenchers.co.uk www.trenchers.co.uk 87


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