Terrain Aeration

It's always Terrain when it pours

Enable Leisure and Culture (ELC) is a registered charity, contracted by Wandsworth Council to manage and develop the council’s parks, commons and playgrounds. Working in conjunction with sub-contractors such as idverde. ELC takes responsibility for monitoring the grounds maintenance across a total of 200 sites. Enable also advises Wandsworth Council on its responsibilities with respect to legislation relating to biodiversity and best practice in the ecological maintenance of parks. Among the sites under their watchful eye are the sports pitches, of which there are 95 football pitches, 10 cricket squares, bowling greens and running tracks.

“A lot of the sites are on made up ground and experience major problems with drainage,” says Andrew Green, Enable’s Parks Officer, Sports Provisions. “We have carried out aeration down to 300mm but it’s not enough to get to the pans.”

Andrew called on the services of Terrain Aeration whom he has used for around 20 years to deal with waterlogging problems, most recently for Tooting Common, with its six senior football pitches which became waterlogged in the winter season; along with Garratt Park and Fishponds Playing Fields. Terrain Aeration’s Terralift was brought in to apply deep penetration aeration to relieve the problem. The machine uses a JCB road breaker hammer to drive a hollow probe one metre into the soil. This is needed, especially on made up ground, because it is usually so compact at depth it requires the hammer to get through. Once the probe reaches the optimum depth, compressed air is released up to a maximum of 20Bar (280psi). This blast fractures the compacted soil to allow drainage and deep aeration.

The probe is withdrawn and, in the case of the work for Wandsworth, the process repeated using one and a half metre spacings on a staggered grid pattern. This means each shot interconnects the fissures. On the tail end of the blast, dried seaweed is injected which sticks to the walls of the fractures and fissures. Over time, this expands and contracts with the moisture content in the soil to effectively keep the ground drained. At Wandsworth the 1½" probe holes created by the Terralift machine were backfilled with Lytag aggregate to provide a semi-permanent aeration/ventilation shaft, helping to keep the whole aeration process working. Put simply, Andy Green says: “We wouldn’t do it if it didn’t work. We find the Terrain Aeration process is a cost-effective solution, without the need to dig up pitches and lay drainage.

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Terrain Aeration visit Cambridge University Botanic Garden

Cambridge University Botanic Garden welcomes 300,000 visitors a year, making it the most visited university botanic garden in the UK. Situated in the centre of Cambridge, the Grade II listed Heritage Garden covers 40 acres and is home to a collection of over 8,000 plant species to facilitate teaching and research. Equally, since its foundation it has provided a beautiful and tranquil place for everyone to enjoy. The Garden boasts four show lawns and the combination of foot traffic, marquee trucks and ride-on mowers leads to compaction. The Garden has been using Terrain Aeration’s decompaction services since as far back as 2013 and chose the deep aeration treatment for the high-profile area of the Main Lawn in front of the majestic glasshouses.
“We know Terrain Aeration’s work from years ago when development had been done at the Station Road Entrance and the lawn at the back of Cory Lodge,” says Adrian Holmes, Landscape and Machinery Supervisor at the Garden. “The lawns had been re-built after the work but were found to be compacted and the soil was not good. We had a waterlogging issue for a couple of years. The Terrain Aeration treatment rectified the problem and we know from experience it’s a long-term solution.”
This year, the Garden’s Main Lawn area was cordoned off, the machine operation creating considerable interest amongst students and visitors, and Terrain Aeration’s Terralift set to work. The weather was very good and dry, and the ground was worked easily without the need to use the Terralift’s JCB hammer drill. The machine’s probe is driven down a metre deep and highly compressed air released up to a maximum of 20Bar (280psi) to fracture the soil, opening it up for aeration, drainage and to get oxygen to the roots of the plant. On the tail end of the air blast, dried seaweed is incorporated which sticks to the walls of the fractures and fissures created by the main air blast. As pressure drops, the seaweed is mixed in the hopper unit where it swirls around with the remaining air and is then released. The seaweed swells in wet weather and keeps the fissures open. On the Main Lawn the same process was repeated in two-metre spacings, so the underground fracturing is thoroughly linked. In some extreme cases this is demonstrated by water fountains appearing from previous probe holes. In this instance the ground was found to be not as compacted as expected and the 2,500sq metre area was completed in two days, not the original three as had been expected.
“The Terrain Aeration guys were very good, prompt and efficient and quite knowledgeable,” says Adrian, “they backfilled the probe holes with Lytag, lightweight aggregate and it was as if they had never been there. It was great to have everything back to normal so quickly.” The aeration treatment completed, the lawn area was immediately open for unrestricted access to the fountains, glasshouses and horticultural and National Plant Collections.

See the Power of Deep Aeration at work with Terrain Aeration and the Terralift.

See Terrain Aeration in action

Return to Stourhead for Terrain Aeration

Many of the views at Stourhead, the Wiltshire estate cared for by National Trust since 1946, will be familiar from the 2005 adaptation of Pride and Prejudice starring Kiera Knightly. The estate was sold to wealthy banker Sir Henry Hoare in 1717 and today includes the Palladian mansion, built around 1725 and the village of Stourton. The world-famous garden was designed by Henry Hoare II and laid out in a classical 18th century design with a large lake.