Magazine article Parks & Recreation

Saving Atlanta's Centennial Olympic Park from Concert Damage: Sand Capping with an Inorganic Soil Amendment Protects Grass from Hordes of Music Fans

Magazine article Parks & Recreation

Saving Atlanta's Centennial Olympic Park from Concert Damage: Sand Capping with an Inorganic Soil Amendment Protects Grass from Hordes of Music Fans

Article excerpt

In 2015, downtown Atlanta's landmark Centennial Olympic Park suffered a muddy beating from the feet of concertgoers. The 21-acre park saw 18 inches of rain in two months at the height of a spring festival season that drew 57,000 people for one, three-day event alone. The combination of heavy rains and heavy foot traffic left the area without a blade of grass once the mud dried, forcing a 100-day shutdown of the 3.5-acre concert area to regrow the ground cover.

Most of the rain-ravaged section was simply aerated, fertilized and irrigated, but, on the advice of a local turfgrass specialist, park officials decided to create a 10,000-square-foot demo area using a sand cap-based drainage system similar to those used on golf courses. The system included a new subgrade topped by drainage tiles, a 4-inch layer of gravel, and a 6-inch layer of sand mixed with 15 percent Profile Porous Ceramic (PPC) Greens Grade--an inorganic soil amendment that holds moisture nutrients and improves firmness and drainage in sand-based root zones. The goal was to compare mud and damage resistance between the areas with and without a sand cap when rain struck.

The first big test came in October 2015 at a sold-out Foo Fighters concert attended by 20,000 fans. Despite near-daily rain from the previous week and a steady drizzle during the event, the grass in the sandcapped section survived with little damage. In contrast, the untreated area turned nearly as muddy as before and was reduced to a hardscrabble expanse of brown with barely a trace of turf when the weather cleared.

"The sand cap was a tremendous success compared to the untreated native soils," says Steve Ware, ground operations manager for the Georgia World Congress Center Authority, which owns and manages Centennial Olympic Park. "We attribute that to a great design specification."

Those results prompted park officials to sand cap an additional 30,000 square feet of turf the following summer. The rest of the core 3.5-acre area is expected to be capped in phases in coming years. "Our hope is to be able to better handle our current and future event schedule because we have the right soil structure to withstand the constant traffic," Ware adds.

Olympic Legacy

Originally built for the 1996 Summer Olympics, Centennial Olympic Park is Downtown Atlanta's largest green space and one of the most lasting legacies of Atlanta's time in the Olympic spotlight. Since the 1996 Olympic Games, the park has attracted $2.2 billion in new development to Downtown Atlanta, with an additional $1.5 billion in development planned for the future. It functions as a performing arts venue, community gathering space and an anchor for downtown development.

The grass had tolerated light foot traffic for years without any major turf damage. Then, in 2011, the park began holding larger, ticketed events as part of an effort to boost the city's convention and tourism business. The bigger crowds initially had little effect on the turf, thanks to cooperative weather and a limited schedule, but the destruction sustained during the 2015 festival season sparked a search for a means of damage control.

"They needed to get the park back into shape, and, at the same time, they wanted to increase the number of events at the venue. …

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