Innovative Problem-Solving

Achieving LEED Platinum certification from the U.S. Green Building Council (USGBC) for a natatorium requires a dedicated team that thinks creatively and seizes every opportunity.

Natatorium scores LEED Platinum through careful planning.

The East Portland Community Center aquatics addition in Oregon is a model for this certification. The new construction added a 22,000-square-foot natatorium to an existing community center to create a full-service complex.

However, the project didn’t begin with the goal to achieve any level of LEED certification. In 2004 the city hired SERA Architects, a firm that specializes in parks and recreation facilities. However, as with many government projects, before it could begin–it was put on hold.

In the meantime, the city instituted a Green Building Policy in 2006 for new construction to meet LEED Gold certification. By 2007, the aquatics project was resurrected, and construction began with changes to meet the requirements for the certification.

“The team embraced the idea and wanted to exceed the policy of LEED Gold,” says Lisa Petterson, SERA’s project architect for the aquatics addition.

The addition features a family-oriented leisure pool with a water slide, current channel, warm-water lap lanes and play features; a lap pool with four 25-yard lanes; a whirlpool; locker rooms; event rooms and all the trappings to go with it.

But the most stunning feature of the natatorium isn’t the amenities–the facility operates on just 25 percent of the energy a typical natatorium requires. This results in an annual savings of more than 60 percent, or $54,000.

Project leaders scrutinized each LEED category, and maximized the LEED rating points using innovative problem-solving.

Filtration

With 120,000 gallons in the leisure pool and 90,000 gallons in the lap pool, a lot of water is there to circulate, filter, sanitize, and heat. Using a traditional sand-filter system would have resulted in thousands of gallons of water waste from the required backwashing.

Using this method also would have forced the construction and maintenance of a settling tank where water would be held until it could be used again. The sand system also requires cleaning two to three times per week, wasting not only water but also valuable manpower.

“We were in an area where the sewer pipes are small and couldn’t handle the backwash flow. We would have had to create a 10,000- to 15,000-gallon holding tank,” says Petterson. “We decided to utilize the Defender filter system that uses diatomaceous earth. The system is cleaned once every two weeks, and uses less water. This saves us over a million gallons annually.” The leisure pool, for example, only uses 750 gallons to backwash the diatomaceous earth. A Defender system also is employed on the lap pool.

An ultraviolet sanitization (UV) system is the primary sanitization for all three pools. The UV system helps to reduce the quantity of chlorine required.

The Water-Vapor Battle

Since natatoriums are notorious when water vapor creeps into the crevices and creates rot and corrosion problems, dehumidification is important to reduce the chloramines level in the air.

Therefore, building materials and equipment need to withstand these less-than-favorable conditions. “On the steel, we used a three-coating system that protects the steel from rusting,” says Petterson. “The steel is galvanized and then treated with a coating that is baked on.” Any nicks in the finish are treated in the field; this helps guard the steel from corrosion.

Keeping Warm

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