Chattahoochee Nature Center, The Discovery Center
   
Chattahoochee Nature Center, The Discovery Center; Photo of July 29, 2016 by Hilary Bradford.Project Name: Chattahoochee Nature Center, The Discovery Center
Year: 2009
Owner: Chattahoochee Nature Center
Location: Roswell, GA, USA
Building Type: Museum
Type: Semi-Extensive
System: Single Source Provider
Size: 2000 sq.ft.
Slope: 2%
Access: Inaccessible, Open to Public
Submitted by: The Chattahoochee Nature Center & Greenroofs.com

Designers/Manufacturers of Record:
General Contractor: Genoa Construction
Exhibit Design: AldrichPears Associates
Program Manager and Owner Representative: Silverman CPM
Mechanical, Electrical, Plumbing, Fire Protection, Commissioning: Newcomb & Boyd
Civil Engineer: AEC
Structural Engineer: Palmer Engineering Co.
Greenroof System: Extensive Garden Roofģ, American Hydrotech
Landscape Architect: Project Manager and Lead Designer, David Sacks, EDAW (now AECOM)
Architect: Lord Aeck Sargent
Native Plant Propagation: CNC Director of Grounds, Henning von Schmeling, Chattahoochee Nature Center
Planting Design: Micah Lipscomb, EDAW (now AECOM)
Entrance of the Chattahoochee Nature Center's Discovery Center; Photo of July 29, 2016 by Linda S. Velazquez.Close-up of the prickly pears and Stone Mountain daisies; Photo of July 29, 2016 by Linda S. Velazquez.On the deck of the Native Green Roof Terrace. Photo of July 29, 2016 by Linda S. Velazquez.
The Chattahoochee River provides a drinking water source for more than 3.5 million people, including 60 percent of metro Atlantans. The Chattahoochee Nature Center (CNC) is located on the Chattahoochee River in Roswell, Georgia and sits on a beautiful site comprised of 127 acres of native plants and gardens that showcase the area's beauty. The CNC is celebrating their 40th Anniversary throughout 2016, and their mission is to provide unique learning experiences focused on the Chattahoochee River that connect all people to the natural world and empower them to positively impact their local environments. The property includes a River Boardwalk, The Discovery Center, wetland demonstration gardens and woodland trails that are home to over 50 species of injured, non-releasable wildlife.

After leading the master planning efforts for the Chattahoochee Nature Center, Lord Aeck Sargent designed two built environments at the site, the two-story 10,000 square foot Discovery Center, which is the new entrance for the CNC, and the 4,000 square foot Ben Brady Lakeside Pavilion, an outdoor space for educational programs and special events.

Built into a hillside, The Discovery Center blends with the landscape and visitors enter through the upper level. "The Discovery Center Museum includes a two-level exhibit hall featuring both permanent and changing exhibits focusing on stewardship, conservation and education; a theater/classroom that seats 65 people; a lobby; and support spaces, such as offices and catering facilities. The building also has a rooftop terrace that provides views of the river and surrounding landscape.

"Given the Centerís mission of protecting the Chattahoochee River, measures to protect the river were a key sustainable design focus for the project. Natural stormwater management features were used throughout to reduce and treat stormwater. Constructed wetlands capture and filter runoff from the site. Roof runoff is harvested in cisterns for use in toilet flushing and minimal site irrigation. A majority of the site is landscaped with a native plant palette requiring no irrigation. Energy efficiency measures include a vegetated occupiable roof, daylighting, improved thermal envelope and high-efficiency HVAC equipment," (Lord Aeck Sargent).

In October 2010, The Discovery Center was certified Gold LEED with over 200 environmentally efficient and friendly practices and materials going into the construction of this unique building. The Discovery Center features engaging interactive exhibits; live, native animals; the Chattahoochee River Resource Gallery; exquisite Native Plant Gardens; The Nature Exchange; unique gifts and learning tools; and the Native Green Roof Terrace.

Located just off the upper exhibit gallery, the Green Roof Terrace offers stunning views of the surrounding forest and wetlands and winter views of the Chattahoochee River. Designed by EDAW (now AECOM) using the Extensive Garden Roofģ system from American Hydrotech, the Chattahoochee Nature Center greenroof covers about half the lower roof of The Discovery Center. Metal railings separate the terrace from the greenroof, making it inaccessible although completely visible. The other half of the Native Green Roof Terrace provides a spacious Trek patio deck with comfortable seating and tables for outdoor gatherings.
Below the CNC greenroof; Photo of July 29, 2016 by Linda S. Velazquez.Looking towards the upper exhibit gallery; Photo of July 29, 2016 by Linda S. Velazquez.
Planted with mostly native plants of the rock outcroppings found naturally in the Georgia Piedmont, "This will be the first roof in the region to incorporate this many native plants representing a wonderful natural community you can see at Stone Mountain and Mount Arabia preserve," (Henning von Schmeling, CNC Operations Senior Director personal communications, 2009). Henning was growing rare and endangered natives (including several rock outcrop species) in his CNC nursery facilities for the project and landscape architect Micah Lipscomb from EDAW (now AECOM) collaborated with Henning von Schmeling to design the unique plant palette.

"The Chattahoochee Nature Centerís roof top garden is a unique display of plants native to granite rock outcrops in the Piedmont region of Georgia. With over 90% of granite outcrops in the southeast located in the state of Georgia, this landscape is a signature part of the local landscape. Most people are familiar with Stone Mountain, but they are not aware of the unique assemblages of plants that have adapted to the extreme environments of granite outcrops.

"Many of the species found on these granite outcrops are found nowhere else in the world. Several endangered plants grow on these outcrops. The thin soils, limited water, and extreme temperatures of granite outcrops are remarkably similar to the conditions on green roofs. The plants found on granite outcrops are well suited to thrive on a green roof like the Chattahoochee Nature Centerís Discovery Center," (Chattahoochee Nature Center website). The CNC says the greenroof has a valuable environmental educational role in two key areas: 1) exposing the public and visitors to a plant palette not currently used in the greenroof industry; and 2) educating visitors about the underappreciated landscape of granite rock outcrops.

Over 80% of the greenroof features the granite outcrop plant palette, and the rest consists of sedums and other more traditional non-native plants included for both seasonal interest and as a counterpoint to the natives. Massed together to form a colorful tapestry year-round, with several planted in rock crevices, the native greenroof plants include: Sandwort (Minuartia uniflora); Large Flowered Tickseed (Coreopsis grandiflora); Pine Weed (Hypericum gentinioides); Little Blue Stem (Schizachyrium scoparium), Confederate Daisy or Stone Mountain Daisy (Helianthus porterii), Cottony Groundsel (Senecio tomentosa), Prickly Pear Cactus (Opuntia compressa), Appalachian Fameflower (Talinum teretifolium), Smallís Stonecrop (Diamorpha smallii), Spiderwort (Tradescantia ohiensis), Hairy Lip Fern (Cheilanthes lanosa), and Georgia Rush (Juncus georgianus). Interpretive signage on the Native Green Roof Terrace allows CNC education staff to use the space to teach the benefits of living roofs.

A reservoir was built into the wall just outside of the doors upon exiting the building from the River Resource Gallery on the bottom floor where rainwater is funneled from the slightly inclined upper butterfly roof of The Discovery Center. The four underground cisterns can hold up to 4,600 gallons of water, which are used to supply the low flow toilets and occasionally irrigate the gardens.

The $9.7 million project, which includes the Discovery Center and Ben Brady Lakeside Pavilion, exhibits, landscaping and site work, was privately funded. Major gifts included grants from the Robert W. Woodruff Foundation; the Chattahoochee Greenway Fund; The Kendeda Foundation; and a challenge grant from The Kresge Foundation.

The Discovery Center's greenroof was made possible by a generous grant from The Home Depot Foundation. If you would like to know more about the LEED Gold features of the Chattahoochee Nature Center's The Discovery Center, ask a Visitor Service Associate for more information or take the self guided Green Building Tour during your next visit.

The Chattahoochee Nature Center, The Discovery Center received the 2010 AIA Atlanta, Committee on the Environment award and the 2010 Greenprints Conference Showcase Winner. The Chattahoochee Nature Center is a unique place where people connect to each other and the land through a shared respect for nature: a safe place where interaction with nature excites the senses and encourages learning.

Additional thumbnail photos:

A view of the Native Green Roof Terrace from the Discovery Center entrance; Photo of July 29, 2016 by Hilary Bradford.The CNC Native Green Roof Terrace; Photo of July 29, 2016 by Hilary Bradford.The greenroof's interpretive signage informs visitors; Photo of July 29, 2016 by Linda S. Velazquez.Another view of the greenroof; Photo of July 29, 2016 by Linda S. Velazquez.The CNC Native Green Roof Terrace; Photo of July 29, 2016 by Linda S. Velazquez.
The Chattahoochee Nature Center is located at 9135 Willeo Road, Roswell, GA 30075; 770.992.2055. Visit their website, and specifically their Green Roof Terrace page, and their Facebook page. Watch the 2:32 Chattahoochee Nature Center, The Discovery Center - Project of the Week 8/8/16 video from Greenroofs.com on the greenroofsTV channel on YouTube. Greenroofs.com Project of the Week video photo and video credits: All courtesy of Linda S. Velazquez, Hilary Bradford, Joseph Velazquez, Chattahoochee Nature Center, and c 2009 Jonathan Hillyer / Atlanta via Pitchengine.

See the 5:39 video
Chattahoochee Nature Center's LEED Certified Discovery Center by Chattahoochee Nature Center in Roswell, GA. See the project profiles from Lord Aeck Sargent, Silverman CPM, Newcomb & Boyd, and Pitchengine. Read the July 31, 2009 Urban Nature Center and Pavilion Built with Sustainability, Economy in Mind by Russell Boniface in AIArchitect and the August 2, 2008 The Chattahoochee Nature Center enters a New Era by Expanding Its Mission and Goals. Welcome to the New Interpretive Center for the Chattahoochee River. CNC Press Release.

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