The Greenroof Pavilion & Greenroof Trial Gardens of Rock Mill Park
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The Rock Mill Park Greenroof Pavilion on April 11, 2008; Photos by Linda S. Velazquez unless noted otherwise.Project Name: The Greenroof Pavilion & Greenroof Trial Gardens of Rock Mill Park
Year: 2007
Owner: The City of Alpharetta
Location: Alpharetta, GA, USA
Building Type: Park
Type: Semi-Intensive, Test/Research
System: Single Source Provider
Size: 668 sq.ft.
Slope: 8%
Access: Inaccessible, Open to Public
Submitted by: Linda Velazquez, Greenroofs.com/Sky Gardens Design

Designers/Manufacturers of Record:
Greenroof Designer & Consultant: Linda S. Velazquez, Sky Gardens Design & Greenroofs.com
Greenroof Pavilion System: American Hydrotech
Greenroof Trial Models Construction: Doug and Janet Faust
Modular Systems on Trial Models: Green Roof Blocks, Green Paks, GreenGrid, GreenTech
Drainage for Greenroof Trial Models: JDRain, JDR Enterprises
Plant Supplier: Bobby Saul, Saul Nurseries
Plant Supplier: Ed Snodgrass, Emory Knoll Farms/ Green Roof Plants
Landscape Architect for Park: Scott Talbot, Breedlove Land Planning, Inc.
Architect: Dave McCauley, Lyman, Davidson Dooley Architects, Inc.
Greenroof Demonstration/Trial Models Sponsor: JDR Enterprises, Inc.
Growing Media: Erth Products
Sloping view from the East during construction; 10.07; Photo Courtesy Breedlove Land PlanningClose up of the Greenroof Pavilion on September 4, 2008; Photo by LSV Rock Mill Park; Photo By and Copyright Harris Hatcher Photography 2008
The Alpharetta Rock Mill Park enjoys great public interaction, visibility, and learning opportunities for Georgia residents and visitors. The Greenroof Pavilion's many ecological and aesthetic benefits help promote innovative "green architecture" stormwater management while sustaining a healthy human and biological community. Rock Mill Park is a showcase for stormwater quality treatment and aside from the Greenroof Pavilion includes constructed wetlands, sand and biofiltration ponds, and connectivity to the popular Big Creek Greenway path system.

Rock Mill Park was presented the region's Watershed/Stormwater Project of Excellence STREAM Award at the 2016 Metropolitan North Georgia Water Planning District's 15th Anniversary Celebration. The City of Alpharetta also received the 2008 Water Resources Project of Excellence award for Rock Mill Park, given annually by the Georgia Association of Water Professionals and the Georgia Section of the American Water Resources Association to a project in Georgia that provides for water quality, habitat or flood control and in addition, Rock Mill Park won a 2008 Georgia ASLA Merit Award.

While many people have been involved with the Park from the late 1990's, in particular this project has been championed by former Alpharetta Councilwoman Debbie Gibson. The 576 sf Greenroof Pavilion of Rock Mill Park was initially designed by Linda Velazquez in 2000 while a senior at the University of Georgia, in partial fulfillment of her Bachelor's of Landscape Architecture. She selected the natural site as her Senior Project after interning with the City of Alpharetta in 1999 and researching the cultural and historical attributes of the 40-acre wetlands, woodlands and upland forest site of the sensitive Big Creek watershed. Linda discovered the original owner of the site to be "Sitawake," Situ,wa,ka, or Situwakee, a full-blood Cherokee who was also a private or warrior in the Creek War of 1813-14, in Captain John Brown's Company. Copies of original documents from the Georgia State Archives and the National Archives in Washington, D.C. include Gold Lottery Maps showing "Indian Possession," Cherokee Land and Valuation Assessments, military records, and more. Linda says, "My on-going research continues to explore the possibility that our Alpharetta Sitawake is the same prominent minor Cherokee chief Situwakee who was a Trail of Tears Detachment Leader in 1838."

Taking the cultural significance and potential importance of the original Cherokee ownership into consideration along with the City's desire to protect and highlight the southeastern Piedmont watershed area, Linda originally designed the space as "The Greenroof Pavilion and Cherokee Lore Trails of The Alpharetta Environmental Education Center: Celebrating Ecological Design in a Native Landscape." Along with the Greenroof Pavilion were trails denoting significant native and introduced plants used by the Cherokees for medicinal and cultural reasons, set along paths with historical and cultural signage highlighting property documents and Cherokee myths and other lore. The plan for the Education Center was later replaced with a passive park for Alpharetta residents which respects its natural surrounding by implementing many Low Impact Development (LID) techniques, including the now updated 24' x 24' Greenroof Pavilion.
The Non-Native Plants Conventional Trial ModelThe Native Plants Conventional Trial Model
Funded in part by an EPA Clean Water Act Section 319 Grant and the recipient of greenroof material donations from many companies, the Greenroof Pavilion was planted on October 25, 2007. Breedlove Land Planning, Inc. and Lyman, Davidson Dooley Architects, Inc. transformed Linda's original vision of the Greenroof Pavilion's architectural character into a beautiful structure set within many prominent stormwater features. The 6 - 1/2" deep growing media of the planting plan represents the sloping topography towards Big Creek, from high to low, dry to wet conditions reflecting watershed movement from a meandering meadow-like design to a flowing river pattern. Linda selected both native and introduced species to represent an aesthetically pleasing, sustainable plant community historically found in the Piedmont forest/wetland area of the Big Creek watershed.

The sensitive cultural and physical nature of the site's Cherokee history shall be honored and preserved to showcase the truly unique character of the site's "Genius Loci," or Spirit of Place through certain plant selections and other site elements. Some of these include: The Native Vine Display - a trellised living wall of sorts which acts as passive solar shading for The Greenroof Pavilion. The choice of seven vines is a design representation of the seven Cherokee clans and include: Cross Vine; Trumpet Creeper; Virgin's Bower; Climbing Hydrangea; Carolina Yellow Jessamine; Yellow Coral Honeysuckle; and Passion Flower. Two copper hummingbird rain chains terminate into Mini-Rain Gardens on the low side, celebrating the natural flow of water back to nature.

Linda based the design of the Greenroof Demonstration Model & Trial Gardens modules (approximately a total of 92 sf) on the previous work of Janet Faust, formerly with JDR Enterprises; in fact, she and her husband Doug built them all with materials donated by JDR. The four tabletop models at ground level include The Greenroof Demonstration Model, a 6' x 3' module with three panels: the first is a Mock-Up using selective plants from the four zones found on top of the actual Greenroof Pavilion; the center panel is the asphalt tiled, non-greened Control Panel, where we can test for stormwater runoff rates and pollutants as compared the Greenroof; and the third panel shows the Material Section of the American Hydrotech greenroof system used.

The three Greenroof Trial Models have been monitored for plant types including grasses, perennials and succulents; system types; growing media; and stormwater quantity and quality. Two 6' x 3' Conventional Greenroof Trial Models are built-in-place layered system tabletops, one trialing native plants while a second trials non-natives. The third tabletop is a 8' 5" x 4' 5" Modular Greenroof Trial Model. Four modular systems are currently being studied here at the following depths: Green Roof Blocks @ 4", Green Paks @ 4", GreenGrid @ 4", and GreenTech @ 8.5" deep.

Additional thumbnail photos:

The Modular Trial Model with 4 systemsThe Demonstration Model, L-R: Representative Greenroof Plants found on top; Control Panel; and American Hydrotech Material Section, on 04.11.08.Master Plan, including site section through meadow, forest, wetlands, down to Big Creek; Drawings by Linda S. VelazquezThe Greenroof Pavilion's Mini-Rain Chain Gardens, Fall 07 and Winter 08; Photo by Linda S. VelazquezThe Rock Mill Park Greenroof Pavilion on April 11, 2008; Photo & design by Linda S. Velazquez
Rock Mill Park is open daily to the public and is located at 3100 Kimball Bridge Road, Alpharetta GA 30022 (the intersection of Rock Mill Road and Kimball Bridge Road. Learn about the City of Alpharetta. Check out the first episode of Greenroofs.com's WebTV series "Sky Gardens ~ Greenroofs of the World" featuring Rock Mill Park: 1 of 4; 2 of 4; 3 of 4; and 4 of 4. See Greenroofs.com's 60-second video "Love the Earth: Plant a Roof!" from May, 2008 for The Sundance Channel's The Green "What's the Big Idea" Contest, which made it as a semi-finalist. For more info about the greenroof, please contact designer Linda S. Velazquez, ASLA, LEED AP, GRP of Sky Gardens Design and Greenroofs.com at: linda@greenroofs.com.

Learn more about each of the following providers in The Greenroof & Greenwall Directory:
American Hydrotech; JDR Enterprises; ERTH Products; and Green Roof Blocks. Visit Saul Nurseries at: http://www.saulnurseries.com/.
 
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