Presentation on theme: "A Green Infrastructure Tour - The Washington Metropolitan Area - Developed under a grant from the National Park Service, National Capital Region through."— Presentation transcript:
A Green Infrastructure Tour - The Washington Metropolitan Area - Developed under a grant from the National Park Service, National Capital Region through the Metropolitan Washington Green Infrastructure Demonstration Project
Tour Introduction Purpose – To Provide Visitors and Residents of the Washington Metropolitan Area (WMA) (click to see map) with various examples of existing Best Management Practices (BMP’s) that are helping to sustain our local green infrastructure (e.g., agricultural and forested areas, stream valley parks, green roofs, low impact development techniques, stream valley restoration projects, etc.) and protect and restore our natural resources. (click to see map)
Tour Introduction – cont. The Anacostia was selected as the featured watershed because the breadth of related and representative practices present. We have also included two recently completed projects outside this watershed in the District of Columbia and Arlington County, Virginia. In addition to provide greater regional context and representation, we invite other submissions for green infrastructure sites to broaden the scope of this dynamic virtual tour.
Tour Logistics This tour has been intentionally designed so that all sites (click to see map) may be physically visited via automobile in one day. The sites in the Anacostia watershed are numbered in a logical line of travel via automobile. Alternatively, this presentation provides representative site information for those that may only have time for a virtual regional tour.(click to see map) There are also two other sites that lie outside the Anacostia watershed. These sites may be combined to modify the Anacostia Tour with those sites in the lower Anacostia Watershed in order to maintain a one-day tour.
Tour Logistics – Cont. Many sites are only accessible via automobile due to their remote locations. However, a few sites are accessible via Metro-Rail. Site accessibility is noted with each destination. When planning to conduct a tour of the sites in this presentation, please be sure to contact the landowners prior to your visit.
Anacostia Watershed Geographic Scope The 176 sq-mi. Anacostia River watershed, which encompasses portions of suburban Maryland and the District of Columbia (click to see map) is a green infrastructure microcosm of the larger 3,020 sq-mi Washington Metro Area.(click to see map)
The Metropolitan Washington Green Infrastructure Demonstration Project The Green Infrastructure Demonstration Project is a partnership between the National Park Service and the Metropolitan Washington Council of Governments to move parks, open space and recreation areas to the forefront -- these areas are the green infrastructure of the Metropolitan Washington. Through the use of geographical information; technical forums and workshops; improved communication; and targeted technical assistance, this project has worked to build a lasting public constituency and create a model public and private partnership for parks and open space. The Project’s ultimate goal is to impart a metropolitan region that continually strives to achieve a balance between the built environment and green space, sustained by natural processes and able to support and enhance the quality of life for its people and communities.
What is Green Infrastructure? Green Infrastructure is “Green Infrastructure is a network of open space, airsheds, watersheds, woodlands, wildlife habitat, parks, and other natural areas, which provide many vital services that sustain life and enrich quality of life”. President’s Council on Sustainable Development Report - 1999
“I think there’s an opportunity to look at how we regenerate communities and ecologies by looking at green space as a form of infrastructure like roads, water lines, and sewers. When we talk about green infrastructure in the Washington [D.C.] area, we talk about everything from window boxes, to Rock Creek Park and in between: it’s urban gardens, residential landscaping, pocket parks, landscaped portions of a development parcel, linear parks, riparian buffers, street trees, parkways, farms and large parks and reserves.” Green Infrastructure / Gray Infrastructure J. Glenn Eugster, National Park Service - OMG Open Space Roundtable -Philadelphia, 2001
Green Infrastructure Tour Sites: Visit The Anacostia Watershed (next slide) Visit The Arlington County Government Center Visit The National Park Service Center for Urban EcologyVisit The National Park Service Center for Urban Ecology
Address: 2000 Half Street, SW Washington, DC 20024 Phone: 202-479-6710 Fax: 202-479-9509 Email: info@ecc1info@ecc1 Ground Transportation Recommended Metro Rail Stop: Navy Yard (8 block walk) Tour Stop No. 1 Earth Conservation Corps Matthew Henson Earth Conservation Center
Green Roofs Green roofs are an alternative to traditional asphalt-based roofs constructed of waterproofing, soil and plants. They are an innovative stormwater management solution especially in intensely developed urban areas where open land is scarce. Green roofs have been used extensively in Europe for many years to improve water and air quality, mitigate the urban heat island effect, and improve the energy performance of buildings.
Site Features Green Roof Green Kiosk Rain Garden
Green Roof Looking north toward the Anacostia River and the Whitney Young Bridge
Green Roof Looking south toward the Matthew Henson second floor meeting room
Green Roof Close up view of Sedum sp. and other plant materials
Green Roofed Kiosk View of Kiosk at ECC with miniature green roof
Rain Garden Recently constructed rain garden immediately following a 0.5 inch rain fall event
Tour Stop No. 2 National Park Service Kenilworth Park and Aquatic Gardens/Marsh Address: Anacostia Ave. & Douglas St., N.E. Washington, D.C. 20019 Phone: 202-426-6905 Ground Transportation Recommended Metro Rail Stop: Closest is Minnesota Ave (several blocks)
Site Features Historic Aquatic Gardens (dating from the 1860’s) 32-acre freshwater tidal river marsh restoration project (constructed 1993) River trail and boardwalk (constructed 2002) Interpretative signage
Kenilworth Marsh Restoration 1993 At the time of its completion, this 32 acre tidal-fresh water restoration project was the largest of its kind in the U.S. It involved the raising of the marsh bed elevations through the addition of approximately 130,000 cubic yards of clean Anacostia River dredge spoil material and the planting of 300,000 native emergent aquatic plants Project partners included: National Park Service, U.S. Army Corps of Engineers, the District of Columbia and COG
Kenilworth Marsh – Before Restoration Anacostia River in foreground Kenilworth Marsh mud flats pre-restoration (circa 1989)
Kenilworth Marsh – Before Restoration Close up of extensive mud flat area where pre-restoration water depths were generally too deep to support emergent aquatic plants Marsh at low tide
Kenilworth Marsh - After Restoration Tidal gut at low tide
Kenilworth Marsh - After Restoration Tidal gut at high tide
Tour Stop No. 3 City of Greenbelt / Buddy Attick Lake Park Address: 555 Crescent Road Greenbelt, Md. 20770 Phone: City of Greenbelt: 301-474-8000 Buddy Attick Lake Park: 301- 397-2200 Ground Transportation Recommended
Site Features Historic Green Town with planned wooded open space areas and trail systems Greenbelt Museum (fully restored and furnished 1930’s house) 23-acre Greenbelt Lake and recreation area
Background/History of City of Greenbelt Greenbelt is one of three "green towns" built during President Franklin D. Roosevelt's Administration (The other two being Greenhills, OH and Greendale, WI). The primary purpose of these projects was to provide employment during the Great Depression, the green towns were innovative planned communities, designed to provide economical housing in a pleasant, healthy surrounding. In 1935, the U.S. Government assembled parcels of overworked farmland to become the site of a new community to be called Greenbelt. Groundbreaking was in October 1935 and the first residents arrived two years later. The government created a community of mixed housing types, a school, town center with shops and theater, underpasses, walkways, parks, playgrounds, swimming pool, and a 23 acre lake. For additional information see: http://www.ci.greenbelt.md.us/About_Greenbelt/history.htm
Tour Stop No. 4 U.S. Department of Agriculture Beltsville Agricultural Research Center (BARC) Address: National Visitor Center Building 302 (Log Lodge) Powder Mill Road Beltsville, Maryland 20705 Phone: 301-504-9403 Scheduled Tours Available (301-504-8483) Ground Transportation Recommended
Site Features Largest remaining green space in the Anacostia Watershed (7,200 acres) Working research farm National Visitor Center
Background The 7,200-acre Beltsville Agricultural Research Center is the largest and most prominent of USDA’s Agricultural Research Services 100-plus sites. It is a dynamic, highly diversified research facility featuring large expanses of forest and farm fields. The facility’s origins date back to livestock experiments in 1910. At its maximum size during the 1940’s, the facility encompassed over 14,000 acres of land. A trip to the ARS Visitor Center will provide guests a broad picture of agricultural research in America, as well as a glimpse back at the Washington Metro Area’s agricultural roots.
Aerial Photo of BARC, 2000 Visitor Center (Log Lodge) BARC property is outlined in red
Tour Stop No. 5 M-NCPPC Fairland Regional Park- Fairland Sports and Aquatics Complex Address: 13950 Old Gunpowder Rd Laurel, Maryland 20707 Phone: 301-504-9595 www.pgparks.com/places/parks/fairland.html Ground Transportation Recommended
Site Features Stormwater management demonstration area featuring parking lot sand filter, artificial wetlands, infiltration trench, grass swale and check dam system, and stormwater management wet pond Stormwater management pavilion and self-guided walking tour with interpretive signage Multi-recreational facilities including aquatic swim center, open and covered tennis courts, baseball and soccer fields and a hiker-biker trail system
Background 150 acre regional park (Prince George’s County, Maryland portion) Stormwater management pavilion and best management practices (BMP’s) demonstration area. Constructed in 1994 in partnership with Maryland Department of the Environment as a BMP demonstration site for both the public and building industry BMP demonstration area features parking lot sand filter, artificial wetlands, infiltration trench, grass swale and check dam system, and stormwater management wet pond
Fairland Sports and Aquatics Complex Facilities Map
Parking Lot Sand Filter Provides water quality control for the first 0.5 inches of runoff.
Infiltration Trench and Interpretive Signage Gravel-lined infiltration trench in background.
Chesapeake Bay Information Signage and Artificial Wetland Stormwater management wetland in background.
Grass Swale with Check Dams Provides first-flush water quality control.
Tour Stop No. 6 M-NCPPC Paint Branch Stream Valley Park/Hobbs Drive Site Address: 10011 Hobbs Drive Silver Spring, Maryland 20904 Contact Address: Maryland- National Capital Park and Planning Commission Department of Park and Planning 8787 Georgia Avenue Silver Spring, Maryland 20910 Phone: (301) 495-2500 E-mail: firstname.lastname@example.org@mncppc-mc.org Ground Transportation Recommended
Site Features: Wooded stream valley park area and trout stream in designated Montgomery County Special Protection Area (SPA). Large lot (1-2 acres) of single family residential development Open section road drainage
Background The Maryland-National Capital Park and Planning Commission is a bi-county agency empowered by the State of Maryland in 1927 to acquire, develop, maintain and administer a regional system of parks within Montgomery and Prince George's Counties, and to prepare and administer a general plan for the physical development of the two counties. In addition, the Commission gained responsibility for the public recreation program in Prince George's County in 1970. The Upper Paint Branch stream valley park system includes large conservation park designation areas intended for natural resource protection and non-developed recreational uses such as hiking, bird watching and fishing. The Paint Branch is unique in that it supports one of the WMA’s last self- sustaining trout fisheries.
Background – Cont. Since 1996, M-NCPPC and the state of Maryland have acquired over 400 acres in the Upper Paint Branch at a cost of over $20 million dollars to protect the trout resource. In 1997, Montgomery County created an SPA program to: establish coordinated procedures, performance goals, criteria and requirements for development that will mitigate adverse development-related impacts on water resources. To date, three areas in the County have been designated as SPA’s (Upper Paint Branch, Clarksburg and Piney Branch).
Hobbs Drive - Open Road Section The grass swale drainage system promotes infiltration and filtration of road runoff and increases flow-path and time of concentration.
Address: 1700 Block of Dennis Avenue Silver Spring, Maryland 20902 Contact Address: Montgomery County Government Department of Environmental Protection 255 Rockville Pike, Suite 120 Rockville, Maryland 20850 Phone: 240-777-7700 Ground Transportation Recommended Metro Rail Stop: Forest Glen or Wheaton Tour Stop No. 7 Wheaton Branch/Dennis Avenue Stormwater Management Facility
Background Keystone stormwater management retrofit facility constructed by Montgomery County Department of the Environment which is instrumental in the restoration of the highly urbanized Sligo Creek sub-watershed The 11 square mile Sligo Creek subwatershed is typical of the many older drainage basins in the WMA which were developed prior to the advent of stormwater management control requirements Land uses in the Sligo Creek subwatershed are predominantly residential with a commercial corridor located along MD Route 97 (Georgia Ave.). Most of the development in this subwatershed occurred between the 1930’s and the 1950’s The success of this stormwater retrofit facility has enabled the restoration of downstream degraded aquatic habitat in both the Wheaton Branch tributary and Sligo Creek mainstem
Site Features 3-celled extended detention stormwater management wet pond/marsh system constructed in 1989-90 Provides water quantity and quality control for a 55% impervious, 805 acre drainage area draining the Wheaton Branch headwaters 6-acre wet pool surface area with both aquatic and terrestrial plantings Cell No. 1 (closest to road) dredged in 1997. Note: over 3,000 yd 3 of sediment removed
Winter scene looking south toward concrete control structure Cell No. 2 - Winter Control structure
Cell No. 2 - Summer Summertime scene with creeping primrose willow (aquatic plant) in foreground
Site No. 8 M-NCPPC Sligo Creek Park /Forest Glen Road Address: 1400 Block of Forest Glen Road Silver Spring, Maryland 20910 Contact Address: Maryland-National Capital Park and Planning Commission Department of Park and Planning 8787 Georgia Avenue Silver Spring, MD 20910 Phone:(301) 495-2500 E-mail: email@example.com@mncppc-mc.org Ground Transportation Recommended Metro Stop: Closest is Forest Glen
Site Features: Representative stream restoration and stormwater management control area for the larger multi-agency Sligo Creek restoration effort Two off-line artificial marshes Stream habitat enhancement – (boulder placement and stone wing deflector) Understory reforestation Riparian buffers Hiker – Biker trail system Bio-filtration swale system (~200 feet long with pre- treatment sediment basin)
Background This portion of the Sligo Creek Stream Valley Park System is the site of stream restoration work completed between 1994-2002 It also includes various stormwater management BMP’s including artificial marshes and a bio- filtration swale system The Forest Glen Road marsh was constructed in 1994 and serves as both a stormwater management facility and wildlife habitat feature The Godwin Drive marsh was constructed in 1999 and provides stormwater management control for a 30 - acre residential neighborhood area
Site Map Wetland, bio-filtration, stream restoration area
Storm Flow Splitting Weir Godwin Drive weir design diverts first inch of runoff into marsh
Stone Wing Deflector and Boulder Placement Stone Wing Deflector Boulder Placement Looking upstream from Sligo Creek footbridge The techniques in this photograph were designed to enhance aquatic habitat for this degraded urban stream.
Sligo Creek Hiker-Biker Trail Signage This ten mile-long Hiker-Biker trail connects Wheaton Regional Park with the lower Northwest Branch Stream Valley Park
Bio-filtration Swale Pre-treatment sediment basin Bio-filtration swale 8-foot wide, 200-foot long bio-filtration swale (looking north toward Forest Glen Road) This BMP provides water quality control for an approximately 0.5 mile portion of Interstate 495
Bio-filtration Swale View of pre-treatment sediment basin and I-495 over pass
Forest Glen Road/Sligo Creek Parkway Intersection Concrete Flume Storm Drain Stormwater runoff from storm drain system treated in Forest Glen Road marsh Concrete flume
Tour Stop No. 9 M-NCPPC Sligo Creek Park/ Park Valley Road Address: 800 Block of Park Valley Road Silver Spring, Maryland 20910 Contact Address: Maryland- National Capital Park and Planning Commission Department of Park and Planning 8787 Georgia Avenue Silver Spring, Maryland 20910 Phone: (301) 495-2500 E-mail: firstname.lastname@example.org@mncppc-mc.org Ground Transportation Recommended
Site Features: Stream Habitat Enhancement (rootwads, j-hook, log spurs, boulder placement and rock spur). These are commonly employed techniques for both enhancing stream channel stability and fish habitat Understory Riparian Reforestation Plantings (both upstream and downstream of Park Valley Road) Narrow, Urban Stream Riparian Buffer Hiker – Biker Trail System
Background As part of the larger Sligo Creek restoration effort, this site features various 1999 vintage stream restoration project site areas, as well as riparian understory plantings This park area was acquired via Capper-Cramton Act funds which were used regionally to purchase open space areas (In 1930 this Act authorized funding for the acquisition of lands in the District of Columbia, Maryland, and Virginia for the park and parkway system of the national capital. Property acquisition included lands for George Washington Memorial Parkway; stream valley parks in Maryland and Virginia; and the park, parkway, and playground system of the District of Columbia) The Sligo Creek Stream Valley Park area featured herein, is one of the oldest park areas in the WMA and dates from the mid- 1930’s
Site Map Riparian reforestation and stream restoration area
J-Hook and Rootwad - Fish Habitat Enhancement Techniques J-Hook Rootwad View of J-Hook and Rootwad installed in 1999 to improve pool habitat
J-Hook and Rootwad Looking downstream at J-Hook (right side) and Rootwad Flow
Understory Plantings Planting area View of 1999 riparian reforestation planting area featuring 17 native tree and shrub species
Log Spur Log Spur employed both for deflecting storm flows away from bank areas and for fish habitat enhancement
Tour Stop No. 10 Mount Rainier Address: Bunker Hill Fire Station 3716 Rhode Island Avenue Mount Rainier, Maryland, 20712 Contact Address: Prince George’s County Department of Environmental Resources 9400 Peppercorn Place Largo, Maryland 20774 Phone: 301-883-5834 E-mail: DERcares@co.pg.md.usDERcares@co.pg.md.us Ground Transportation Recommended
Site Features: A municipal application of a Bio-retention stormwater management system Incorporates use of Low Impact Development (LID) techniques in construction. Reduces stormwater runoff to the Bay
Background - LID Low Impact Development (LID) is an innovative stormwater management approach with a basic principle that is modeled after nature: manage rainfall at the source using uniformly distributed decentralized micro-scale controls. LID's goal is to mimic a site's predevelopment hydrology by using design techniques that infiltrate, filter, store, evaporate, and detain runoff close to its source. LID addresses stormwater management through small, cost- effective landscape features located at the lot level. These landscape features, known as Integrated Management Practices (IMPs), are the building blocks of LID. Almost all components of the urban environment have the potential to serve as an IMP. This includes not only open space, but also rooftops, streetscapes, parking lots, sidewalks, and medians. LID is a versatile approach that can be applied equally well to new development, urban retrofits, and redevelopment / revitalization projects.
Background – LID Continued Bioretention Bioretention is a best management practice (BMP) developed in the early 1990's by the Prince George's County, MD, Department of Environmental Resources (PGDER). Bioretention utilizes soils and both woody and herbaceous plants to remove pollutants from storm water runoff. Stormwater runoff is conveyed as sheet flow to the treatment area, which consists of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, topsoil, and plants In bioretention systems, runoff passes over a grassed pre-treatment strip, which slows the runoff's velocity, distributes it evenly along the length of the ponding area (which consists of a surface mulch layer with plantings and the underlying topsoil). The ponding area is graded, its center depressed and water is ponded to a depth of 6 inches. Runoff gradually infiltrates into the underlying bioretention area and is evapo-transpired
Bunker Hill Fire Station Recently constructed fire station with bioretention system
Bioretention System Recently constructed bioretention system at Bunker Hill fire station
Bioretention Example of parking lot bioretention system treating stormwater runoff
Tour Stop No. 11 Bertie Backus Middle School District of Columbia Public Schools Bio-retention Area Site Address: 5707 South Dakota Ave, N.E. Washington, DC 20011 Phone: 202 596-6110 Principle: Alfonzo Powell Site Contact: Ms. Gloria Thompson 7 th Grade Science Teacher Project Installation Contact: Jim Shell – Metro-Wash. COG Phone: 202 962-3342 E-mail: email@example.com@mwcog.org Metro Rail Stop: Fort Totten
Site Features: Bio-retention cell retrofits in a large paved playground / parking area Three 64 square foot cells planted with native vegetation Metro accessible from the Fort Totten Metro (Red or Green Line) Accessible without a prior appointment or guide
Background The project described herein involved two DC Public Schools in the Anacostia watershed and featured the installation of bioretention cells, the planting of trees and shrubs, mulching of eroded areas, and cleaning of clogged storm drain inlets and installation of porous pavement in parking areas. The Pollution Prevention Program in the public schools has been an ongoing environmental education effort for both DC-DOH/EHA and COG. COG staff has worked within the WMA students to teach product substitution to reduce chemical usage, recycling and product reuse to reduce waste in concert with the national recycling motto, of “Reduce, Reuse and Recycle”.
Background – Cont. Through various programs, COG and DC-DOH/EHA have installed water-saving devices on faucets and toilets, instituted recycling programs, influenced a reduction in chemical use, addressed erosion problems, planted trees and cleaned out storm drains. This work was grant funded from the DC Department of Health Environmental Health Administration (DC- DOH/EHA) and the U.S. Environmental Protection Agency (EPA) and the Metropolitan Washington Council of Governments.
Bio-Retention Cell Installation Cutting through asphalt adjacent to the storm drains.
Bio-Retention Cell Installation Excavating holes through asphalt
Bio-Retention Cell Installation Breaking through storm drain inlet and checking fit of drain pipe coupling Installing gravel and perforated underdrain pipe Backfilling with a compost, topsoil and sand mix
Project at Completion Project Completed in June 2004
Tour Stop No. 12 Casey Trees Endowment – Green Roof Downtown Washington, DC Address: Casey Trees Endowment 1425 K Street, NW Washington, DC 20005 Phone: 202-833-4010 E-mail: friends @caseytrees.org Metro Rail Stop: Farragut North
Site Features: A partnership between the business and nonprofit sectors Tallest green roof in DC (12 stories high) 3500 square feet in size Planted in Spring of 2005 Monitoring equipment installed to measure temperature modification, moisture retention and effluent quality and quality to the stormwater system
Background This project is collaboration between DC Greenworks, Casey Trees and Blake Real Estate through a grant with the Chesapeake Bay Program’s Small Watershed Grants program through the National Fish and Wildlife Foundation and the Watershed Protection Division of the DC Department of Health. Installation was completed with the help of at-risk youth of Covenant House as well as Casey Trees volunteers Local roofing contractors and other businesses contributed their time at a reduced rate
Sites Outside the Anacostia Arlington County Governmental Center National Park Service – Center for Urban Ecology
Tour Stop No. 13 Arlington County Governmental Center Green Roof Site Address: 2100 Clarendon Boulevard Suite 801 Arlington, VA 22201 Project Contact: Joan Kelsch Phone: 703 228-3599 E-mail: firstname.lastname@example.org@arlingtonva.us Metro Stop: Courthouse – Orange Line
Site Features: Limited temperature monitoring 3,285 square feet in size Metro accessible from the Courthouse Metro Orange Line Accessible without a prior appointment or guide
Background Arlington County local government officials are encouraging developers to make projects more environmentally friendly, by practicing what they preach through the installation of a 3,285 square foot green roof that is viewable from the county’s third floor conference room at Courthouse Plaza. The new roof garden improves looks, energy-efficiency, and reduces stormwater runoff. The Barrett Green Roof Roofscapes system was installed on the building in September 2003. The project team consisted of the building owner, Charles E. Smith Company; the architect, Page Southerland Page; and Arlington County’s Department of Environmental Services and Office of Support Services. Barrett Roofs, Commercial Roofing, and Chapel Valley Landscaping were instrumental in completing the roof. Total installation costs for the green roof that has a life expectancy of approximately 40 years, was under $65,000.
Arlington County Governmental Center – Green Roof Post-Installation in late summer of 2003
Arlington County Governmental Center – Green Roof One Year’s Growth - Summer 2004 Go Back – Click Here
Tour Stop No. 14 National Park Service Green Roof at the Center for Urban Ecology (CUE) Site Address: Center for Urban Ecology 4598 MacArthur Blvd. NW Washington, DC 20007-4227 Project Contact: Jim Sherald and Doug Curtis Phone: (202) 342-1443 E-mail: email@example.com_sherald@nps.gov Doug_Curtis@nps.gov Ground Transportation Recommended
Site Features: CUE Limited temperature monitoring 7,000 square feet in size 90 % roof area planted An example of an ‘extensive’ green roof
Background CUE The Center for Urban Ecology (CUE), in Washington, DC, staffs the Natural Resources and Science Division for the National Park Service, National Capital Region. It is appropriate that this unit of the National Park Service be the first to install a green roof because of their vested interest in utilizing sustainable technology that reduces and/or mitigates the adverse impacts created by impervious surfaces in an ultra urban area. Architect? Contractor? Cost? Installation Date? Temperature Monitoring SWM Runoff calculations from the average storm event
Background CUE The roof construction under the green roof at CUE consists of a wood deck overlying steel web joists. A tapered rigid insulation board provides positive drainage to the gutters over an 80 mil. PVC roofing membrane. The soil media and plants are placed in sections that contain 2 foot by 2 foot plastic flats that are filled with 3 inches of planting media. The flats are placed right on top of the roofing membrane. A durable lightweight planting medium is used to prevent compaction and maintain the necessary pore space for water and oxygen retention. The planting medium consists of 75 to 85 percent inert expanded slate, with 15 to 25 percent organic material.
Green Roof at the Center for Urban Ecology Green Roof Under Construction
Green Roof at the Center for Urban Ecology The Completed Green Roof Go Back – Click Here
Washington Metropolitan Green Infrastructure Tour Contacts: Glenn Eugster Assistant Regional Director, Partnerships Office National Park Service, National Capital Region 1100 Ohio Drive, SW, Room 350, Washington, D.C. 20242 202 619-7492 Glenn_Eugster@nps.gov Brian M. LeCouteur Senior Environmental Planner / Urban Forester Metropolitan Washington Council of Governments 777 North Capitol St. N.E. Suite 300 Washington, DC 20002 202 962-3393 firstname.lastname@example.org John Galli Anacostia Program Manager Department of Environmental Programs Metropolitan Washington Council of Governments 777 North Capitol St. NE. Suite 300, Washington, D.C. 20002 202 962-3348 email@example.com