Download the entire Volume 3 Criteria Manual - Urban Drainage ...
Download the entire Volume 3 Criteria Manual - Urban Drainage ... Download the entire Volume 3 Criteria Manual - Urban Drainage ...
T-4 Green Roof Websites for Additional Design Ideas Colorado Colorado State University: http://greenroof.agsci.colostate.edu/ Green Roofs of Colorado: http://www.greenroofsco.com/ Denver Botanic Gardens: http://www.botanicgardens.org/content/green-roof Other Research Programs and Resources Pennsylvania State University Michigan State University North Carolina State University Southern Illinois University LBJ Wildflower Center/University of Texas at Austin Green Roofs for Healthy Cities GreenRoofs.com American Society of Landscape Architects: http://land.asla.org/050205/greenroofcentral.html Low Impact Development Center: http://www.lid-stormwater.net/ Construction Considerations Success of green roofs depends not only on a good design and maintenance, but also on construction practices that enable the BMP to function as designed. Construction considerations include: • Permit Requirements, General Coordination, and Warranties: Investigate permitting requirements for green roofs in the local jurisdiction. Significant coordination between architects, engineers, roofers, and landscapers is needed. Contractually, it is common to have the roofer warranty the impermeable membrane, whereas the landscaper would be responsible for the growing media, vegetation, and other landscaping. Typically, irrigation systems have warranties, but plants do not, with the exception of situations where a maintenance contract is in place. Where a maintenance contract is in place, some landscapers or greenhouses will provide plant warranties. • Roof Membrane: Inspect the roof membrane (the most crucial element of a green roof) and conduct a leak test prior to installing the remaining layers of the roof. • Installation Safety: Most landscapers are accustomed to working on the ground, so safety training is important. If the green roof will be accessible to the public, safety at roof edges should be of paramount concern. GR-10 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3
Green Roof T-4 Colorado Examples There are several green roof installations in Colorado designed to achieve varying goals that include reductions in stormwater volume, pollutants, and/or urban heat island effects, as well as aesthetic goals. These are briefly described below. • EPA Building (Denver): Installed in 2006, this is a modular, 20,000 square foot, extensive green roof, currently planted primarily with sedum and equipped with spray irrigation. This roof is designed to be monitored for several purposes: o o o Biological/horticultural viability, Stormwater benefits, and Heat island reduction effects. The extensive planting scheme consists of sedums selected in accordance with USDA hardiness zone classification in 2-inch by 4-inch modules with a 4-inch depth. • Denver Botanic Gardens: Located inside Denver Botanic Gardens, this publicly accessible green roof, installed in 2007, is a semi-intensive retrofit of a 1950s structure. The main purpose of the roof is to identify and test a broad palette of plants that may be feasible for Colorado green roofs. The roof is fully exposed to the south and currently features approximately 60 genera. The roof is fitted with both drip and spray irrigation. Four irrigation zones are monitored and adjusted according to weather and temperature. All green roof irrigation is recorded and stored in a central database. Photograph GR- 4: A modular, extensive green roof in the spring on the Environmental Protection Agency Region 8 Headquarters in downtown Denver. Photo courtesy of Jennifer Bousselot. Photograph GR-5. A continuous green roof system at the Denver Botanic Gardens. It is a predominantly extensive system with some intensive areas. Photo courtesy of Denver Botanic Gardens November 2010 Urban Drainage and Flood Control District GR-11 Urban Storm Drainage Criteria Manual Volume 3
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Green Roof T-4<br />
Colorado Examples<br />
There are several green roof installations in Colorado designed to achieve varying goals that include<br />
reductions in stormwater volume, pollutants, and/or urban heat island effects, as well as aes<strong>the</strong>tic goals.<br />
These are briefly described below.<br />
• EPA Building (Denver): Installed in 2006, this is a modular, 20,000 square foot, extensive green<br />
roof, currently planted primarily with sedum and equipped with spray irrigation. This roof is<br />
designed to be monitored for<br />
several purposes:<br />
o<br />
o<br />
o<br />
Biological/horticultural<br />
viability,<br />
Stormwater benefits, and<br />
Heat island reduction effects.<br />
The extensive planting scheme<br />
consists of sedums selected in<br />
accordance with USDA hardiness<br />
zone classification in 2-inch by<br />
4-inch modules with a 4-inch<br />
depth.<br />
• Denver Botanic Gardens:<br />
Located inside Denver Botanic<br />
Gardens, this publicly accessible<br />
green roof, installed in 2007, is a<br />
semi-intensive retrofit of a 1950s<br />
structure. The main purpose of <strong>the</strong><br />
roof is to identify and test a broad<br />
palette of plants that may be<br />
feasible for Colorado green roofs.<br />
The roof is fully exposed to <strong>the</strong><br />
south and currently features<br />
approximately 60 genera.<br />
The roof is fitted with both drip<br />
and spray irrigation. Four<br />
irrigation zones are monitored and<br />
adjusted according to wea<strong>the</strong>r and<br />
temperature. All green roof<br />
irrigation is recorded and stored in<br />
a central database.<br />
Photograph GR- 4: A modular, extensive green roof in <strong>the</strong> spring on <strong>the</strong><br />
Environmental Protection Agency Region 8 Headquarters in downtown<br />
Denver. Photo courtesy of Jennifer Bousselot.<br />
Photograph GR-5. A continuous green roof system at <strong>the</strong> Denver Botanic<br />
Gardens. It is a predominantly extensive system with some intensive areas.<br />
Photo courtesy of Denver Botanic Gardens<br />
November 2010 <strong>Urban</strong> <strong>Drainage</strong> and Flood Control District GR-11<br />
<strong>Urban</strong> Storm <strong>Drainage</strong> <strong>Criteria</strong> <strong>Manual</strong> <strong>Volume</strong> 3
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