Green infrastructure

Street-side swale and adjacent pervious concrete sidewalk in Seattle, US. Stormwater is infiltrated through these features into soil, thereby reducing levels of urban runoff to city storm sewers.

Green Infrastructure or blue-green infrastructure is a network providing the “ingredients” for solving urban and climatic challenges by building with nature.[1] The main components of this approach include stormwater management, climate adaptation, less heat stress, more biodiversity, food production, better air quality, sustainable energy production, clean water and healthy soils, as well as the more anthropocentric functions such as increased quality of life through recreation and providing shade and shelter in and around towns and cities. Green infrastructure also serves to provide an ecological framework for social, economic and environmental health of the surroundings.

Introduction

Green infrastructure

Nature can be used to provide important services for communities by protecting them against flooding or excessive heat, or helping to improve air, soil and water quality. When nature is harnessed by people and used as an infrastructural system it is called “green infrastructure”.[2] Green infrastructure occurs at all scales. It is most often associated with storm water management systems, which are smart and cost-effective.[3] However, green infrastructure is really a bigger concept and is closely associated with many other things. Green infrastructure also serves to provide an ecological framework for social, economic and environmental health of the surroundings.[4]

Benefits

Some people might expect that green spaces are excessive to maintain and extravagant in nature, but high-performing green spaces can provide real economic, ecological and social benefits. For example:

In result, high performing green spaces work to create a balance between built and natural environments.[3]

Economic effects

A study in 2012 that focused on 479 green infrastructure projects across the United States, found that 44% of green infrastructure projects reduced costs compared to the 31% that increased the costs. The most notable cost savings were due to reduced stormwater runoff and decreased heating and cooling costs.[6][7]

Terminology

Ideas for green urban structures began in the 1870s, with concepts of urban farming and garden allotments.[1] Alternative terminology includes stormwater Best Management Practices (BMPs), source controls, and Low Impact Development practices (LIDs).[8]

Green infrastructure originated in Best Management Practices (BMPs) proposed to achieve more holistic stormwater quantity management goals for runoff volume reduction / erosion prevention, and aquifer recharge in the mid 1980's.[9] In 1987, amendments to the Clean Water Act introduced new provisions for management of diffuse pollutant sources from urban land uses, establishing the regulatory need for practices that unlike conventional drainage infrastructure managed runoff 'at source'. Under the Act, the EPA introduced NPDES regulations for municipalities in 1990, requiring the development of a storm water pollution prevention plan and the implementation of "source control practices". The EPA's 1993 handbook Urban Runoff Pollution Prevention and Control Planning identified BMPs to consider in such plans, including vegetative controls, filtration practices and infiltration practices (trenches, porous pavement).[10]

Green Infrastructure is a concept that highlights the importance of the natural environment in decisions about land-use planning.[11][12] However, the term does not have a widely recognised definition.[13][14] Also known as “blue-green infrastructure”[15] or “green-blue urban grids”[1] the terms are used by many design-, conservation- and planning related disciplines and commonly feature stormwater management, climate adaptation and multifunctional green space.

The term "green infrastructure" is sometimes expanded to "multifunctional" green infrastructure. Multifunctionality in this context refers to the integration and interaction of different functions or activities on the same piece of land.

The United States Environmental Protection Agency (EPA) has extended the concept of “green infrastructure” to apply to the management of stormwater runoff at the local level through the use of natural systems, or engineered systems that mimic natural systems, to treat polluted runoff.[16][17] This use of the term "green infrastructure" to refer to urban "green" best management practices (BMPs), although not central to the larger concept, does contribute to the overall health of natural ecosystems.

However, it is apparent that the term “blue-green infrastructure” is applied in an urban context and places a greater emphasis on the management of stormwater as an integral part of creating a sustainable, multifunctional urban environment.[15]

The role of water

Many cities are facing severe water uncertainties, such as floods, droughts and upstream activities on trans-boundary rivers. The increasing pressure, intensity and speed of urbanisation has led to the disappearance of any visible form of water infrastructure in most cities.[18]

One fifth of the world’s population, 1.2 billion people, live in areas of water scarcity. Climate change and water-related disasters will place increasing demands on urban systems and will result in increased migration to urban areas. Cities require a very large input of freshwater and in turn have a huge impact on freshwater systems. Urban and industrial water use is projected to double by 2050.[19]

In 2010 the UN declared access to clean water and sanitation a Human Right.[20] New solutions for improving the sustainability of cities are being explored. Good urban water management is complex and requires not only water and wastewater infrastructure, but also pollution control and flood prevention. It requires coordination across many sectors and between different local authorities and changes in governance that lead to more sustainable and equitable use of the urban water resources.[19]

Types of green infrastructure

Urban forests

Urban forests are forests located in cities. They are an important component of urban green infrastructure systems. Urban forests use appropriate tree and vegetation species, instead of noxious and invasive kinds, which reduce the need of maintenance and irrigation.[21] In addition, native species also provide aesthetic value while reducing cost. Diversity of plant species should also be considered in design of urban forests to avoid monocultures; this makes the urban forests more durable and resilient to pests and other harms.[21] In the United States, a federal legislation known as The Energy Conservation Through Trees Act, authored by Congresswoman Doris Matsui of Sacramento, encourages residents to plant shade trees to reduce heating and cooling costs.[21]

Benefits

Constructed wetlands

Constructed wetlands are manmade wetlands, which work as a bio-filtration system. They contain wetland vegetation and are mostly built on uplands and floodplains.[22] Constructed wetlands are built this way to avoid connection or damage to natural wetlands and other aquatic resources.[22] There are two main categories of constructed wetlands: subsurface flow system and free water surface system.[22] Proper planning and operating can help avoid possible harm done to the wetlands, which are caused by alteration of natural hydrology and introduction of invasive species.[22]

Benefits

Green roofs and green walls

Green roofs improve air and water quality while reducing energy cost. The plants and soil provide more green space and insulation on roofs. Green roofs also help reducing city runoff by retaining rainfall.[24]

Planning approach

The Green Infrastructure approach analyses the natural environment in a way that highlights its function and subsequently seeks to put in place, through regulatory or planning policy, mechanisms that safeguard critical natural areas. Where life support functions are found to be lacking, plans may propose how these can be put in place through landscaped and/or engineered improvements.[25]

Within an urban context, this can be applied to re-introducing natural waterways[26] and making a city self-sustaining particularly with regard to water, for example, to harvest water locally, recycle it, re-use it and integrate stormwater management into everyday infrastructure.[27]

The multi-functionality of this approach is key to the efficient and sustainable use of land, especially in a compact and bustling country such as England where pressures on land are particularly acute. An example might be an urban edge river floodplain which provides a repository for flood waters, acts as a nature reserve, provides a recreational green space and could also be productively farmed (probably through grazing). There is growing evidence that the natural environment also has a positive effect on human health[28]

United Kingdom

In the United Kingdom, Green Infrastructure planning is increasingly recognised as a valuable approach for spatial planning and is now seen in national, regional and local planning and policy documents and strategies, for example in the Milton Keynes and South Midlands Growth area.[29]

In 2009, guidance on green infrastructure planning was published by Natural England, and can be accessed online at This guidance promotes the importance of green infrastructure in 'place-making', i.e. in recognizing and maintaining the character of a particular location, especially where new developments are planned.[30]

In North West England the former Regional Spatial Strategy had a specific Green Infrastructure Policy (EM3 - Green Infrastructure) as well as other references to the concept in other land use development policies (e.g. DP6).[31] The policy was supported by the North West Green Infrastructure Guide.[32] The Green Infrastructure Think Tank (GrITT) provides the support for policy development in the region and manages the web site that acts as a repository for information on Green Infrastructure.[33]

The Natural Economy Northwest programme has supported a number of projects, commissioned by The Mersey Forest to develop the evidence base for green infrastructure in the region. In particular work has been undertaken to look at the economic value of green infrastructure, the linkage between grey and green infrastructure and also to identify areas where green infrastructure may play critical role in helping to overcome issues such as risks of flood or poor air quality.

In March 2011, a prototype Green Infrastructure Valuation Toolkit[34] was launched. The Toolkit is available under a Creative Commons licence, and provides a range of tools that provide economic valuation of green infrastructure interventions. The toolkit has been trialled in a number of areas and strategies, including the Liverpool Green Infrastructure Strategy.[35]

In 2012, the Greater London Authority published the All London Green Grid Supplementary Planning Guidance (ALGG SPG) which proposes an integrated network of green and open spaces together with the Blue Ribbon Network of rivers and waterways. The ALGG SPG aims to promote the concept of green infrastructure, and increase its delivery by boroughs, developers, and communities, to benefit areas such as sustainable travel, flood management, healthy living and the economic and social uplift these support.[36]

Green Infrastructure is being promoted as an effective and efficient response to projected climate change.[37]

Green Infrastructure may include geodiversity objectives.[38]

United States

Alley renovated with permeable paving located in Chicago, Illinois.

Green infrastructure programs managed by EPA and partner organizations are intended to improve water quality generally through more extensive management of stormwater runoff. The practices are expected to reduce stress on traditional water drainage infrastructure--storm sewers and combined sewers—which are typically extensive networks of underground pipes and/or surface water channels in U.S. cities, towns and suburban areas. Improved stormwater management is expected to reduce the frequency of combined sewer overflows and sanitary sewer overflows, reduce the impacts of urban flooding, and provide other environmental benefits.[39][40]

For example, the City of Philadelphia has installed or supported a variety of retrofit projects in neighborhoods throughout the city. Installed improvements include:

Some of these facilities reduce the volume of runoff entering the city's aging combined sewer system, and thereby reduce the extent of system overflows during rainstorms.[41]

Another U.S. example is the State of Maryland's promotion of a program called GreenPrint. GreenPrint Maryland is the first web-enabled map in the nation that shows the relative ecological importance of every parcel of land in the state.

Combining color-coded maps, information layers, and aerial photography with public openness and transparency, Greenprint Maryland applies the best environmental science and Geographic Information Systems (GIS) to the urgent work of preserving and protecting environmentally critical lands. A valuable new tool not only for making land conservation decisions today, but for building a broader and better informed public consensus for sustainable growth and land preservation decisions into the future.

The program was established in 2001 with the objective to “preserve an extensive, intertwined network of land vital to the long-term survival of our native plants and wildlife and industries dependent on clean environment and abundant natural resources.”[42]

In April 2011, EPA announced the Strategic Agenda to Protect Waters and Build More Livable Communities through Green Infrastructure and the selection of the first ten communities to be green infrastructure partners.[43][44] The communities selected were: Austin, TX; Chelsea, MA; the Northeast Ohio Regional Sewer District (Cleveland, OH); the City and County of Denver, CO; Jacksonville, FL; Kansas City, MO; Los Angeles, CA; Puyallup, WA; Onondaga County and the City of Syracuse, NY; and Washington, DC.[45]

The Federal Emergency Management Agency (FEMA) is also promoting green infrastructure as a means of managing urban flooding (also known as localized flooding).[46]

Singapore

Since 2009, two editions of the ABC (Active, Beautiful, Clean) Waters Design Guidelines have been published by the Public Utilities Board (PUB), Singapore. The latest version (2011) contains planning and design considerations for the holistic integration of drains, canals and reservoirs with the surrounding environment. PUB encourages the various stakeholders — landowners, private developers to incorporate ABC Waters design features into their developments, and the community to embrace these infrastructures for recreational & educational purposes.

The main benefits outlined in the ABC Waters Concept include:

Other states

A 2012 paper by the Overseas Development Institute reviewed evidence of the economic impacts of green infrastructure in fragile states.

Upfront construction costs for GI were up to 8% higher than non-green infrastructure projects. Climate Finance was not adequately captured by Fragile states for GI investments, and governance issues may further hinder capability to take full advantage.

GI Investments needed strong government participation as well as institutional capacities and capabilities that fragile states may not possess. Potential poverty reduction includes improved agricultural yields and higher rural electrification rates, benefits that can be transmitted to other sectors of the economy not directly linked to the GI investment.

Whilst there are examples of GI investments creating new jobs in a number of sectors, it is unclear what the employment opportunities advantages are in respect to traditional infrastructure investments. The correct market conditions (i.e. labour regulations or energy demand) are also required in order to maximise employment creation opportunities.

Such factors that may not be fully exploited by fragile state governments lacking the capacity to do so. GI investments have a number of co-benefits including increased energy security and improved health outcomes, whilst a potential reduction of a country’s vulnerability to the negative effects of climate change being arguably the most important co-benefit for such investments in a fragile state context.

There is some evidence that GI options are taken into consideration during project appraisal. Engagement mostly occurs in projects specifically designed with green goals, hence there is no data showing decision making that leads to a shift towards any green alternative. Comparisons of costs, co-benefits, poverty reduction benefits or employment creation benefits between the two typologies are also not evident.[48]

Examples

ABC Water Design Guidelines by PUB in Singapore

Since 2009, two editions of the ABC (Active, Beautiful, Clean) Waters Design Guidelines have been published by the Public Utilities Board (PUB), Singapore. The latest version in 2011 contains planning and design considerations for the holistic integration of drains, canals and reservoirs with the surrounding environment. PUB encourages the various stakeholders — landowners, private developers to incorporate ABC Waters design features into their developments, and the community to embrace these infrastructures for recreational & educational purposes.

The main benefits outlined in the ABC Waters Concept include:

Stormwater Management, Surrey, British Columbia

Farmers claimed that flooding of their farmlands was caused by suburban development upstream. The flooding was a result of funneled runoff directed into storm drains by impervious cove, which ran unmitigated and unabsorbed into their farmlands downstream. The farmers were awarded an undisclosed amount of money in the tens of millions as compensation. Low density and highly paved residential communities redirect stormwater from impervious surfaces and pipes to stream at velocities much greater than predevelopment rates. Not only are these practices environmentally damaging, they can be costly and inefficient to maintain. In response, the city of Surrey opted to employ a green infrastructure strategy and chose a 250-hectare site called East Clayton as a demonstration project. The approach reduced the stormwater flowing downstream and allows for infiltration of rainwater closer if not at its point of origin. In result, the stormwater system at East Clayton had the ability to hold one inch of rainfall per day, accounting for 90% of the annual rainfall. The incorporation of green infrastructure at Surrey, British Columbia was able to create a sustainable environment that diminishes runoff and to save around $12,000 per household.[2]

Nya Krokslätt, Sweden

The site of former factory “Nya Krokslätt” is situated between a mountain and a stream. Danish engineers, Ramboll, have designed a concept of slowing down and guiding storm water in the area with methods such as vegetation combined with ponds, streams and soak-away pits as well as glazed green-blue climate zones surrounding the buildings which delay and clean roof water and grey water. The design concept provides for a multifunctional, rich urban environment, which includes not only technical solutions for energy efficient buildings, but encompasses the implementation of blue-green infrastructure and ecosystem services in an urban area.[15]

Zürich, Switzerland

Since 1991, the city of Zürich has had a law stating all flat roofs (unless used as terraces) must be greened roofed surfaces. The main advantages as a result of this policy include increased biodiversity, rainwater storage and outflow delay, and micro-climatic compensation (temperature extremes, radiation balance, evaporation and filtration efficiency).[50] Roof biotopes are stepping stones which, together with the earthbound green areas and the seeds distributed by wind and birds, make an important contribution to the urban green infrastructure.[1]

Duisburg-Nord, Germany

In the old industrial area of the Ruhr District in Germany, Duisburg-Nord is a landscape park which incorporates former industrial structures and natural biodiversity. The architects Latz + Partner developed the water park which now consists of the old River Emscher, subdivided into five main sections: Klarwasserkanal (Clear Water Canal), the Emschergraben (Dyke), the Emscherrinne (Channel), the Emscherschlucht (Gorge) and the Emscherbach (Stream). The open waste water canal of the “Old Emscher” river is now fed gradually by rainwater collection through a series of barrages and water shoots. This gradual supply means that, even in lengthy dry spells, water can be supplied to the Old Emscher to replenish the oxygen levels.[51] This has allowed the canalised river bed to become a valley with possibilities for nature development and recreation. As a key part of the ecological objectives, much of the overgrown areas of the property were included in the plan as they were found to contain a wide diversity of flora and fauna, including threatened species from the red list. Another important theme in the development of the plan was to make the water system visible, in order to stimulate a relationship between visitors and the water.[1]

New York Sun Works Center, US

The Greenhouse Project was started in 2008 by a small group of public school parents and educators to facilitate hands-on learning, not only to teach about food and nutrition, but also to help children make educated choices regarding their impact on the environment. The laboratory is typically built as a traditional greenhouse on school rooftops and accommodates a hydroponic urban farm and environmental science laboratory. It includes solar panels, hydroponic growing systems, a rainwater catchment system, a weather station and a vermi composting station. Main topics of education include nutrition, water resource management, efficient land use, climate change, biodiversity, conservation, contamination, pollution, waste management, and sustainable development. Students learn the relationship between humans and the environment and gain a greater appreciation of sustainable development and its direct relationship to cultural diversity.[52]

Hammarby Sjöstad, Stockholm, Sweden

In the early 1990s, Hammarby Sjöstad had a reputation for being a run-down, polluted and unsafe industrial and residential area.[1] Now, it is a new district in Stockholm where the City has imposed tough environmental requirements on buildings, technical installations and the traffic environment. An ‘eco-cycle’ solution named the Hammarby Model, developed by Fortum, Stockholm Water Company and the Stockholm Waste Management Administration, is an integral energy, waste and water system for both housing and offices. The goal is to create a residential environment based on sustainable resource usage.[53] Examples include waste heat from the treated wastewater being used for heating up the water in the district heating system, rainwater runoff is returned to the natural cycle through infiltration in green roofs and treatment pools, sludge from the local wastewater treatment is recycled as fertiliser for farming and forestry.[1] This sustainable model has been a source of inspiration to many urban development projects including the Toronto (Canada) Waterfront, London's New Wembley, and a number of cities/city areas in China.[54]

Emeryville, California, US

The US EPA supported the City of Emeryville, California in the development of "Stormwater Guidelines for Green, Dense Redevelopment."[55] Emeryville, which is a suburb of San Francisco, began in the 1990s reclaiming, remediating and redeveloping the many brownfields within its borders. These efforts sparked a successful economic rebound. The City did not stop there, and decided in the 2000s to harness the redevelopment progress for even better environmental outcomes, in particular that related to stormwater runoff, by requiring in 2005 the use of on-site GI practices in all new private development projects. The City faced several challenges, including a high water table, tidal flows, clay soils, contaminated soil and water, and few absorbent natural areas among the primarily impervious, paved parcels of existing and redeveloped industrial sites. The guidelines, and an accompanying spreadsheet model, were developed to make as much use of redevelopment sites as possible for handling stormwater. The main strategies fell into several categories:

Gowanus Canal Sponge Park, New York, US

The Gowanus Canal, in Brooklyn, New York, is bounded by several communities including Park Slope, Cobble Hill, Carroll Gardens, and Red Hook. The canal empties into New York Harbor. Completed in 1869, the Gowanus Canal was once a major transportation route for the then separate cities of Brooklyn and New York City. Manufactured gas plants, mills, tanneries, and chemical plants are among the many facilities that operated along the canal. As a result of years of discharges, storm water runoff, sewer outflows, and industrial pollutants, the Gowanus Canal has become one of the nation's most extensively contaminated water bodies. Contaminants include PCBs, coal tar wastes, heavy metals, and volatile organics. On March 2, 2010, EPA added the Gowanus Canal to the Agency’s Superfund National Priorities List (NPL). Placing the Gowanus Canal on the list allows the Agency to further investigate contamination at the site and develop an approach to address the contamination. After March 2010 several firms tried to redesign the area surrounding the canal to meet the EPA principles. One of the proposals was the Gowanus Canal Sponge Park, suggested by DLANDstudio, an architecture and landscape architecture firm based in Brooklyn. DLANDstudio designed a public open space system that slows, absorbs, and filters surface water runoff with the goal of remediating contaminated water, activating the private canal waterfront, and revitalizing the neighborhood. The unique feature of the park is its character as a working landscape that means the ability to improve the environment of the canal over time while simultaneously supporting public engagement with the canal ecosystem. Gowanus Canal Sponge Park was honored with The American Society of Landscape Architects (ASLA) professional award in Analysis and Planning category in 2010.

Geographic Information System applications

A Geographic Information System (GIS) is a computer system for that allows users to capture, store, display, and analyze all kinds of spatial data on Earth.[57] GIS can gather multiple layers of information on one single map regarding streets, buildings, soil types, vegetation, and more.[57] Planners can combine or calculate useful information such as impervious area percentage or vegetation coverage status of a specific region to design or analyze the use of green infrastructure. The continued development of Geographic Information Systems (GIS) and their increasing level of use is particularly important in the development of Green Infrastructure plans. The plans frequently are based on GIS anaysis of many layers of geographic information.[57]

Green Infrastructure Master Plan

According to the Green Infrastructure Master Plan, developed by Hawkins Partners, civil engineers use GIS to analyze the modeling of impervious surfaces with historical Nashville rainfall data within the CSS (combined sewer system) to find the current rates of runoff. GIS are able to help planning teams analyze potential volume reductions at the specific region for green infrastructures, including water harvesting, green roofs, urban trees, and structural control measures.[58]

Implementation

Barriers

Lack of funding is consistently cited as a barrier to the implementation of green infrastructure. One advantage that green infrastructure projects offer, however, is that they generate so many benefits that they can compete for a variety of diverse funding sources. Some tax incentive programs administered by federal agencies can be used to attract financing to green infrastructure projects. Here are two examples of programs whose missions are broad enough to support green infrastructure projects:

Benefits

This Stormwater Curb Extension in Emeryville, California provides a pedestrian safety element as well as stormwater quality benefits. It uses Bay-Friendly Landscaping and recycled water for irrigation.

Some people might expect that green spaces are excessive to maintain and extravagant in nature, but high-performing green spaces can provide real economic, ecological and social benefits. For example:

In result, high performing green spaces work to create a balance between built and natural environments.

Economic effects

A study in 2012 that focused on 479 green infrastructure projects across the United States, found that 44% of green infrastructure projects reduce costs compared to the 31% that increased the costs. The most notable cost savings were due to reduced stormwater runoff and decreased heating and cooling costs.

A comprehensive green infrastructure in Philadelphia is planned to cost just $1.2 billion over the next 25 years, compared to over $6 billion for "grey" infrastructure (concrete tunnels created to move water). Under the new green infrastructure plan it is expected that:

A green infrastructure plan in New York City is expected to cost $1.5 billion less than a comparable grey infrastructure approach. Also, the green stormwater management systems alone will save $1 billion, at a cost of about $0.15 less per gallon. The sustainability benefits in New York City range from $139–418 million over the 20 year life of the project. This green plan estimates that “every fully vegetated acre of green infrastructure would provide total annual benefits of $8.522 in reduced energy demand, $166 in reduced CO2 emissions, $1,044 in improved air quality, and $4,725 in increased property value.”[6][7][60][61]

See also

References

  1. 1 2 3 4 5 6 7 Hiltrud Pötz & Pierre Bleuze (2012). Urban green-blue grids for sustainable and dynamic cities. Delft: Coop for life. ISBN 978-90-818804-0-4.
  2. 1 2 Benedict, Mark A. & McMahon, Edward T. (2006). Green Infrastructure: linking landscapes and communities
  3. 1 2 3 4 http://www.cnt.org/repository/gi-values-guide.pdf
  4. ↑ http://www.sprawlwatch.org/greeninfrastructure.pdf
  5. ↑ Gong, Y., Gallacher, J., Palmer, S. Fone, D.(2014)Neighbourhood green space, physical function and participation in physical activities among elderly men: the Caerphilly Prospective study The international journal of behavioral nutrition and physical activity 11(1):40.
  6. 1 2 http://www.citylab.com/tech/2012/04/green-infrastructure-could-cities-save-billions/1832/
  7. 1 2 http://water.epa.gov/infrastructure/greeninfrastructure/gi_economics.cfm
  8. ↑ EPA,OW, US. "Urban Runoff: Low Impact Development". www.epa.gov. Retrieved 2016-01-30.
  9. ↑ Schueler, T. 1987. Controlling Urban Runoff: A Practical Manual For Planning And Designing Urban BMPs. MWCOG. Washington, DC.
  10. ↑ via @EPA "Urban Runoff Pollution Prevention and Control Planning (Handbook)" Check |url= value (help). Retrieved 2016-01-30.
  11. ↑ The Conservation Fund, Arlington, VA. "Green Infrastructure." Accessed 2009-10-06.
  12. ↑ Maryland Department of Natural Resources, Annapolis, MD. Maryland's Green Infrastructure Assessment: A Comprehensive Strategy for Land Conservation and Restoration. May 2003.
  13. ↑ http://www.eea.europa.eu/publications/green-infrastructure-and-territorial-cohesion accessed: 09.04.13
  14. ↑ http://www.csc.noaa.gov/magazine/2009/03/article2.html accessed: 09.04.13
  15. 1 2 3 http://www.ramboll.com/projects/viewproject?projectid=F73AC734-B657-48A0-AE92-0C8A85C8992A accessed: 10.04.13
  16. ↑ U.S. Environmental Protection Agency (EPA), Washington, D.C., et al., Green Infrastructure Statement of Intent. 2007-04-19.
  17. ↑ EPA et al. "Managing Wet Weather with Green Infrastructure: Action Strategy 2008." January 2008.
  18. ↑ http://www.academia.edu/2369268/Water_purificative_landscapes_constructed_ecologies_and_contemporary_urbanism accessed: 10.04.13
  19. 1 2 http://www.un.org/waterforlifedecade/swm_cities_zaragoza_2010/pdf/02_water_uncertainties.pdf. accessed: 09.04.13
  20. ↑ http://www.un.org/waterforlifedecade/pdf/facts_and_figures_human_right_to_water_eng.pdf accessed: 09.04.13
  21. 1 2 3 4 5 6 7 8 "GREEN INFRASTRUCTURE: CITIES". The American Society of Landscape Architects. Retrieved 12 November 2014.
  22. 1 2 3 4 5 6 "Constructed treatment wetland" (PDF). Retrieved 2 December 2014.
  23. ↑ "Constructed Wetland". Architecture 2030. Retrieved 7 October 2014.
  24. ↑ "Green roof". Architecture 2030. Retrieved 7 October 2014.
  25. ↑ Mark Benedict and Edward T. McMahon (2006). Green Infrastructure, Linking Landscapes and Communities. Washington, D.C.: Island Press. ISBN 1-55963-558-4.
  26. ↑ http://www.ramboll.com/megatrend/feature-articles/in-the-cities-of-the-future-water-flows-everywhere accessed 11.04.13
  27. ↑ “Blue-Green Infrastructures”. (December 13, 2012). Topos, p.18, 21,22.
  28. ↑ Irvine KN, Warber SL. (2002). "Greening healthcare: practicing as if the natural environment really mattered." Altern Ther Health Med. 2002 Sep-Oct;8(5):76-83.
  29. ↑ Environment Agency, Bristol, UK
  30. ↑ Natural England website 2009
  31. ↑ North West Regional Assembly, Wigan, UK. "The North West Plan: Submitted Draft Regional Spatial Strategy for the North West of England." January 2006.
  32. ↑ Green Infrastructure Think Tank (GrITT), Warrington, UK. "North West Green Infrastructure Guide." September 2007.
  33. ↑ GrITT. "Green Infrastructure North West." Accessed 2009-10-06.
  34. ↑ Green Infrastructure Valuation Toolkit - www.ginw.co.uk/projects
  35. ↑ Liverpool Green Infrastructure Strategy 2010. www.ginw.co.uk/liverpool
  36. ↑ http://www.london.gov.uk/priorities/planning/publications/all-london-green-grid-spg accessed 11.04.13
  37. ↑ Green Infrastructure to Combat Climate Change - www.ginw.co.uk/climatechange
  38. ↑ Green Infrastructure Planning in the Black Country: Barrow Hill LNR and Russells Hall Hospital, Dudley - http://www.bcll.org.uk/whats_happening/documents/GreenInfrastructurePlanningintheBCBarrowHillCaseStudy.pdf
  39. ↑ EPA. "How Does Green Infrastructure Benefit the Environment?" December 15, 2008.
  40. ↑ American Rivers, Washington, D.C. "Water infrastructure: Green investments create jobs, save money." 2008-12-17.
  41. ↑ Philadelphia Water Department. "Green Stormwater Infrastructure." Accessed 2010-04-27.
  42. ↑ State of Maryland, 2001. “Maryland GreenPrint FAQ’s.” Accessed 2011-01-31.
  43. ↑ http://cfpub.epa.gov/npdes/home.cfm?program_id=298
  44. ↑ http://www.epa.gov/npdes/pubs/gi_agenda_protectwaters.pdf
  45. ↑ http://www.epa.gov/npdes/pubs/gi_partner_organizations.pdf
  46. ↑ "Reducing Damage from Localized Flooding." U.S. Federal Emergency Management Agency, 2005.
  47. ↑ http://www.pub.gov.sg/abcwaters/abcwatersdesignguidelines/Pages/ABCDesignGuidelines.aspx accessed 11.04.13
  48. ↑ Lemma, A. Green Infrastructure in Fragile States, October 2012, Overseas Development Institute http://partnerplatform.org/?5amvj9gc
  49. ↑ http://www.pub.gov.sg/abcwaters/abcwatersdesignguidelines/Pages/ABCDesignGuidelines.aspx
  50. ↑ http://www.stadt-zuerich.ch/content/ted/de/index/gsz/angebote_u_beratung/beratung/dachbegruenungen.html
  51. ↑ http://en.landschaftspark.de/architecture-nature/water-concept accessed: 12.04.13
  52. ↑ http://nysunworks.org/thegreenhouseproject accessed: 12.04.13
  53. ↑ http://www.hammarbysjostad.se/ accessed: 15.04.13
  54. ↑ http://www.cleanenergyawards.com/no_cache/top-navigation/nominees-projects/nominee-detail/singleprintview/project/66/ accessed: 15.04.13
  55. ↑ http://www.epa.gov/smartgrowth/emeryville.htm
  56. ↑ http://bayfriendlycoalition.org
  57. 1 2 3 "GIS (geographic information system)". National Geographic. Retrieved 4 November 2014.
  58. ↑ "ASLA 2013 Professional Awards, Green Infrastructure Master Plan".
  59. ↑ http://water.epa.gov/infrastructure/greeninfrastructure/gi_funding.cfm
  60. ↑ http://www.asla.org/ContentDetail.aspx?id=43535
  61. ↑ http://water.epa.gov/infrastructure/greeninfrastructure/gi_costbenefits.cfm

Further reading

External links

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