Green roofs in Vienna, Austria https://demo-water.devel5cph.eea.europa.eu/freshwater/admin/resources/nwrm-imported/nwrm-case-studies/green-roofs-vienna-austria https://demo-water.devel5cph.eea.europa.eu/freshwater/admin/++resource++plone-logo.svg Green roofs in Vienna, Austria Title Green roofs in Vienna, Austria Description Preview image No image Preview image caption Creators fullname Laszlo Cseh Contributors fullname NWRM Site information Climate zone cool temperate dry Mean rainfall 500 Mean rainfall unit mm/year Average temperature 11,5 Mean runoff 300 Mean runoff unit 450 - 600 mm Type Case Study Info Light or indepth? In-depth Average slope range 1-20% Vegetation class Depends on the individual project for intensive green roofs. Extensive green roofs consist of mosses and grass. Design and implementations Application scale City Installation date 2003 Lifespan 35 Performance timescale < 1 year Area (ha) 1,6 Area subject to Land use change or Management/Practice change (ha) 1,6 Design capacity description The water retention capacity of a green roof depends on several factors such as: intensity of a precipitation event, annual precipitation, and amount of precipitation events. Moreover the individual design of the roof (plant composition, soil type and thickness of soil layer) determines the water retention capacity. Constraints Green roofs can be installed up to a slope of less than 45°. Intensive green roofs require an adaptation of the statics of the roof. Favourable preconditions Lack of land, increasing sealing and thus in creasing amount of rain water. Contractural arrangements 0 Design contractual arrangement No data Design consultation activity Activity stage Key issues Name Comments Implementation phase in general the publicity for the project is not sufficient. It is criticised that people already have to know the term "green roof" to find information. The public don't know about the manifold advantages of green roofs. It is just reduced to a garden information material Design land use change No data Design authority Authority type Role Responsibility Name Comments Other Other 1. Wiener Umweltschutzabteilung (city†™s authority for environmental protection) Initiation of the project, subsidies for house owners Other Other 2. die umweltberatung Facility of Vienna†™s adult education center. Consulting office for a near-natural life style. Publicity and information material Other 3. Verband fí¼r Bauwerksbegrí¼nung (Association for greening buildings) Austrian section of the European Federation of Green Roof Associations Other Publicity, implementation of green roofs, certification system for green roofs, Creation of technical standards Lessons, risks, implications Key lessons Green Roofs are able to provide a lot of benefits such as climate regulation, water retention, or "island habitats" for plants and animals. These advantages have to be communicated more intensively to the public. Green roofs cause only little additional costs compared to a traditional flat roof. These costs are often compensated by the longer lifespan of the roof and energy savings Success factor(s) Success factor type Success factor role Comments Attitude of relevant stakeholders secondary factor Many firms specialised on the construction of green roofs. They organised together with architects on national and european level to support the implementation of green roofs Attitude of decision makers main factor Adaptation of the building code, information of the public. Existing technical standards main factor Legal framework for the construction of green roof and liabilities of firms, architectures and house owners. Financing possibilities secondary factor The local authorities support the construction of green roofs with 8-25€/m² and with a maximum of 2200€. Financing Financing type Comments Local funds Subsidies of the city of Vienna. Private funds Fortune of the house owner. Barrier Barrier type Barrier role Comments Expected maintenance needs main barrier House owners are often afraid that the installation of a green roof is combined with high costs. However this is not the case for extensive green roofs and the additional costs are often balanced by energy savings and the longer life span of the roof Other main barrier Lack of communication. Citizens are not sufficiently informed about the many advantages of green roofs. The majority thinks, it is just another kind of garden Missing regulatory support secondary barrier Architects/planners are liable for 30 years for the construction of a green roof. Since there is the risk that they aren't leakproof, architects partly refuse to consider green roofs in their plannings Driver Driver type Driver role Comments Legal obligations main driver Technical standard for building green roofs. The technical code of Vienna gives the legal framework for green buildings. Availability of subsidies main driver The local authorities support the construction of green roofs with 8-25€/m² and with a maximum of 2200€. Organisation committed to it main driver Both organisations inform the public about the advantages of green roofs. Moreover the Verband für Bauwerksbegrünung is composed of planers, architectures and specialised firms. They developed a certification system for green roofs and consult house owners and planners. Financing share Financing share type Share Comments Private funds This depends on the individual roof. Policy, general governance Policy description The more people are moving to cities, the more surface needs to be sealed and green areas are disappearing. In Austria 15 to 25 ha of usable ground get sealed every day. However green areas are important for recreation, mood lifting and health. Green roofs are a possibility to regain green areas and offer a manifold of advantages. A cadastre of potential roofs was developed. It proved that 20% of Vienna's roofs could become green roofs. Policy target Target purpose Runoff control Peak-flow reduction Groundwater Recharge Pollutants Removal Improved Biodiversity Oher Societal Benefits Policy pressure No data Policy area No data Policy impact No data Policy wider plan No data Policy requirement directive No data Socio economic Direct benefits information Energy savings and a longer lifespan compared to a traditional flat roof. Savings meet the additional costs of implementation and maintenance. Costs investment information 0,31 Euros/m2 for extensive green roof with a slope less than 10° on a multi-family house with 7 floors. Costs capital information 0,31 Euros/m2 for the implementation of the green roof, without potetntial adaptation of the roof's statics. Costs land acquisition unit € (total value) Costs operation maintenance 0,19 Euros/m2 for an inspection twice a year, removal of growing trees, cutting grass. Costs total information 0,5 Euros/m2 Compensations annual information Financial support given by the city's authorities only once: 8-25€/m² up to 2200€. Ecosystem improved biodiversity 1 Information on Ecosystem improved biodiversity Green roofs can act as bridge between different habitats and populations. Birds find there material for building nests. Some observations even document that some ground breeding species take green roofs as new habitat. Insects find new food/habitat resources with the green roofs. Ecosystem provisioning services 1 Information on Ecosystem provisioning services Intensive green roofs can serve as garden and deliver fruits and vegetables. Ecosystem impact climate regulation Impact on GHGs (net emissions and storage) including soil carbon Information on Ecosystem impact climate regulation Vegetation stores CO² by photosynthesis. The increased evapotranspiration enhance dust adsorption, leads to an ambient temperature in the underlying rooms and takes up the summer heat of a city. Biophysical impacts Information on retained water The microclimate improves. That means: the increased evapotranspiration leads to an ambient temperature. The underlying rooms profit from this "natural air condition". Water quality overall improvements Positive impact-WQ improvement Information on Water quality overall improvements Rain water is filtered by the vegetation. Information on Water quality Improvements (N) Reduction by more than 90%. Information on Water quality Improvements (Cu) Reduction by more than 90%. Information on Water quality Improvements (Zn) Reduction by 16%. Soil quality overall soil improvements Not relevant for this application Monitoring maintenance Monitoring impacts effects 1 Monitoring location Edge of Field/Plot Monitoring parameters During the project the retained amount of rain water was measured. Moreover, the pollutants removal was documented as well as the composition of plant and animal population. The temperature was recorded in the surroundings of the green roofs Performance Performance impact estimation method Catchment outlet Performance impact estimation information Collection of the runoff from a green roof and a traditional roof during a precipitation event. Measures Green Roofs sources „Logisch gedacht ist ökologisch bedacht" Ein Leitfaden für die Dachbegrünung dachgrün Nwrm type In-depth Nwrm geolocation 16.373819,48.208174 General National Id Austria_03 Site name City of Vienna Summary Since 2003 the city of Vienna supports financially the implementation of green roofs with 8-25 € per m². The maximum subsidy can be 2200 €. Until 2010 16000 m² roof were transformed and 150 000 € invested. NUTS Code Wien RBD code AT1000 Transboundary 0 Data provider Sabine Tutte, ACTeon Longitude 16.373819 Latitude 48.208174 EEA core metadata Topics Temporal coverage {} Geographical coverage {} Publisher Rights Other organisations involved Add sources for the data used {} Contents cs-at-2-final_version.pdf
Green roofs in Vienna, Austria https://demo-water.devel5cph.eea.europa.eu/freshwater/admin/resources/nwrm-imported/nwrm-case-studies/green-roofs-vienna-austria https://demo-water.devel5cph.eea.europa.eu/freshwater/admin/++resource++plone-logo.svg Green roofs in Vienna, Austria Title Green roofs in Vienna, Austria Description Preview image No image Preview image caption Creators fullname Laszlo Cseh Contributors fullname NWRM Site information Climate zone cool temperate dry Mean rainfall 500 Mean rainfall unit mm/year Average temperature 11,5 Mean runoff 300 Mean runoff unit 450 - 600 mm Type Case Study Info Light or indepth? In-depth Average slope range 1-20% Vegetation class Depends on the individual project for intensive green roofs. Extensive green roofs consist of mosses and grass. Design and implementations Application scale City Installation date 2003 Lifespan 35 Performance timescale < 1 year Area (ha) 1,6 Area subject to Land use change or Management/Practice change (ha) 1,6 Design capacity description The water retention capacity of a green roof depends on several factors such as: intensity of a precipitation event, annual precipitation, and amount of precipitation events. Moreover the individual design of the roof (plant composition, soil type and thickness of soil layer) determines the water retention capacity. Constraints Green roofs can be installed up to a slope of less than 45°. Intensive green roofs require an adaptation of the statics of the roof. Favourable preconditions Lack of land, increasing sealing and thus in creasing amount of rain water. Contractural arrangements 0 Design contractual arrangement No data Design consultation activity Activity stage Key issues Name Comments Implementation phase in general the publicity for the project is not sufficient. It is criticised that people already have to know the term "green roof" to find information. The public don't know about the manifold advantages of green roofs. It is just reduced to a garden information material Design land use change No data Design authority Authority type Role Responsibility Name Comments Other Other 1. Wiener Umweltschutzabteilung (city†™s authority for environmental protection) Initiation of the project, subsidies for house owners Other Other 2. die umweltberatung Facility of Vienna†™s adult education center. Consulting office for a near-natural life style. Publicity and information material Other 3. Verband fí¼r Bauwerksbegrí¼nung (Association for greening buildings) Austrian section of the European Federation of Green Roof Associations Other Publicity, implementation of green roofs, certification system for green roofs, Creation of technical standards Lessons, risks, implications Key lessons Green Roofs are able to provide a lot of benefits such as climate regulation, water retention, or "island habitats" for plants and animals. These advantages have to be communicated more intensively to the public. Green roofs cause only little additional costs compared to a traditional flat roof. These costs are often compensated by the longer lifespan of the roof and energy savings Success factor(s) Success factor type Success factor role Comments Attitude of relevant stakeholders secondary factor Many firms specialised on the construction of green roofs. They organised together with architects on national and european level to support the implementation of green roofs Attitude of decision makers main factor Adaptation of the building code, information of the public. Existing technical standards main factor Legal framework for the construction of green roof and liabilities of firms, architectures and house owners. Financing possibilities secondary factor The local authorities support the construction of green roofs with 8-25€/m² and with a maximum of 2200€. Financing Financing type Comments Local funds Subsidies of the city of Vienna. Private funds Fortune of the house owner. Barrier Barrier type Barrier role Comments Expected maintenance needs main barrier House owners are often afraid that the installation of a green roof is combined with high costs. However this is not the case for extensive green roofs and the additional costs are often balanced by energy savings and the longer life span of the roof Other main barrier Lack of communication. Citizens are not sufficiently informed about the many advantages of green roofs. The majority thinks, it is just another kind of garden Missing regulatory support secondary barrier Architects/planners are liable for 30 years for the construction of a green roof. Since there is the risk that they aren't leakproof, architects partly refuse to consider green roofs in their plannings Driver Driver type Driver role Comments Legal obligations main driver Technical standard for building green roofs. The technical code of Vienna gives the legal framework for green buildings. Availability of subsidies main driver The local authorities support the construction of green roofs with 8-25€/m² and with a maximum of 2200€. Organisation committed to it main driver Both organisations inform the public about the advantages of green roofs. Moreover the Verband für Bauwerksbegrünung is composed of planers, architectures and specialised firms. They developed a certification system for green roofs and consult house owners and planners. Financing share Financing share type Share Comments Private funds This depends on the individual roof. Policy, general governance Policy description The more people are moving to cities, the more surface needs to be sealed and green areas are disappearing. In Austria 15 to 25 ha of usable ground get sealed every day. However green areas are important for recreation, mood lifting and health. Green roofs are a possibility to regain green areas and offer a manifold of advantages. A cadastre of potential roofs was developed. It proved that 20% of Vienna's roofs could become green roofs. Policy target Target purpose Runoff control Peak-flow reduction Groundwater Recharge Pollutants Removal Improved Biodiversity Oher Societal Benefits Policy pressure No data Policy area No data Policy impact No data Policy wider plan No data Policy requirement directive No data Socio economic Direct benefits information Energy savings and a longer lifespan compared to a traditional flat roof. Savings meet the additional costs of implementation and maintenance. Costs investment information 0,31 Euros/m2 for extensive green roof with a slope less than 10° on a multi-family house with 7 floors. Costs capital information 0,31 Euros/m2 for the implementation of the green roof, without potetntial adaptation of the roof's statics. Costs land acquisition unit € (total value) Costs operation maintenance 0,19 Euros/m2 for an inspection twice a year, removal of growing trees, cutting grass. Costs total information 0,5 Euros/m2 Compensations annual information Financial support given by the city's authorities only once: 8-25€/m² up to 2200€. Ecosystem improved biodiversity 1 Information on Ecosystem improved biodiversity Green roofs can act as bridge between different habitats and populations. Birds find there material for building nests. Some observations even document that some ground breeding species take green roofs as new habitat. Insects find new food/habitat resources with the green roofs. Ecosystem provisioning services 1 Information on Ecosystem provisioning services Intensive green roofs can serve as garden and deliver fruits and vegetables. Ecosystem impact climate regulation Impact on GHGs (net emissions and storage) including soil carbon Information on Ecosystem impact climate regulation Vegetation stores CO² by photosynthesis. The increased evapotranspiration enhance dust adsorption, leads to an ambient temperature in the underlying rooms and takes up the summer heat of a city. Biophysical impacts Information on retained water The microclimate improves. That means: the increased evapotranspiration leads to an ambient temperature. The underlying rooms profit from this "natural air condition". Water quality overall improvements Positive impact-WQ improvement Information on Water quality overall improvements Rain water is filtered by the vegetation. Information on Water quality Improvements (N) Reduction by more than 90%. Information on Water quality Improvements (Cu) Reduction by more than 90%. Information on Water quality Improvements (Zn) Reduction by 16%. Soil quality overall soil improvements Not relevant for this application Monitoring maintenance Monitoring impacts effects 1 Monitoring location Edge of Field/Plot Monitoring parameters During the project the retained amount of rain water was measured. Moreover, the pollutants removal was documented as well as the composition of plant and animal population. The temperature was recorded in the surroundings of the green roofs Performance Performance impact estimation method Catchment outlet Performance impact estimation information Collection of the runoff from a green roof and a traditional roof during a precipitation event. Measures Green Roofs sources „Logisch gedacht ist ökologisch bedacht" Ein Leitfaden für die Dachbegrünung dachgrün Nwrm type In-depth Nwrm geolocation 16.373819,48.208174 General National Id Austria_03 Site name City of Vienna Summary Since 2003 the city of Vienna supports financially the implementation of green roofs with 8-25 € per m². The maximum subsidy can be 2200 €. Until 2010 16000 m² roof were transformed and 150 000 € invested. NUTS Code Wien RBD code AT1000 Transboundary 0 Data provider Sabine Tutte, ACTeon Longitude 16.373819 Latitude 48.208174 EEA core metadata Topics Temporal coverage {} Geographical coverage {} Publisher Rights Other organisations involved Add sources for the data used {} Contents cs-at-2-final_version.pdf
