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Hållbar dagvattenhantering i Stockholms stad : en riskhanteringsanalys med avseende på långsiktig hållbarhet av Stockholms stads dagvattenhantering i urban miljö

Mellquist, Tara LU (2015) In Examensarbete INES NGEK01 20121
Dept of Physical Geography and Ecosystem Science
Abstract
The City of Stockholm can be characterized as evolving and changing while simultaneously, the region is being affected by climate change in accordance to RCP 4.5 and RCP 8.5. According to climate scenarios one of the effects of a changing climate in the region of Stockholm is an increase in precipitation and changes in precipitation patterns. This has prompted an interest in acquiring an in-depth understanding of climate adaption measures in the City of Stockholm. The purpose of this thesis has been to investigate, from a climate change perspective, whether the municipality of Stockholm’s surface runoff management is sustainable in the region’s urban environment. Sustainable surface runoff management can be defined by the interplay between... (More)
The City of Stockholm can be characterized as evolving and changing while simultaneously, the region is being affected by climate change in accordance to RCP 4.5 and RCP 8.5. According to climate scenarios one of the effects of a changing climate in the region of Stockholm is an increase in precipitation and changes in precipitation patterns. This has prompted an interest in acquiring an in-depth understanding of climate adaption measures in the City of Stockholm. The purpose of this thesis has been to investigate, from a climate change perspective, whether the municipality of Stockholm’s surface runoff management is sustainable in the region’s urban environment. Sustainable surface runoff management can be defined by the interplay between its capacity, the urban environment and water quality. The need for climate change adaptation is based on the level of risk the municipality faces as a result of climate change. Therefore, the probability of altered precipitation patterns, the degree of exposure facing increased precipitation and the city's vulnerability has been analyzed to determine Stockholm's climate risks. Scenarios illustrating the probability of altered precipitation patterns are based on RCP 4.5 and RCP 8.5, which indicate an increase in precipitation and extreme weather in the future. Exposure and vulnerability are increased due to urban densification caused by a rapid increase in population, as well as impacts on existing rivers and inland water bodies, technical supply systems and infrastructure. The City of Stockholm’s surface runoff management consists of various forms of open surface runoff solutions and the municipality’s conventional surface runoff system. As the study shows the municipality is characterized by increased climate risks, therefore it is essential the surface runoff management functions to reduce negative effects of climate change. In accordance with the Swedish Water & Wastewater Association guidelines, the sewage system in the municipality is dimensioned to manage rainfall with a return period of 10-years (based upon precipitation between years 1961-1990), which in turn results in precipitation exceeding the return period of 10-years or more unable to infiltrate Stockholm's existing surface runoff systems, causing the sewage system to flood. The reason to this is most likely the lack of measures taken to increase the capacity of the municipality’s surface runoff systems or sufficiently integrating open surface runoff systems in the urban environment. To achieve sustainability of the City of Stockholm’s surface runoff management further improvements are required such as increased use of height subsidence, fewer paved surfaces and more open surface runoff systems. (Less)
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author
Mellquist, Tara LU
supervisor
organization
course
NGEK01 20121
year
type
M2 - Bachelor Degree
subject
keywords
sewage system, open surface runoff, RCP, surface runoff, City of Stockholm, urban densification, paved surfaces
publication/series
Examensarbete INES
report number
356
language
Swedish
id
7767269
date added to LUP
2015-08-27 13:22:53
date last changed
2015-08-27 13:22:53
@misc{7767269,
  abstract     = {The City of Stockholm can be characterized as evolving and changing while simultaneously, the region is being affected by climate change in accordance to RCP 4.5 and RCP 8.5. According to climate scenarios one of the effects of a changing climate in the region of Stockholm is an increase in precipitation and changes in precipitation patterns. This has prompted an interest in acquiring an in-depth understanding of climate adaption measures in the City of Stockholm. The purpose of this thesis has been to investigate, from a climate change perspective, whether the municipality of Stockholm’s surface runoff management is sustainable in the region’s urban environment. Sustainable surface runoff management can be defined by the interplay between its capacity, the urban environment and water quality. The need for climate change adaptation is based on the level of risk the municipality faces as a result of climate change. Therefore, the probability of altered precipitation patterns, the degree of exposure facing increased precipitation and the city's vulnerability has been analyzed to determine Stockholm's climate risks. Scenarios illustrating the probability of altered precipitation patterns are based on RCP 4.5 and RCP 8.5, which indicate an increase in precipitation and extreme weather in the future. Exposure and vulnerability are increased due to urban densification caused by a rapid increase in population, as well as impacts on existing rivers and inland water bodies, technical supply systems and infrastructure. The City of Stockholm’s surface runoff management consists of various forms of open surface runoff solutions and the municipality’s conventional surface runoff system. As the study shows the municipality is characterized by increased climate risks, therefore it is essential the surface runoff management functions to reduce negative effects of climate change. In accordance with the Swedish Water & Wastewater Association guidelines, the sewage system in the municipality is dimensioned to manage rainfall with a return period of 10-years (based upon precipitation between years 1961-1990), which in turn results in precipitation exceeding the return period of 10-years or more unable to infiltrate Stockholm's existing surface runoff systems, causing the sewage system to flood. The reason to this is most likely the lack of measures taken to increase the capacity of the municipality’s surface runoff systems or sufficiently integrating open surface runoff systems in the urban environment. To achieve sustainability of the City of Stockholm’s surface runoff management further improvements are required such as increased use of height subsidence, fewer paved surfaces and more open surface runoff systems.},
  author       = {Mellquist, Tara},
  keyword      = {sewage system,open surface runoff,RCP,surface runoff,City of Stockholm,urban densification,paved surfaces},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbete INES},
  title        = {Hållbar dagvattenhantering i Stockholms stad : en riskhanteringsanalys med avseende på långsiktig hållbarhet av Stockholms stads dagvattenhantering i urban miljö},
  year         = {2015},
}