KLAS – CLIMATE ADAPTION STRATEGY – EXTREME RAINFALL EVENTS

 

Background:

In fall 2012, the senator of environment, construction and transport of the Hanseatic city of Bremen tasked the ISB with the scientific supervision of the BMU flagship project “KLAS - Climate Adaption Strategy for Extreme Rainfall Events”. This project aims to develop a climate adaption strategy for extreme rainfall events in order to adapt Bremen to the risks of such events, thus preparing the city for the future in the long run. For this end, the ISB will cooperate with numerous local stakeholders to develop integrated strategies and measures which will help to reduce the effects of extreme rainfall events and to manage the risks involved.

Within project KLAS, the Institute for Urban and Transport Planning was assigned to the control and supervision of Area 2 (urban planning, infrastructure and rainwater management). This part of the project most of all aims to identify urban areas within the city of Bremen at risk of heavy rain and subsequently to develop integrated strategies and measures for the future handling of extreme rainfall events in the context of urban development and other planning processes.

Aims of the project:

Project KLAS aims to develop a climate adaption strategy for extreme rainfall events in order to adapt Bremen to the risks of such events, thus preparing the city for the future in the long run. For this purpose, integrated strategies and measures will be developed which will help to reduce the effects of extreme rainfall events and to manage the risks involved.

Project KLAS researches practical technological measures to improve risk adaption for events of extreme rainfall in order to reduce obstacles occurring in critical areas during such events. The first step to achieve this is to identify topographically lower areas at risk of flooding. In these areas, the contributors of project KLAS will check whether any technological measures can be taken to reduce damages and obstructions during extreme rainfall. Possible measures are partially a public matter, but private property owners are also asked to adapt their properties accordingly in order to protect them from damage. In the long run the project furthermore promotes greater water-sensitivity in urban planning and development.

Content and structure:

Component 1: Analysis: Vulnerable areas of the settlement and of the transport network will first be identified by means of urban risk analysis and then blended with the results of the hazard analysis (flow path, critical depressions). This results in maps of areas that are likely at risk which will then be given to the city management as a planning tool for flooding precautions. During the analysis of the urban area, interviews and a stakeholder analysis will determine how and at which point drainage concerns (particularly flood safety) are already being considered in Bremen’s urban planning in order to come to an initial conclusion about deficits and possible improvements.

Component 2: Developing strategies and measures: Building on the results of the analysis, integrated strategies, tools, and structural measures will be developed so as to reduce risks and vulnerabilities to extreme rainfall events in Bremen in cooperation with local stakeholders. The results will be demonstrated with pilot projects.

Component 3: Recommended action: In the final phase of the project the results of the analyses, workshops and task forces will be collected and presented as a recommended plan of action for water-sensitive urban planning. The focus will be on questions of general goals and milestones to set for Bremen as well as on their time frame and how to prioritize them. Furthermore, project KLAS will result in clear, practical conclusions about the instruments required, possible changes in procedure, reasonable measures, and necessary changes to the legal framework in Bremen.

Sponsors:

KLAS is supported by the BMU’s (Federal Ministry for the Environment, Nature Conversation, Building and Nuclear Safety) program of adaptation to climate change. Area 3: Regional flagship projects and (inter)regional units for adaptation to the results of climate change.

Project partners:

  • Environmental management of Bremen, division for urban drainage
  • Senator for environment, building and transport of the Hanseatic city of Bremen
  • hanseWasser
  • Dr. Pecher AG, Erkrath
  • aqua consult Ingenieur GmbH, Hanover

Contact at the ISB:

Jan Benden, Carolin Dietrich

Further information:

www.klas-bremen.de