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GIS application for mean sea level estimation


Lowest construction height in the Baltic Sea coast: 230cm local wave height ... Distance from the sea shore according to Helsinki building code is 20 meters ... – PowerPoint PPT presentation

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Title: GIS application for mean sea level estimation

Incorporating SLR and flood scenarios in
Helsinki city planning3.3.2005Samrit Luoma
(Geological Survey of Finland) Samuli
Lehtonen(Centre for urban and regional studies,
Helsinki university of technology)
The lowest recommendable height for building in
Finland in selected cities
  • Including the minimum wave action
  • Source Kahma et al. 1998
  • SEAREG start, already guidelines in Finland

  • Flooding situation in Helsinki
  • Max. sea level 136cm in 1990 (1887-1997)
  • New max 9.1.2005 151cm
  • Consequences
  • Water entering to cellars in low lying areas
  • Corrosion of heating pipelines
  • Rain water flow in the sewer system

Prevention of flooding in Helsinki
  • The SYKE guidelines into Helsinki building code
    2000. Lowest construction height in the Baltic
    Sea coast 230cm local wave height from 30cm
    and up (formerly used guideline 120cm)
  • Distance from the sea shore according to Helsinki
    building code is 20 meters
  • If built under these limits constructions must be
    equipped with a pumping system other measures
    against possible water damages

Low lying areas in Helsinkirecently built or
areas under construction
Arabianranta (under construction)
Pikku-Huopalahti (built 90s)
Vuosaari (mostly built)
Herttoniemenranta (mostly built)
Ruoholahti (built 90s)
Lauttasaari (built 90s)
Downtown of Helsinki in 25th August 1967. Long
lasting storm caused flooding of sea-water to the
low laying areas in City of Helsinki.
Helsinki Market square
29.12.2003 sea level 117cm
February 1990 sea level 122cm
Winter storm January 2005
source Finnish marine research institute 2005
Winter storm January 2005 (2)
Helsinki market square 9.1.2005
Winter storm January 2005 (3)
Water incoming via overflow pipes
Flooding of a green area, note the bench
Recently built housing approx. 100m in-shore
Winter storm January 2005 (4)
Arabianranta construction material floating 200m
Winter storm January 2005 (5)
  • Marjaniemi

Winter storm January 2005 (6)media analysis
  • Identifying stakeholders in / by media
  • Before the winter storm
  • Finnish Institute of Marine Research
  • Shipowners
  • Coast guards on the Gulf of Finland and in
    Western Finland
  • Finnish road administration
  • Fortum, energy company
  • The Finnish defence forces
  • Departments of the City
  • City of Helsinki Rescue department
  • Helsinki Water
  • Port of Helsinki
  • City of Helsinki, Public works department
  • City of Helsinki, environment centre
  • Volunteer fire-brigade other Voluntary
    emergency groups
  • Ministry of internal affairs
  • Presidential palace
  • Police forces

Winter storm January 2005 (7)media analysis
  • After the winter storm (in addintion to before
    the storm)
  • Radiation and nuclear safety authority Finland
  • Cruise guests
  • Residents
  • Insurance companies
  • Uusimaa regional environment centre
  • Finnish road administration, traffic services
  • City of Helsinki - Real Estate Department
  • City council of Helsinki
  • Helsinki city, city planning department
  • Ruskeasuo allotment garden association
  • Ministry of trade and industry
  • VTT Technical Research Centre of Finland
  • Officers in charge of the planning and building
    permits in city and communal level
  • Construction companies
  • The Finns
  • Prime Minister Matti Vanhanen
  • Defence forces
  • Nature

Organisational setting in the city administration
Science, knowledge production
Rescue department
core of responsibility on technical infrastrucure
General coping capacity in Helsinki
  • functioning guidelines
  • guidelines gt possibility to cope with areas to be
  • problems gt old, already built areas,
  • coping with issues of responsibility in olders
  • responsibilities are not very well thought out
    (owner pays? planners fault?)
  • central role of city planning department
  • existing networks for adaptation
  • administrative groups for emergency situations
    and e.g. underground constructions
  • possibility to use these networks as a tool for
    knowledge transfer and adaptation
  • no need for new organisational taskforces gt use
    the ones already functioning gt should be open for
    new needs
  • the awareness is there
  • balancing between adaptation / political needs /
    user needs

Two examples of dealing with possible flooding in
Low lying greenfield floods every year planned to
be flooded
Absolute barrier, prevents the recreational
use of shoreline
Dealing with sea level rise or flood prevention
in planning
  • peoples needs and wants
  • solutions for planning well
  • not only new guidelines or regulations
  • combination of needs adaptation measures

Helsinki Energy
The total length of the district heating network
is 1,171km
Helsinki Water - Sewer Network
Combined sewer network area
  • 264 (15) of total 1760km of sewer network is a
    combined sewer network.

Helsinki Water
Underground developments in Helsinki
  • Multi-utility tunnel water district heating
    district cooling pipelines electric and
    telecommunication cables.
  • 3.6 km from Kamppi-Erottaja-Kruununhaka to be
    excavated by end 2005.
  • no impact from the sea level rise to the

Low lying areas in Helsinkiplanned developments
New harbour (partly built, planned)
Töölönlahti (recreation/planned)
Kalasatama / Sompasaari (planned)
Jätkäsaari (planned)
Low lying areas in Helsinkiold areas
Töölönlahti (recreation/planned)
Kruununhaka (urban residential, basement
Kluuvi (CBD)
Kauppatori market square
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