TALLINN STORMWATERS STRATEGY

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TALLINN STORMWATERS STRATEGY
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SITUATION TODAY

• Tallinn does not have a storm strategy.
• We need comprehensive storm water solution with
  catchment areas together with economic analysis.

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Two main problems

• increased flooding
• storm pollutants migrate to the Baltic Sea

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catchment area
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Flood natural factors are

• Sea water level fluctuations
• Filtering from Ülemiste Lake
• Groundwater leach from cliff slope
• Clayey soils, low soil angle of incidence

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The flooding has increased during the last 20
years it is caused by human activities

• Poor condition of ditches and mismanaged systems.
• Increasing the paved surfaces and decreasing of
  the filtration areas.
• Many new develop areas drainage are improperly
  designed or constructed.
• Planting decline.
• Maximum flow quantity/velocity optimizing systems
  - continuously decreasing proportion of ditches,
  streams and the filtration areas.

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Tallinn have five major storm water outlet to the
Tallinn Gulf

• on average 467 tonnes of suspended solids,
• 102 tonnes of BOD7,
• 113 tonnes of nitrogen and
• 4.03 tonnes of phosphorus.

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• Over the years has fallen in storm water outlets
  organic (BOD) and the content of oil products
• The same cant be said of nitrogen and
  phosphorus, which are known biogenic elements in
  water contribute to eutrophication and algal
  proliferation

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TODAY

• TALLINN STORMWATER STRATEGY to 2030
• WE ARE ON PROCESS WITH STORMWATER STRATEGY

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The strategy aims are

• Elimination and prevention of floods.
• Minimizing biogenic elements in storm water.
• Using storm water as a resource.
• Maintain groundwater levels.
• Ensuring drainage area where it is necessary.

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• Compose comprehensive storm water solution with
  catchment areas together with economic analysis.
• Storm water drainage should be reasonably estate
  (taxation).
• Should implement the principle that the ownership
  of land pays for storm water what leads to the
  sewages.
• Awareness-raising work of city residents and
  developers
• Develops storm water treatment plants and
  operating facilities purifiers - ponds, wetlands,
  a cascade, the construction and maintenance of
  them.

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THANK YOU
Thank you !