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TALLINN STORMWATERS STRATEGY

TALLINN STORMWATERS STRATEGY. SITUATION TODAY. Tallinn does not have a storm strategy. We need comprehensive storm water solution with catchment areas together with economic analysis. Two main problems. increased flooding storm pollutants migrate to the Baltic Sea. catchment area.

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TALLINN STORMWATERS STRATEGY

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  1. TALLINN STORMWATERS STRATEGY

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

  3. Two main problems • increased flooding • storm pollutants migrate to the Baltic Sea

  4. catchment area

  5. Flood natural factors are: • Sea water level fluctuations • Filtering from Ülemiste Lake • Groundwater leach from cliff slope • Clayey soils, low soil angle of incidence

  6. 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.

  7. 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.

  8. Over the years has fallen in storm water outlets organic (BOD) and the content of oil products • The same can’t be said of nitrogen and phosphorus, which are known biogenic elements in water contribute to eutrophication and algal proliferation

  9. TODAY • TALLINN STORMWATER STRATEGY to 2030 • WE ARE ON PROCESS WITH STORMWATER STRATEGY

  10. 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.

  11. 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.

  12. THANK YOU Thank you !

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