TALLINN STORMWATERS STRATEGY. SITUATION TODAY Tallinn does not have a storm strategy. We need comprehensive storm water solution with catchment areas.

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Presentation transcript:

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

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

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.

Tallinn have five major storm water outlet to the Tallinn Gulf on average 467 tonnes of suspended solids, 102 tonnes of BOD 7, 113 tonnes of nitrogen and 4.03 tonnes of phosphorus.

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

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

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.

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.

THANK YOU Thank you !