Case Kuninkoja- Stormwater investment and stormwater programme of Turku 11.11.11 Tallinn Olli-Pekka Mäki.

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Presentation transcript:

Case Kuninkoja- Stormwater investment and stormwater programme of Turku Tallinn Olli-Pekka Mäki

Management of stormwaters Traditional Flood prevention Drying Complete Returning water cycle close to natural: Reduction Detention Vaporation Storage Infiltration Based on drainage areas Utilisation Natural Solutions using biodiversity: Green roofs Ponds Wetlands Biofilters Vegetation Effects on scenery and waterbody

Background information Kuninkoja –brook: Drainage area 27 km 2 Length of the main channel 7 km Built area 30 % Fields 9 % Forest 40 %

Locally valuable scenery element Diverse habitat: bogs, meadows, groves (oak, ash) 10 fish species have been observed ~1 km of 7 km channel length is constructed area and water flows in pipes

Cluster of space demanding shops have been build in three years ~ m 2 No measures taken to delay the stormwater runoff to Kuninkoja Flooding has increased Situates outside city border

Stormwater planning and investment Target is to –prevent the disadvantages of flooding –increase the use of surface water elements in planning and construction of parks and greenery areas –decrease rapid water level variations in brook –maintain biodiversity Environmental and City Planning Department responsible for planning Real Estate Department resbonsible for constructing and maintaining Budget of stormwater measure is ~ € Construction during 2012

Stormwater plan Flood reservoir of ~2000 m 3 Planting of wetland plant species Meandering of channel

Thank you!

ParameterAverageRange Cond.40 mS/m pH7,87,1-8 SS7,6 mg/l< Coliform2100 /100ml BOD 7 1,2 mg/l0,8 - 1,5 P tot 47 µg/l N tot 1650 µg/l Oil0,046 mg/l ParameterAverageRange Cond.35 mS/m21-44 pH7,67,3-7,7 SS15 mg/l10-27 Coliform68000 /100ml BOD 7 5 mg/l1,2-8,6 P tot 63 µg/l54-82 N tot Oil< 0.04 mg/l ParameterAverageRange Cond. 46 mS/m42-56 pH 8,37,8-9,8 SS 10,4 mg/l5,2-21 Coliform 970 /100 ml /100 ml BOD 7 1,8 mg/l1,2-2,3 P tot 82 µg/l N tot 2320 mg/l Oil 0,11 mg/l ParameterAverageRange Cd< 0,1 µg/l Cr3,3 µg/l1,3-3,6 Cu0,01 mg/l0,008-0,014 Pb< 1 Quality of stormwater in Turku