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(D)rain for Life project conference, Prnu 29.11.2013 SUDS in existing urban context: case case stu study dy Vr Vru, , Estonia Jekaterina Balicka, Gen Mandre, Ottar Tamm Estonian University of Life Sciences Location in the context of


  1. (D)rain for Life project conference, Pärnu 29.11.2013 SUDS in existing urban context: case case stu study dy Võr Võru, , Estonia Jekaterina Balicka, Gen Mandre, Ottar Tamm Estonian University of Life Sciences

  2. Location in the context of Estonia

  3. Main characteristics of Võru Võru locates in valley Hargla between Otepää Upland and Upland Haanja • City passes St.Petersburg-Pskov-Riga-Tallinn rail and Luhamaa road • There are three lakes at the city territory - Tamula (229 ha), Kubija (15,9 ha) ja • Kubija Veskijärv (1,7 ha) Population + 13 482 people living in Võru and 36 403 people in the county (2012) • Town of 14 km ² •

  4. Location of case study area

  5. Land ownership Private ¡land ¡ Municipal ¡land ¡ Public ¡land ¡ Unreformed ¡public ¡land ¡

  6. Terrain

  7. Tartu street Problem with stormwater and melting water caused streets and beach errosion In case of extreme rain event rainwater causes the flooding of the street and enters the lake unpurified

  8. Vabaduse street In case of extreme rain event rainwater causes the flooding of the street and area between Tartu and Vabaduse streets in the lower part of the area

  9. Vabaduse street Big amount of covered surface resulting the flooding of remaining area

  10. Challenges Varying groundwater level • Low infiltration capacity due to the high number of surfaced area • Polluted runoff (salt, traffic pollution) enters the lake unfiltered • Erosion • Needs Runoff delay to increase evaporation and infiltration • Runoff water purification • Instruments to stop erosion • Instruments to stop flooding •

  11. 1. Raingardens

  12. 1. Raingardens

  13. 1. Raingardens

  14. 2. Open vegetated drains

  15. 3. Dry infiltration basin and system of ditches

  16. 4. Cobblestone stripe

  17. Runoff calculations Calculated discharge To ¡Tartu ¡street ¡ ¡ Q ¡= ¡436 ¡l/s ¡ ¡ To ¡Vabaduse ¡street ¡ Q ¡=136 ¡l/s ¡ ¡ Reten@on ¡pond ¡ ¡ ¡ ¡ Q=249+Vabaduse ¡street ¡ ¡Q ¡ =385 ¡l/s ¡

  18. USED ¡STANDARDS/NORMS ¡ • EVS 848:2003 Municipal sewer system • EVS 847:2003 Municipal water supply Q = q × k Ψ × A , where k ¡Ψ ¡– ¡runoff ¡coefficient, ¡depends ¡on ¡surface; ¡ • A-­‑ ¡watershed ¡area ¡(ha); ¡ • q ¡– ¡calculated ¡rain ¡intensity ¡l/s ¡(ha). ¡ • ¡ USED ¡PARAMETERS ¡ • t – rain endurance 20 min/60 min Stormwater recurrence p = 5 years •

  19. www.drainforlife.eu ¡

  20. (D)rain for Life project conference, Pärnu 29.11.2013 Project team of Estonian University of Life Sciences: Valdo Kuusemets, project leader valdo.kuusemets@emu.ee Gen Mandre, project manager gen.mandre@emu.ee Jekaterina Balicka, landscape architect jekaterina.balicka@emu.ee Ottar Tamm , researcher ottar.tamm@emu.ee Lauri Lokko, researcher lauri.lokko@emu.ee

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