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Kiimaneva wetland creation, Siikainen


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Kiimaneva wetland creation

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Kiimaneva wetland creation, Siikainen

  1. 1. LIFE+ Return of Rural Wetlands Finland, Siikainen, Kiimaneva wetland creation
  2. 2. Wetland area before restoration 08.05.2013 Photo: Timo Niemelä
  3. 3. The aims and premises of Kiimaneva wetland creation The aims of the wetland creation: To develop model wetland ofgame habitat management and waterfowl habitat To increase wildlife resources To increase biodiversityand enhance landscape To improve water protection The premises of wetlandcreation: The wetland will be constructed on private owned land The wetland will be constructed to arable field The catchment area is onlyabout 20 hectares It is possible to create the wetland bydamming The embankments must be constructed carefully
  4. 4. Embankment construction 8.-13.8.2013 • The base (footprint)ofthe embankment was cleared of any organicmatter or big rocks prior to construction Photo: Timo Niemelä
  5. 5. Embankment construction… • En excavator with fitted a stump removal head is useful in removingstumps from the base of the embankment Photo: Timo Niemelä
  6. 6. Embankment construction… • All organic material were removed to assure to forma tight seal with the soil already there at the base of the embankment Photo: Timo Niemelä
  7. 7. Embankment construction… • All big rocks and other soil not suitable for construction were removed and relocatedbehind the embankment near side slope Photo: Timo Niemelä
  8. 8. • The core of the embankment was constructed with water-proof turf and clay Photo: Timo Niemelä Embankment construction…
  9. 9. Embankment construction… • The embankmentwith 1:2 side slopes is enough when no grass–cuttingor other machines are used for side slopes maintanance. • Soil was borrowed onlya little next to embankmentto preventsloughning Photo: Timo Niemelä
  10. 10. Installing water control structure • Full-round flashboard riser made fromHDPE (high-density polyethylene) pipe was installed to control water levels and dewater the wetland • Valves and other maintenance items are locatedinside the riser • Beavers or muskrats are not present here, so they don´t cause any problems Photo: Timo Niemelä
  11. 11. Installing water control structure… • Riser provides a stable,long-lasting,affordable structure and is visiblyunobtrusive • Riser manhole can be locked • All joints were done with stainless steel screws Photo: Timo Niemelä The costs of the riser - Riser Spiro SN 4, 675/600 mm: 850 € incl. tax - Pipes and other supplies: 450 € incl. tax
  12. 12. • Turf and clay was used as a lining layer of the slide slopes of the embankment Photo: Timo Niemelä Embankment construction…
  13. 13. Kuva: Timo Niemelä Embankment construction…
  14. 14. Embankment construction… • En excavator equipped with rototilt is useful for final shaping of side slopes Photo: Timo Niemelä
  15. 15. • The top of embankment was constructed about 70 cm over heighst planned water level • The side slopes were lined with soil to enhance growind of natural vegetation Photo: Timo Niemelä Embankment construction…
  16. 16. • An emergency spillway (HDPE pipe) was installed in the end of embankment • It needs to be installed for alternate water drainage during high floods Photo: Timo Niemelä Construction of the emergency spillway
  17. 17. The embankment is finished • The length of the embankment is 60 meters and the top about 4 meters, construction costs were 3 040 € (49 working hours x 62 €/h, incl. tax. Photo: Timo Niemelä
  18. 18. Summary of the machineworks Excavator: - CAT 315C L + Engcon EC20 -head Contractor: - Tmi Maanrakennus M. Ruuhimäki Photo: Timo Niemelä
  19. 19. Construction of artificial islands and other resting places Kuva: Timo Niemelä Photo: Timo Niemelä • Some artificial islands and other resting places were done for waterfowl • Islands were covered with hummocks to accelerate the development of vegetation and to provide shelter for waterfowl
  20. 20. Islands and resting places… Kuva: Timo Niemelä Photo: Timo Niemelä • Rocks and logs were placed for resting places to waterfowl and other wetland birds
  21. 21. Kiimaneva wetland 29.8.2013 Photo: Timo Niemelä
  22. 22. Photo: Timo Niemelä Kiimaneva wetland 4.11.2013
  23. 23. Kiimaneva wetland 4.7.2015 Photo: Marko Muuttola
  24. 24. Kiimaneva wetland 4.7.2015 Photo: Marko Muuttola