kiimaneva wetland creation, siikainen

LIFE+ Return of Rural WetlandsFinland, Siikainen, Kiimaneva wetland creation

Wetland area before restoration 08.05.2013

Photo: Timo Niemelä

The aims and premises of Kiimaneva

wetland creation

The aims of the wetland creation:

� To develop model wetland of game habitat management and waterfowl

habitat

� To increase wildlife resources

� To increase biodiversity and enhance landscape

� To improve water protection

The premises of wetland creation:

� The wetland will be constructed on private owned land

� The wetland will be constructed to arable field

� The catchment area is only about 20 hectares

� It is possible to create the wetland by damming

� The embankments must be constructed carefully

Embankment construction 8.-13.8.2013

• The base (footprint) of the embankment was cleared of any organic matter or big

rocks prior to construction


Embankment construction…

• En excavator with fitted a stump removal head is useful in removing stumps from

the base of the embankment


Embankment construction…• All organic material were removed to assure to form a tight seal with the soil already there

at the base of the embankment



• All big rocks and other soil not suitable for construction were removed and relocated behind

the embankment near side slope


• The core of the embankment was constructed with water-proof turf and clay




• The embankment with 1:2 side slopes is enough when no grass–cutting or

other machines are used for side slopes maintanance.

• Soil was borrowed only a little next to embankment to prevent sloughning


Installing water control structure• Full-round flashboard riser made from HDPE (high-density polyethylene) pipe was installed

to control water levels and dewater the wetland

• Valves and other maintenance items are located inside the riser

• Beavers or muskrats are not present here, so they don´t cause any problems


Installing water control structure…

• Riser provides a stable, long-lasting, affordable structure and is visibly unobtrusive

• Riser manhole can be locked

• All joints were done with stainless steel screws


The costs of the riser

- Riser Spiro SN 4, 675/600 mm: 850 € incl. tax

- Pipes and other supplies: 450 € incl. tax

• Turf and clay was used as a lining layer of the slide slopes of the embankment



Kuva: Timo Niemelä


Embankment construction…• En excavator equipped with rototilt is useful for final shaping of side slopes


• 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



• An emergency spillway (HDPE pipe) was installed in the end of embankment

• It needs to be installed for alternate water drainage during high floods


Construction of the emergency spillway

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

Summary of the machineworks

Excavator:

- CAT 315C L + Engcon EC20 -head

Contractor:

- Tmi Maanrakennus M. Ruuhimäki


Construction of artificial islands and other resting places

Kuva: 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

Islands and resting places…

Kuva: Timo Niemelä


• Rocks and logs were placed for resting places to waterfowl and other wetland birds

Kiimaneva wetland 29.8.2013



Photo: Marko Muuttola

kiimaneva wetland creation, siikainen

Environment