wetland buffer zone implementation in sweden - … strand - wetland buffer zone...wetland buffer...
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Wetland buffer zone implementation in Sweden
- experiences from LIFE-Goodstream
John Strand, Peter Feuerbach & Lisa Feuerbach-Wengel
Hushållningssällskapet Halland
www.goodstream.se
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CWs: large hydrological loads
Buffer zones: only
surface run-off
The reality: many sites with smaller
drainage systems enter the recipients
directly, i.e. passing under traditional buffer
zones (if any present).
The problem
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By combining:
Ecosystem services of
constructed wetlands
…we get:
http://www.skogforsk.se/KunskapDirekt
Riparian buffer zones
in forests
Christen and Dalgaard, 2012
Sites of traditional
buffer zones
Tree root penetration depths
(infiltration enhancement)
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The infiltration bank without topsoil is ca. 5 m wide. Can
be planted with trees, resulting in better infiltration
1 m level control in
outlet well
Excavated soil placed on the field
Maintainance pipe
Field
Sediment excavated + recycled to field
Integrated Buffer Zones (1st pilot constructed march 2012)
Pilot IBZ, Lilla Böslid, Sweden
Trees (Birch), planted saplings
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Integrated Buffer Zones 1st pilot at Lilla Böslid, Sweden,
80 m long, testing trees and Reed
canary grass on infiltration bank Low water level August 2012
Incoming pipes.
Test with Reed
canary grass
(bioenergy)
Trees (Birch), planted saplings
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Low water level September 2015
Alder (Alnus)
Reed canary
grass (and
some Alder)
High biodiversity Amphibians: 4 species
Mammals: 6 species
Birds: 10 species
Invertebrates: >30 species
Aquatic plants : 13 species
Terrestrial plants: >15 species
High N and P retention
P = 70-90 % retention
N = 35 – 80 % retention
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Integrated Buffer Zones in Europe
(September 2018)
15 in Sweden
(11 in LIFE-Goodstream)
5 in Denmark
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LIFE-Goodstream Reaching Good Ecological Status in an agricultural stream
- introducing Integrated Buffer Zones in a hollistic approach
Good tream
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Problems
Eutrophication Fish migration
Floods
Biodiversity
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• Good Ecological Status in river Trönningeån
- P-conc. in the stream reduced to < 50 µg/l
- Migration possible in the whole stream
- 10 % increase in Salmonid density
- Reduced flood risk in the village of Trönninge
- Increased biodiversity in the catchment
• Calculations showing economic cost-effectiveness
• Quantified carbon sequestration in IBZs and LWs
Long-term goal:
the concept is implemented throughout EU
Expected results
www.goodstream.se
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• 6 years (Oct 2015- Oct 2021)
• Budget ca 20 MSEK (> 2 M. €)
• Financing: - 49% EU
- 45.7 % Swedish Agency for Marine and Water Management
- 5.3 % own financing by partners
• Coordinating Beneficiary: Hushållningssällskapet Halland
• Associated Beneficiaries: County Administration
Halmstad municipality
LIFE-Goodstream
Good tream
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Good tream
• Drainage area: 33 km2
• Lenght from source to mouth: ca 11 km
• 50% agricultural, 42% forest, 8% urban
map from SMHI:s Vattenweb
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• 30 Integrated Buffer Zones
• 8 Wetlands
• 60 Creotopes
• 500 nest boxes
• 1 Removal of migration barrier
• 1 Urban Storm Water Pond
Our tools
wetland
Creotope (amphibian pond)
Nest box
Integrated buffer Zone
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Good tream
First 3 years (2016/18):
11 Integrated Buffer Zones
13 wetlands
18 amphibian ponds
8 other creotopes
2 migration barriers removed
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Problem: how to remove a wetland migration barrier and still increase nutrient retention and biodiversity
Solution: use a variety of multi-functional wetland buffer zones (IBZ, wetlands etc)
Before After
Wetland buffer zones in LIFE-Goodstream
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Total P 2016-03-21 – 2017-02-20 (main channel)
Barrier removal
Barrier removal Barrier removal
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Aerial view after barrier removal
and wetland buffer zone constructions
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Implementation of wetland buffer zones
IBZ IBZ
IBZ IBZ
IBZ
CV
CV
CV
CV
IBZ = Integrated Buffer Zone
CV = Constructed Wetland
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Brook lamprey (Lampetra planeri) in
the new (old) streambed first year
Wetland birds in the new CWs
Surveys show increased biodiversity
Increase in aquatic plants Tadpoles and
newts in
amphibian ponds
Increase in insects
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Multi-functionality!
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Come visit us in Sweden or read more at: www.goodstream.se
www.wetlands.se
www.goodstream.se
Thank you!