River Skjern: Presentation of speaker 1

1. Mogens Bjørn Nielsen Geomorphologist Hydrologist Head of Rivers, Landscape and Planning Department in the Region of Aarhus www.aaa.dk MBN@ag.aaa.dk Experience includes: River Skjern: project steering and projecting River Brede: Project leader The EU-Life River Restoration Project with UK: Project leader In 15 years responsible for the sea dike to the Wadden Sea and river dikes in the Region of South Jutland River Skjern: Presentation of speaker 1

2. River Skjern, Denmark • Background: River Brede – example on benefits for biodiversity • Aims and considerations in the River Skjern Nature Project • The challenge in projecting to secure flood defence with nature benefits • The results in the field • The democratical process

4. R. Brede: Before EFC = regulated

5. R.Brede Restored In the back and still regulated in the front

6. R.Brede The meadows as water reservoir at high discharges

7. 94 95 96 99 94 95 96 99 94 95 96 99 EFFECT ON FLORA - EXAMPLE RIVERBANKS PLANTS Number of species other species 192 200 Wetland-species 176 157 155 153 148 150 133 127 117 116 112 104 100 50 0 North riverbank South riverbank Both riverbanks Number of species of riverbank plants on the two riverbanks of River Brede before and after restoring.The river was on this reach restored in late 1994 between the investigations in summer 94 and summer 95.

8. 94 95 96 99 94 95 96 99 94 95 96 99 EFFECT ON FLORA -EXAMPLE MEADOW PLANTS Number of species 97 other species 100 Wetland-species 82 81 75 80 71 69 68 63 56 60 49 49 48 40 20 0 Area 1 Area 2 Area 3 Number of species on 3 areas along River Brede before and after restoring. The river was on this reach restored in late 1994 between the investigations in summer 94 and summer 95.

9. Geography • North Sea region • Coastal humid climate • Lowland • Intensive farming

10. Skjern River • Catchment: 2500 km2 • Discharge: 35-100 m3/sec • 5000 t N/year • 100 t P/year • 30,000 t sediments/year • The lower part regulated and diked in 1962-68 • The “inland delta” drained for intensive farming

11. River Basin and Project Area

12. Regulation scheme

13. Objectives • Restore meandering and natural dynamics and secure against flooding outside project area • Improve conditions for flora and fauna • Ensure high water quality in the river system and the Fjord • Improve the basis for outdoor leisure

14. Regulation and drainage 1800: Inland delta: 4000 ha of wetlands, unique in Denmark 1900: Small scale regulation starts 1962-68: Main regulation and drainage scheme 1970-86: Increasing environmental concern Restoration 1987: Parliament decision: The river to be restored for self-purification 1988: Grants for land acquisiton 1995: Detailed surveys and design started 1998: Public works act 1999: Earth works started 2002: Restoration complete From regulation to restoration

15. Nature lost A unique riparian system Part of a major migration corridor Poor conditions for Salmon and Whitefish Biotopes of rare species disapered Pollution Ochre Nutrient leakage No retention Farmer’s concern Land shrinkage Environmental Concerns

16. Land shrinkage large areas now lower than the river and even below sea level either let the river flow through shallow lakes and restore the inland delta by time or restore it separated from lakes and wetlands by levés Decreasing earth works Landscape priorities Using existing dikes for delimitation where possible Using existing bridges Protection of sensitive flora and fauna Utilisation of old meanders Authenticity Design Considerations

17. Construction and earth works • 2 new bridges • Road to be elevated • 5 bridges decommissioned • 2 pumping stations decommissioned • Dikes to be removed • Re-meandering • Total earth works: 3 million m3

19. Before: Highway for water bordered by dikes

20. Before: Secondary drainage channel

21. R. Skjern ready to bend again

22. Before

24. Nature areas and intensive farmland side by side

25. The tributary R. Omme also restored

28. Discharge

31. Total earth works: 3 million m3

40. Democratical process Know how on restoration -  the art of restoration and aesthetic -  authenticity/originality -   the physical dimension -   the biological dimension the hydrological dimension

41. Democratical process Political dimension -  protect environment and nature - quality objectives for streams, lakes and coastal waters -   NGO’s and interest groups -   Investments -   Public interests Regional plans and goals Know how on restoration -  the art of restoration and aesthetic -  authenticity/originality -   the physical dimension -   the biological dimension the hydrological dimension

42. Democratical process Landowners Political dimension -  protect environment and nature - quality objectives for streams, lakes and coastal waters -   NGO’s and interest groups -   Investments -   Public interests Regional plans and goals -        private landownership -         involvement -         negotiations -         compensations exchange of land Know how on restoration -  the art of restoration and aesthetic -  authenticity/originality -   the physical dimension -   the biological dimension the hydrological dimension

43. Democratical process Landowners Political dimension -  protect environment and nature - quality objectives for streams, lakes and coastal waters -   NGO’s and interest groups -   Investments -   Public interests Regional plans and goals -        private landownership -         involvement -         negotiations -         compensations exchange of land Practical dimension Know how on restoration -  project management and leadership -   tenders contractors Goals Success criteria Methods Cooperation Time & budget Quality assessment -  the art of restoration and aesthetic -  authenticity/originality -   the physical dimension -   the biological dimension the hydrological dimension

44. Recommendations on lowland stream restoration Include consideration on the catchment area and the whole stream valley in the project plan Secure the hydrological connection between the stream and its valley. Establish many crossings between the straight, regulated course and the new meandering, restored course, in order to secure rapid colonisation by aquatic plants and other organism Restoration projects involving excavation of the former floodplain must take into consideration existing vegetation niches worthy of preservation. Restoration of streams by means of large-scale excavation should start during periods of low discharge (in Denmark this period is July to September). The construction work should be finished before the spawning season for trout and salmon occurs late in autumn.

45. How to gain the most ’nature’ for the invested money in restoring streams and wetlands • Stable investments and long-lasting projects • Low costs to buy areas and laying out the project • Low cost to maintenance after completion • Large areas better than spots • Several purposes at the same time • Political and local back-up • Cooperation between authorities and ‘interest groups’

46. A way to better ecosystem in streams and wetlands • Prevention is better and cheaper than treatment • Stop the accident • Preserve what still is in a natural condition • Stop drainage and further regulation • Proper maintenance and recreational use • Use market economics: Socio-economic effects plus links to agricultural land-use and subsidies • Rehabilitation and restoring when 1 to 6 have been considered and used • International cooperation is necessary