Ministry of Economic Affairs
Case: Water and Nature
Lake Grevelingen
Hayo Haanstra
Department Nature Biodiversity
The Netherlands
The Netherlands: South West Delta
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
Lake Grevelingen
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
Situation
• Delta works, enclosure lake Grevelingen
• Cessation of tides
• Largest salt water lake in Europe
• Pressure on typical estuarine species
• New values developed and expanded
• Still in transition from dynamic to low dynamic
• Unstable and unsustainable system
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
Problem
Water:
• Water quality deterioration
• Anoxicity bottom water layer
• Organic sludge
Nature:
• Values to be protected
• Long term conservation difficult
• Intensive management
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
System change reintroduction of tides
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
Change and Effects
Change:
• Robust and sustainable delta system
• Restore original natural values
• Reintroducing tides
• Water quality
Effects Habitat/ bird directive:
• Positive on fish, birds and
• New species like sandwich tern and grey seal
• Negative for humid dune valleys and fen orchid
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
Objectives WFD and Nature
• WFD, natural based system
• Natura 2000
- New species
- Species to disappear:
dune valleys
Fen orchid
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014
New designation
• Process
Change of objectives
Fore casting
Favourite reference values
Bio geographical region
Risks?
Workshop nature, biodiversity, marine and water policies
Brussels, 2 and 3 December 2014