1. Hondsbossche Dunes

2. Battling the sea since 12th century
1388; first small sand dyke
4th village built

3. Assessment 2004; failed
Stability
Gras revetment
Overtopping

4. Directive Safety+ spatial quality 50 year Cooperation of
Hoogheemraadschap,
Province Noord-Holland,
Rijkswaterstaat

5. Three alternatives

6. Stakeholders, inhabitants

7. Preferred option… Sand!
Safe
Opportunities for nature, recreation, tourism
Adaptable to climate change
Support from stakeholders
Impact on environment negligible (landscape)
Building within 1 year

8. Signing collaboration agreements
PNH, RWS en HHNK
Spatial quality
Signing collaboration agreements
Nature

9. In figures Het ontwerp Max budget € 250 mil, incl 20 years maintenance
8 km beach
6 km dunes
m³ sand
Max budget € 250 mil, incl 20 years maintenance
Contract: Design, construct, maintenance (20 year)
Het ontwerp

10. Nature mitigation measures
Elastocoast on groynes
Flood (high tide) water refuge for birds
Higher rubble stone zone on Texel

11. In strong collaboration with contractor
Knowledge and experience
Creative solutions and innovative techniques
Contractors communicate directly to stakeholders
Winner on both price and quality:
Technology, nature, recreation and inconvenience
Contract; construction and 20 years of maintenance

12. Werkvolgorde en planning
Building period
Werkvolgorde en planning
: First under water nourishment
: Minister Schulz declared the coast safe

13. Start on 3 march 2014
Vooroeversuppletie met 3 sleephopperzuigers

18. Tourist attraction

19. Lessons Learned
Joint cost benefits standards (with nature reservation organisation)
Describe consequences for management and maintenance for both nature and sand
Prior agreements about exchange of data
Prior evaluation of value for landscape by independent experts

20. Research Reduce uncertainties under- water design (Phd)
Wind-sand transport (MSc)
Under water sand losses (MSc)
Nature 2000 predictability and optimisation of design (Ecoshape)
Optimal slope/height/width of dunes
Vegetation
Ground water levels
Collecting data for next steps (HHNK)
Ground water
Height/depth measurements
Storm chasers team?
Publish raw data for research and design community

21. RWS & la Mer (2014-2017) HHNK (2013-2020/2035)
Excavation permit (ecologie)
NB-permit (ecology, hydrology)
Van Oord & Boskalis ( )
Maintenance (morphology, ecology, hydrology)
HHNK– universities
Sand drift, dune development, management measures (morphology)
EcoShape ( )
Nature based solutions (morphology, ecology, hydrology)