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Reinforcement of the
Delfland coast
Edith van Dam
Directorate-General of Public Works and
Water Management
Projectmanager: Rob Ammerlaan (Delfland Waterboard)
Pieter Beeldman, Arie van Blanken, Edith van Dam, Ytje Feddes,Jasper
Filselier, Jerry Haket, Joost ter Hoeven, Roland Hoyinck, Arjan van de
Lindeloof, Jeroen Rietdijk, Marjolein Rours, Lisette Veeken, Jack Vessies
Contents
•
•
•
•
•
Public sector in a nutshell
9 weak links in the coast
Delfland coast
Anticipation of climate change
Support base
Public sector structure
Central
Government
General
democracy
12 Provincial
authorities
458 Municipal
authorities
27 Waterboards
Functional democracy
Competences in coastal
management:
• National administration: lawmaking, safety
standards
• Ministry of Transport, Public Works and Water
Management: coastline preservation, beach
nourishments
• Waterboards: flooddefence
• Municipalities: spatial planning
• Provinces: regional planning, supervision of
waterboards and municipalities, approval of
reinforcement plans
Weak links in
the coast
• Between now and
20 years a safety
problem
• Economical and
ecological
importance
requires a for an
integrated
approach
Delfland coast
Water safety
Water safety is established by law:
• Protection levels
• Five-yearly assesment
Protection level South-Holland:
resist a storm surge occuring once in
10.000 years on average
The Netherlands without
dykes
Organization of the plan
development process
National government commissioned provinces to
develop plans for coastal reinforcement and
improvement of the quality of the environment
Delfland coast:
• Delfland waterboard (projectmanager)
• Province Zuid-Holland (directing function)
• Municipalities (The Hague, Westland,
Rotterdam),
• National authority (funding safety solutions)
Characteristics of the
Delfland coast
Scheveningen
Kijkduin
Ter Heijde
Hoek van Holland
Hoek van Holland
Characteristics of the
Delfland coast
Ter Heijde
Characteristics of the
Delfland coast
Kijkduin
Characteristics of the
Delfland coast
Scheveningen
35 ha dunes
Mainport Development Rotterdam:
construction of a new harbour area
Maasvlakte II
Compensation is needed for effects on existing
dunes (among other effects)
Alternatives investigated
• Landward reinforcement of the sea
defence
• Reinforcement at the same location
– Heightened dunes
• Seaward reinforcement
– Seaward
– More seaward
Preferred alternative:
seaward
Southern part
Hoek van Holland
Ter Heijde
Northern part
Kijkduin
Scheveningen
Anticipation of climate
change
• Designed for 50 years (sea level rise)
anticipation of 200 years
• Solutions with sand are flexible
Anticipation of climate
change (2)
Straight coastline & broad beach:
Dunes can grow in a natural way by coastal
nourishment and cope with future safety standards
Support base
• Different government levels working
together
• Understanding of stakeholders is crucial
• Seaward: (almost) no resistance
• Tailor made solution for Kijkduin