Reinforcement of theDelfland coast

Edith van DamDirectorate-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

12 Provincial authorities

458 Municipal authorities

27 Waterboards

Functional democracy

General 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 inthe 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 processNational 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

Northern part

Ter Heijde

Kijkduin

Hoek van Holland

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