Towards a risk based spatial planning policy for flood prone areas in the ‘A Multi-layer approach for flood risk management in Rijswijk Zuid’

Main challenges of a multilayer approach for floodriskmanagement 1. Broadening the scope of solutions on preventing damage from flooding. 2. Sharing responsibilities between (government) actors. 3. Minimize societal costs.

Layer 1 Minimize the chance on flooding current situation Through strong dykes - enforcement of the dykes - low lying polder

Organisation Main Role and responsibility

Government Safety standards primary- and (national/regional) secondary defence systems Water Board Operation and maintenance of water defence systems

Layer 2 enforced dyke Minimize the impacts of flooding Through spatial planning and flood proof building

Outside Project area Drainage Height of the dyke 0,00 m MSL

Water level outside canal - 0.43 m MSL Water level inside the Present land polder/project area surface at – 1,19 m MSL - 0,70 m MSL

possible situation in the near future - no enforcement of the dykes - raised land surface in the polder Organisation Main Role and responsibility

National National policy on spatial planning and Government water management Regional Integrated spatial planning at regional Government scale (Structuur visie), policy on flood (Provinces) risk zoning Water Board Integrated water management Municipality Spatial planning (Bestemmingsplan: including map and juridical direction of land use) Land developers Sustainable development plan (economical, social and ecological)

Layer 3 Minimize the number of casualties form flooding Through evacuation plans and awareness raising

raised area

Outside Project area Drainage Canal Height of the dyke 0,00 m MSL

Water level Raised new outside canal land surface Organisation Main Role and responsibility - 0.43 m MSL Water level inside the Present land National National standards for safety and polder/project area surface at Governmen t evacuation plans, overall coordination – 1,19 m MSL - 0,70 m MSL large scale disasters Safety regio ns Coordination of regional safety and evacuation (p olice, fire brigade, ambulances) Authors: Water Board Water management, dyke breaches, pumping etc Municipalities Awareness raising, local safety policy Dick van den Bergh Deltares and plans, coordination of evacuation Insurance Flood risk insurance Gerald Jan Ellen Deltares

Residents Take own responsibility Pieter Jan Hofman Province Piet Houtenbos Municipality Rijswijk Zuid Saskia Jouwersma Water Board Delfland

Waterkader