1. ADAPT Project: Assessment of the costs of the adaptation measures Economic aspects Fourth Follow Up Committee Meeting Uccle, 12 November 2008 Delphine Sacré CEESE-ULB Eve Giron CEESE-ULB Walter Hecq CEESE-ULB

2. Technical and non-technical adaptation measures  Technical measures : Renaturalisation of water bodies via the reconnection of riparian wetlands, restoration of rivers’ natural floodplains and degraded wetlands Construction of areas for controlled flooding Construction of dams, dikes and dike heightening, walls (Use of mobile walls), Construction and/or adaptation of weirs Pumping Creation of a diversion canal (surface/underground) to the watercourse Cleaning of river beds (dredging) Artificial elevation of the surface level (Temporary) reinforcement of buildings Construction of pile or floating dwellings Construction of refuges in flood risk area

3. Technical and non-technical adaptation measures  Non-technical measures : Limiting the use of flood plains (land use planning) Enhancing the retention capacity of soils (stimulating year-round vegetation cover, prevention of soil compaction and sealing via regulations) Conservation and protection of wetlands and floodplains, preserving river via land use planning and the development of specific directives for the water managers Risk mapping and related communication measures and planning initiatives Research and knowledge dissemination Flood forecasting and early warning systems Establishment of an emergency response plan Establishment of a public compensation system for supporting victims Assistance in repairing damage and cleaning up the dirt

4. Costs of the adaptation measures Main cost components : Investment costs, Operating costs, Maintenance costs, Costs of property tax, … :present costs (in €) for programme X i :the year of investment j :measures (n is the number of measures considered in the programme X : investment costs for meausres j in year i r : discount rate :period after wich maintenance is needed for the first time for the measure j :lifetime of measure j :maintenance and repair costs for measure j in year k, for the investments made in year i

5. Net present value 3 key concepts: 1. Average annual damages : 2. Average annual avoided damages : DMA( without project) – DMA (with project) 3. Net present value : B i = average annual avoided damages C 0 = initial cost of the project B i = benefits of the project (waited at the time period i) C i = operating costs n = life time of the project r i = discount rate (depending on the period i) D(T) = costs of the inondation of a return period T, Td = weakest return period considered