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Adaptation option

Adaptation of flood management plans (2019)

According to the European Environment Agency, the consequences of pluvial, fluvial and coastal floods in Europe will overall worsen as a result of increases in intensity and frequency of flooding events due to climate change (EEA, 2016, 2020) By 2050 in a business-as-usual scenario, there could be a nearly fivefold increase in the annual economic losses resulting from floods in Europe (SWD(2019) 439).

Floods can be caused by: (i) heavy rainfall or meltwater, when the infiltration capacity of the soil is exceeded; (ii) rivers, when discharges overpass the capacity of water courses and water exits from usual riverbeds, spreading across the land, (iii) or storm-surges responsible for coastal flooding. Climate change is expected to increase the frequency and magnitude of extreme precipitation events, increase average and extreme temperatures (which are important for ice and snowmelt), rise sea level and intensify storminess with negative effects on extreme sea levels, thus further worsening the flooding risk. On the other hand, land use change and anthropological pressure on rivers are consistently impacting on the natural retention and drainage capacity of their catchment areas. This could be translated in a substantial increase of surface runoff and, consequently, in river peak discharge, which is expected to increase in various parts of north-western Europe (Blöschl et al., 2019). In low-lying coastal areas, the co-occurrence of high sea level and precipitation resulting in large runoff may cause compound flooding (Bevaqua et al., 2019).

In the last years flood management has shifted from pure protection against floods to the integrated management of flood risks. In Europe, this shift is reflected in the EU Floods Directive, to be implemented in coordination with the EU Water Framework Directive (WFD). The Floods Directive requires Members States to develop Flood Risk Management Plans (FRMPs) coherently with the WFD river basin management plans. In this process, countries are called to evaluate flood risk on a river catchment scale, compile maps of flood prone areas, and inform local communities about these risks. Flood risk maps have to cover the geographical areas, which could be flooded in case of events with low (extreme event scenario), medium (e.g. those with a return period ≥ 100 years) and high probability. For each of these events the assessment should provide insights about the spatial extent of the flood, the water level and the velocity of the water flow. Flood risk maps are also very useful to communicate the exposure and vulnerability of flood prone areas to stakeholders.

FRMPs are expected to address all relevant aspects of risk management, focusing on prevention, protection, preparedness and medium and long term planning, considering the characteristics of the particular river basin or sub-basin they deal with. A combination of green and grey measures can be considered by flood risk management plans to mitigate flood related issues at the river basin scale. Traditional flood (grey) protection solutions include dams, dikes, channels, storm surge defences and barriers in general. FRMPs may also include the promotion of green measures, including: sustainable land use practices, managed retreat from flood-prone areas, improvement of water retention through preservation and requalification of floodplains and wetlands, as well as controlled flooding of certain areas in the case of a flood event. Important solutions that can reduce the exposure of people and assets to floods also include awareness raising, early warning and the use of insurance schemes.

Additional Details
Reference information

Adaptation Details

Category

Soft

IPCC categories

Institutional: Government policies and programmes, Institutional: Law and regulations

Stakeholder participation

The implementation of the EU Floods Directive requires the establishment of public participation mechanisms to ensure citizens’ involvement in the flood management cycle. All assessments, maps and plans prepared according to the Floods and WFD directives have to be made available to the public and uploaded to the common digital repository WISE, managed by the European Environment Agency.

FRMPs call for the input from different levels of institutions (national and regional) and from a large set of competencies. A variety of consultation channels with the public and stakeholders was used and, overall, a broad range of stakeholders was involved in the preparation of the first FRMPs (due by 2015). Among relevant stakeholders, the involvement of private subjects is also very important, as very often private properties are affected, directly or indirectly, by the implementation of the measures foreseen by the FRMPs.

Success and Limiting Factors

In some cases, the implementation of the Foods Directive has been beneficial in improving and strengthening the lack of coordination and collaboration among different sectors (e.g. flood protection, emergency planning, civil protection, spatial planning, insurance, river restoration), decision makers and stakeholders operating at different spatial scales. Despite such important effort, lack of coordination among different subjects and specifically between FRMPs and national adaptation strategies or plans is still an important gap in the shared management of the flooding risk.

As a result of the flood mapping process, the vulnerability of a wide number of European watercourses and coastal areas was mapped and assessed thus providing very useful knowledge for managing flood-prone areas. However, in the first cycle of FRMPs pluvial flood risk (due to heavy rainfall exceeding the soil infiltration capacity) was not considered equally relevant and its assessment was less detailed if compared to riverine and coastal risk evaluation.

Data availability and human and financial resources required to implement the flood mapping and assessment process, also considering climate change projections, are among the main constraints when dealing with FRMPs.

The Floods Directive adopts the river-basin scale as the unit of management and takes a multilevel approach to goal and standard setting, which is a positive attribute for adaptive governance, specifically in the light of climate changes. However, the lack of proper instruments formally embedded into the legal system that support cooperation mechanism might limit transboundary cooperation. In addition, differences in the legal frameworks, political viewpoints on flood risk management, and economic, social, and physical settings may hamper proper coordination and cooperation between scales.

Costs and Benefits

The preparation of a Flood Risk Management Plan normally follows a 6-year cycle of planning, which requires the involvement of a wide variety of experts, including land and coastal planners, hydrologists, modellers, environmental scientists, engineers, etc. Resource and time efforts to be devoted to the plan elaboration depends on the scale of analysis, the strategic objectives and targets of plan and the availability of data and tools for their analysis. Given its importance, specific resources must be dedicated to stakeholder engagement and consultation, as well.

The EU Flood Directive requires Member States to assess if areas close to watercourses and coastlines are at risk from flooding, to map the flood extent, assets and humans at risk in these areas, and to take adequate and coordinated measures to reduce this flood risk. The Directive also requires Member States to take in consideration the effects of climate change on the magnitude, frequency and location of floods, and therefore to integrate such effects into flood risk assessment, protection, prevention and preparedness.

Besides in the FRMPs themselves, the impacts of climate change and long term developments on the occurrence of floods is part 2 preceding steps of the planning process and of the reporting requirements: both the Preliminary Flood Risk Assessment and the Flood Hazard and Risk Maps should make clear how climate change is included (or not) in the mapped scenarios.

The Flood Directive shall be carried out in coordination with the Water Framework Directive, notably by flood risk management plans and river basin management plans being coordinated, and through coordination of the public participation procedures in the preparation of these plans. Both directives reinforce the rights of the public to access this information and to have a say in the planning process. A separate guidance document “River Basin Management in a changing climate” was produced to support this coordination.

Implementation Time

The preparation of a flood risk management plan is based on three major steps each lasting 2 years: (i) preliminary flood risk assessment (PFRA); (ii) flood hazard and flood risk mapping, (iii) elaboration of the Flood Risk Management Plans (FRMP). The implementation time of the plan is highly dependent on the set objectives and targets and the related identified measures.

Life Time

Flood risk management plans have to be reviewed every 6 years according to the Floods Directive. As far as implementation is concerned, lifetime of specific measures included in the plans depend on the measure typology, varying from months to decades.

Reference information

Websites:
References:
SWD (2019) 31. Commission report on the implementation of the Water Framework Directive (assessment of the second River Basin Management Plans) and the Floods Directive (first Flood Risk Management Plans). SWD (2019) 439. Fitness check of the Water Framework Directive and the Floods Directive. ECA, (2018). Floods Directive: progress in assessing risks, while planning and implementation need to improve. EEA (2016). Flood risks and environmental vulnerability. Exploring the synergies between floodplain restoration, water policies and thematic policies. EEA Report 1/2016.

Published in CA:

23-05-2016

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