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Preventing flood risk

Because of climate change, urban concentration and specific geographical or climatic characteristics, flood events are becoming more frequent and devastating for people and for the environment.

Projections by the United Nations Development Programme show some 2.5 billion of people will be vulnerable to floods in 2050…

It is essential to identify and assess the flood risk to be able to implement the structural measures (defence works against floods, warning systems and flood forecasting) or regulations (prevention plans and risk management) that will limit its effects.

For many years, Egis has been developing skills and resources that meet the technical and institutional requirements of flood protection

This technical expertise relies upon and benefits from local knowledge, to obtain a diagnosis shared by as many parties as possible, including not just policy makers and financial backers, but also the people themselves and economic stakeholders.

A sound protection strategy needs to integrate a wide range of requirements: economic, land development, social priorities and environmental protection.

It is precisely this comprehensive approach that Egis favours in its studies and action plans:

  • Blueprints for waterway development,
  • Hydrological and hydraulic modelling,
  • Mapping of flood zones,
  • Flood protection development,
  • Stormwater drainage infrastructure,
  • Cost-benefit analyses,
  • Rising water level warning systems,
  • Measures to reduce vulnerability,
  • Contingency plans and crisis management.

Project to rehabilitate the network for collecting and draining rainwater in Port Gentil, Gabon. A project to reduce flood risk and improve safety for residents

Port-Gentil is a coastal city in the north-west of Gabon. It is also the economic capital of the country which produces
about three-quarters of its wealth with an oil industry and wood industry.
The problem of stormwater drainage in Port Gentil is due to a flat landscape, proximity of the sea and the water-table
very close to the surface. The existing infrastructure is largely inadequate and in very poor condition.. In consequence,
when it rains, the city regularly experiences floods that put its population and services at risk.
Aware of of the importance of what is at stake, the Agence Française de Développement (AFD) and the Gabonese
government have put in place funding to rehabilitate the existing collection network and drain the city’s rainwater.

Flood risk/some key Egis Group references:

  • In France: protection against rising water levels in the Isère area: Read the Egis Contact article “Halte aux crues de l’Isère” – (hydraulic, environmental and landscaping works, €87 million) (Engineering, Procurement and Construction Management)
  • Anti-flood hydraulic development in the Bassée sector, upstream of the Seine-Yonne confluence, Egis, in consortium with Ashurst, has ensured the continued operation of the project – to find out more
  • Montpellier, France: Construction of anti-flood dykes on the river Lez (Engineering, Procurement and Construction Management)
  • Nice, France: Development scheme for the Grand Arénas neighbourhood on the edge of the river Var. Blueprint for hydraulic consistency (general studies)
  • Lambersart, France: Guy Lefort rainwater storage basin (buried under the stadium’s sports infrastructure, 28,000 m3, depth of 20 m and 45 m in diameter). Engineering, Procurement and Construction Management.
  • Gujarat State in India: Combating floods in the state of Gujarat. Advice and general studies for establishing a comprehensive flood warning system.
  • The Maritza and Tundja rivers in Bulgaria and Turkey – Disaster prevention related to rising water levels in the border region between Bulgaria and Turkey. Technical assistance for the development of a forecasting model and a flood warning system.