Flood retention basins in the Mediterranean urban areas

Abstract

Although the Mediterannean climate is known to be dry and warm, rainstorms in autumn and winter can produce floods in coastal cities and damage of important economic consequences. Where topography permits, storm-water retention basins may be used to reduce the peak rate of discharge to the sewer system. These basins can be integrated into the urban site and are compatible with environmental requirements. Green areas of sport facilities can be located in these retention basins, which are designed to contain floods of 20- or 50-year return periods. In the text, different methodologies for design of flood retention basins are reviewed. Examples of application are given from the city of Rethymnon, where the risk of flooding is high.