Magdalena Hanna Gajewska

The development of cities and replacement of permeable areas – e.g. green areas – with impermeable ones adds to the disturbance of the natural water circulation. It reduces water infiltration and evapotranspiration while the surface runoff increases significantly. Also the climate changes that we experience with greater and greater intensity have contributed in recent years to more frequent flooding and floods in urbanised areas – the so-called flash floods – sudden local floods occurring most often after dry weather periods (urban droughts).