The Flood Impact Assessment from Ilisua Catchment Area on the Environment

Abstract

In the first part of the paper are making a geomorphologic description of the catchment area and the flash floods taken into account. All these events show the vulnerability of the catchment area studied to hydro morphological and geomorphologic hazards, fact that draws attention to their management by a new approach, namely of the flood risk management.Flash floods produced in June 2006 in catchment area Ilisua had a rain genesis, with values between 28 l/m2 in the low area, respectively 53 l/m2 in high areas of basin areas. Low surface of the superior catchment area has determined quick concentration of the water toward the main collectors and formation by flood, phenomenon facilitated and by the fragmentation relatively high of relief, thus ensuring a contribution hydrological important. Floods formatted in superior river basin of Ilisua River, have determined in addition by the erosion effect, entrapment and redistribution of a huge volume of silt. At the end of the paper, by applying the current concepts of the effect reduction in impact with environmental, is proposed the series of structural and non-structural measures for reducing flood intensity.