A SIMPLE GIS METHOD FOR OBTAINING FLOODED AREAS
ROMAN P., I., OROS C., R.
ABSTRACT. A simple GIS method for obtaining flooded areas. This paper presents a method for obtaining flooded areas near to a riparian locality using Geographic Information Systems applications, without using of expensive flood models. The method is useful for stakeholders and the public to assess the vulnerability of buildings near water courses and shaping bands crossed by rivers flooding in towns using GIS. The proposed method uses high resolution GIS vectors, raster’s and few hydro-hydraulics calculation results. In this paper a simple GIS method for obtaining local flooded areas was developed. Also description of the method is based on a case study in a riparian locality, from Crişul Alb river basin. Along a cross section, based on digital terrain model, it is possible to highlight the extent to which water level will reach a certain maximum flow rate. Obtaining the flooded areas stages is presented. Using 3D and raster calculations tools in every cross section, the water level corresponding at Q100% flow rate probability of exceeding is obtained. The results can give a three dimensional potential flooded view area, for each flow rate introduced. The sections cross density number give higher accuracy of flooding. These results may be helpful in urban space planning within the riparian localities.
Keywords: GIS data set, estimated maximum flow, digital terrain model, cross section, flooded area.