The effects of river normalization on flood risk

A river is a naturally occurring flow system that flows from upstream to downstream. Rivers have many benefits. Similarly, rivers negative impact if rainfall high. It can lead catastrophic flooding. Flooding often occurs along the central roads of Padang City when it rains, especially in Maransi and Aie Pacah areas. The purpose this study estimate height water level by using software HEC – RAS areas potential for flooding conditions before after normalization Arc-GIS. Data collection carried out achieve goal, namely maximum daily data, Digital Elevation Model (DEM) data obtained processing aerial photo cross-sectional river. Then, numerical simulation performed level, then determine extent flood area. results are form with period 25, 50, 100 years be used see effectiveness work