STUDI POTENSI DAERAH GENANGAN BANJIR DAS BELAWAN DENGAN SISTEM INFORMASI GEOGRAFIS (SIG)

Abstract

Belawan River Basin is one of the watershed which is currently undergoing land use change with increasing population and industrial development. High rainfall can cause rapid runoff, causing flood around the plains of the river cross section. The purpose of this research is to simulate the flood water level of Belawan Watershed with the flood discharge return period. Scope of activity in this research is analyzing maximum daily rainfall Belawan Watershed, analyzing daily rainfall maximum return period of 2 to 100 years, analyzing flood discharge of return period 2 to 100 years, and simulating flood water level with HECRAS. The result of the study shows that the potency of Belawan Watershed flood water level is caused by flood discharge at 25 to 100 years especially in the middle to downstream of river cross section that is between 0,7 m and 3,3 m.