Imulasi Pengendalian Banjir Pada Perkebunan Kelapa Di Sungai Undan (Studi Kasus: Desa Sei Undan Kabupaten Indragiri Hilir)

Abstract

The coconut plantation area on the banks of the Undan river is not function optimally. It can be seen from the inability of the river in flowing runoff discharge. The floods caused many dead coconut trees and disrupted the activities of residents in Sei Undan Village. Flood simulation analysis is done by analyzing the capacity of the river channel and comparing the calculated discharge it with rational method. Analyze channel calculation using HEC-RAS 4.1.0 software. Profile analysis is done by dividing into 2 river channels that reach A and B with 3 different reset times, is 5 years, 10 years, and 25 years. The result of this research can be seen that the existing condition with maximum height in reach B is 30 cm for return periode of 5 years, 30 cm for return periode of 10 years and 30 cm for return periode of 25 years and to reach A that is 19 cm for return periode of 5-years, 34 cm for return periode of 10 years, and 27 cm for return periode of 25 years. Simulation by constructing a levee on the riverbank by looking for Maximum inundation height with a higher levee size than the maximum inundation.
Keywords: Flood, Rational Method, HEC-RAS 4.1