Dwi Lestari, Martia (2018) INTEGRASI HEC-RAS 5.0.3 DAN GIS DALAM FLOODPLAIN MAPPING SUNGAI CILEMER (Studi Kasus Sub DAS Cilemer HM 53+00 Sampai HM 105+00). S1 thesis, UNIVERSITAS SULTAN AGENG TIRTAYASA.

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Abstract

The river as a complete completeness of the living environment serves as an ecosystem that makes life continue to run well. The increasing population growth in Indonesia influences topographic conditions and social conditions. Changes in the pattern of community behavior in maintaining river flow causes rivers to not function properly and cause flooding. Floods threaten and disrupt the lives and livelihoods of people, especially communities around the Cilemer River. This study aims to find out the flooded areas that are along the lower banks of the Cilemer River. The Peak Over Threshold method is used to find the planned flood discharge with a return period of 50 years. Flood modeling with HEC- GeoRAS helps provide an overview of flood affected maps on the Cilemer River HM 53+00 to HM 105+00. Modeling with integration from ARC-GIS and HEC-RAS, gave the result that the area affected by flood runoff had the highest water level elevation of +1,45 m using Steadyflow Analysis, and +10,71 m using Unsteadyflow Analysis. The flood discharge plan for the 50-year return period is used for the analysis of 196,058 m3/s. And after being compared with flood areas that have been mapped in mapping flood maps in Banten Province, this study shows that modeling is in accordance with the map of floods that have been mapped so that the integration of HEC-RAS and GIS programs has a very important role in flood research. Keywords: Flood discharge, SNI 2415: 2016, Peak Over Threshold Method, HEC-GeoRAS

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