Abstract
This study aims to develop a flood forecasting model for Air Bengkulu based on Synthetic Unit Hydrograph and HEC HMS. Rainfall data were obtained from the River Region VII Regional Office of Bengkulu Province, from 2000 to 2021. The Synthetic Unit Hydrograph (SUH) method used to estimate the discharge was a synthetic unit hydrograph, namely GAMA-1. Flood simulation was carried out using HEC-HMS software. The peak discharge value produced by HEC-HMS is 690 ms-1 while the peak discharge value from SUH GAMA-1 is 319.23 m s-1. The peak discharge value of the Air Bengkulu flood produced by both SUH GAMA-1 and HEC-HMS has been able to represent the value of the flood discharge of the Air Bengkulu Watershed. This study concludes that SUH GAMA-1 and HEC HMS have been able to model the flood event on April 29, 2019, that occurred in the Air Bengkulu watershed. Validation of the model needs to be studied continuously so that it can produce a model that can represent the actual flood events in Air Bengkulu.
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