sminesa, intan (2025) Analisis Dbit banjir Menggunakan Pemodelan HEC-HMS Pada DAS Bendungan Bagong, Trenggalek. Undergraduate thesis, UPN VETERAN JAWA TIMUR.
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Abstract
Bagong Dam in Trenggalek Regency is a vital infrastructure serving both as flood control and as a water supply for the community and agricultural irrigation. In recent years, shifts in rainfall patterns and increasing intensity of extreme precipitation events have heightened the flood risk in areas surrounding the dam. This study aims to analyze flood discharge and determine the peak discharge value in the Bagong Dam catchment area (DAS) using HEC-HMS modeling based on rainfall data from 2010 to 2023. The research method begins with processing annual rainfall data from three rain stations using the Thiessen Polygon method to obtain representative average rainfall over the watershed. Frequency analysis was then conducted with four probability distributions; the Log Pearson III distribution was selected as the most suitable for determining the design rainfall for various return periods. The design rainfall was distributed into hourly values using the Mononobe method and then converted into effective rainfall with the Alternating Block Method (ABM). Key hydrological parameters, such as Curve Number (CN), lag time, and impervious area percentage, were input into the HEC-HMS model for flood discharge simulation. Simulation results show that peak flood discharge (Qp) increases in accordance with the return period, starting from 22.9m³/s for a 2-year return period to 45.0m³/s for a 100-year return period, with the peak flow consistently occurring at 13:30. The resulting flood hydrograph accurately represents the actual response of the Bagong watershed to extreme rainfall events. The HEC-HMS model proved effective as a primary tool for flood planning and mitigation, and serves as a technical reference for data-driven water resource management at Bagong Dam. Keywords : Bagong Dam, Rain, Flood, HEC-HMS
| Item Type: | Thesis (Undergraduate) | ||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||
| Divisions: | Faculty of Engineering > Departement of Civil Engineering | ||||||||
| Depositing User: | intan sminesa | ||||||||
| Date Deposited: | 15 Sep 2025 02:47 | ||||||||
| Last Modified: | 15 Sep 2025 02:47 | ||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/43470 |
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