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All Journal Borneo Engineering: Jurnal Teknik Sipil Publikasi Riset Orientasi Teknik Sipil (Proteksi)
Noordiah Helda
University of Lambung Mangkurat
Civil Engineering, Building, Construction & Architecture Transportation

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The Modelling Capacity of Tapin River using HEC-RAS 5.0.7 Application : PEMODELAN KAPASITAS TAMPUNGAN SUNGAI TAPIN DENGAN APLIKASI HEC-RAS 5.0.7 Dwi Surya Saputri; Noordiah Helda
PUBLIKASI RISET ORIENTASI TEKNIK SIPIL (PROTEKSI) Vol 8 No 1 (2026): Vol 8 No 1 Tahun 2026
Publisher : Universitas Negeri Surabaya

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Abstract

Flooding is an event that occurs when water inundates dry land or when a river's flow exceeds its capacity. According to the National Disaster Management Agency (BNPB), in 2021, flooding occurred in Tapin, triggered by heavy rainfall. To analyze the river’s capacity to handle floods, it is necessary to use hydraulic modeling through the HEC-RAS application, which provides insight into the river's ability to accommodate floods, particularly after the construction of the Tapin Dam. This study aims to analyze the flood discharge volume based on hydraulic analysis using HEC-RAS 5.0.7. The study uses secondary data, including Digital Elevation Model (DEM) data, Global Precipitation Measurement (GPM) satellite rainfall data, and Cross Section data. The method used for the calculation analysis is the Nakayasu Synthetic Unit Hydrograph method. Based on the hydraulic analysis results, the maximum flood discharge before the Tapin Dam construction, for return periods ranging from 2 to 100 years, is between 202.07 m³/s and 520.13 m³/s. Meanwhile, after the construction of the Tapin Dam, the maximum flood discharge for the same return periods is between 147.15 m³/s and 316.69 m³/s.
Evaluasi Data Satelit GPM (Global Precipitation Measurement) pada DAS Kemuning di Banjarbaru, Kalimantan Selatan Noordiah Helda; Nilna Amal; Humaira Afrila; Dwi Surya Saputri; Erisa Erisa; Muhammad Risky Maulana; Muhammad Irfan
Borneo Engineering: Jurnal Teknik Sipil Volume 9 Nomor 1 Tahun 2025
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v9i1.55

Abstract

In the hydrological cycle, rainfall is one of the vital components for the environment. Rainfall data plays an important role in determining the amount of runoff that occurs. Accurate and complete rainfall data estimates are needed in managing water resources; which are still limited, especially for watersheds with less field rainfall measurement stations. This study aims to analyze the use of satellite-based rainfall data, especially GPM (Global Precipitation Measurement) as an alternative rainfall data for watersheds with minimal observational rainfall data. In this study, secondary data collection was carried out by downloading observational rainfall data via BMKG Online and GPM satellite-based rainfall data for the period of 2018-2023. Several statistical methods were used to assess satellite performance and the relationship between BMKG and GPM data in Kemuning Watershed. From the results of the analysis, it can be seen that the correlation value between BMKG and GPM shows sufficient correlation (r = 0.45) and as much as 93% of GPM satellite data can be explained by BMKG data factors. Thus, GPM satellite data can be used as an alternative rainfall data, especially for watersheds with limited measurement stations.
Co-Authors Dwi Surya Saputri Dwi Surya Saputri Erisa Erisa Humaira Afrila Muhammad Irfan Muhammad Risky Maulana