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All Journal Jurnal Teknik Pengairan: Journal of Water Resources Engineering JURNAL SUMBER DAYA AIR
Lalu Sigar Canggih Ranesa, Lalu Sigar Canggih
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Civil Engineering, Building, Construction & Architecture Engineering

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Analisis Rasionalisasi Jaringan Pos Hujan Untuk Kalibrasi Hidrograf Pada Das Babak Kabupaten Lombok Tengah Ranesa, Lalu Sigar Canggih; Limantara, Lily Montarcih; Harisuseno, Donny
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 6, No 1 (2015)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (860.185 KB)

Abstract

Babak watershed is one of the major watersheds in Lombok with ± 259.166 km watershed area. Babak watershed is affected by 6 rainfall stations spread inside and outside the watershed. By using the standard of WMO (World Meteorological Organization) for mountainous area with the range of 100-250 km 2 /station for the tropics, assessment and analysis have been made and shown that two stations which did not fit the WMO standards of rain heading density. For example Keru and Jurang Sate Rainfall station, each of the station has an area of influence ± 60 km 2 . Furthermore, from the assessment and analysis using Kagan-Rodda method, there were two selected stations. While using Kriging method, there were three stations that have been chosen with one new placement inside the Babak watershed. Relative error of design rainfall for Kagan-Rodda method was between 2.36% -18.60% for every return period; whilst for Kriging method was between 7.90% - 13.57%. Hydrograph calibration result of Collins observation unit and Nakayasu synthetic unit rendered in α value of 1.27 for Babak watershed; relative error for Nakayasu design flood of Kagan-Rodda method for every return period was between 0.35% -18.21% while Kriging method was between 8.90% - 13.04%.Key Word : Rainfall stasiun,, Rationalization, WMO, Kagan-Rodda, Kriging, Collins.
Optimasi Pemodelan Hujan Limpasan dan Analisis Genangan Banjir untuk Evaluasi Dampak Infrastruktur DAS Rea Amitaba, Ida Wayan; Pramudiya, Asrul; Ahyadi, Hendra; Ranesa, Lalu Sigar Canggih
JURNAL SUMBER DAYA AIR Vol 21, No 2 (2025)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v21i2.970

Abstract

Flood disasters, with their increasingly common occurrence and shorter peak discharge times, have led to more significant runoff and elevated flood risks. Taliwang City, the economic center of West Sumbawa Regency, is particularly vulnerable to flooding, despite the presence of the natural reservoir, Lake Lebo Taliwang. The construction of the parallel Bintang Bano and Tiu Suntuk dam is expected to significantly reduce flood impacts. This study aims to analyze peak flood discharge and conduct flood inundation modeling to assess how reservoir routing from dam inflow and Lake Lebo Taliwang affects flood conditions in the Rea watershed. Flood discharge analysis was performed by converting rainfall data into flow hydrographs using HEC-HMS software, while flood inundation modeling was carried out using HEC-RAS (2D) software. The input for the HEC-RAS model included flood inflow from the Rea sub-watershed, differentiated by the 50-year return period (Q50) discharge, both before and after considering the effects of reservoir routing. The results showed a significant reduction in peak discharge for the Q50 return period post-dam construction, decreasing from 3,198.42 m³/s to 1,575.72 m³/s—a reduction of 50.73%. Additionally, the area affected by flooding shrank by a substantial 33.96%, from 4,016 hectares to 2,652 hectares, demonstrating the practical benefits of the dam construction. The depth of flooding along the riverbanks decreased from 1.14 meters to 0.63 meters, while it was reduced in Taliwang City from 0.42 meters to 0.08 meters.
Co-Authors Ahyadi, Hendra Amitaba, Ida Wayan Donny Harisuseno Lily Montarcih Limantara Pramudiya, Asrul