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Analisis Debit Banjir Rancangan dengan Metode HSS Nakayasu, HSS ITB-1, dan HSS Limantara pada DAS Manikin di Kabupaten Kupang Damayanti, Alvine Cinta; Limantara, Lily Montarcih; Haribowo, Riyanto
Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 2 No. 2 (2022): Jurnal Teknologi dan Rekayasa Sumber Daya Air (JTRESDA)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtresda.2022.002.02.25

Abstract

East Nusa Tenggara Province is a dry area where the rain season is relatively short and the rainfall intensity is low. This causes the production of food crops can not be maximized, even crop failure. The limited water resources in East Nusa Tenggara Province can be optimized by doing construction the Manikin Dam. In water resources planning, realistic flood discharge is needed by using the Synthetic Unit Hidrograph Method. The purpose of this research is to analyze the design flood discharge using the Methods of Synthetic Unit Hidrograph Nakayasu, ITB-1, and Limantara in Manikin Watershed of Kupang Regency. The calculation of the design flood discharge is carried out after obtaining the design rainfall value by using Normal, Log Normal, Gumbel, and Log Pearson Type III distribution methods. The results obtained are tested for suitability and the design rainfall value that passed can be use in the calculation of the design flood discharge. The results showed that the design flood discharge from the calculation of Nakayasu SUH method is 1597,16 m3/sec, that the design flood discharge from the calculation of ITB-1 SUH method is 965,64 m3/sec, and that the design flood discharge from the calculation of Limantara SUH method is 401,32 m3/sec. Based on the results, the value of the calculation of Nakayasu SUH method is the most suitable method and the closest to the conditions in the Manikin watershed.Provinsi Nusa Tenggara Timur merupakan daerah kering dimana musim basah (hujan) relatif pendek dan intensitas curah hujan yang kecil. Hal ini menyebabkan terjadinya produksi tanaman pangan tidak dapat maksimal, bahkan gagal panen. Terbatasnya sumber daya air di Propinsi Nusa Tenggara Timur dapat dioptimalkan dengan melakukan pembangunan Bendungan Manikin. Pada perencanaan bidang sumber daya air, dibutuhkan data debit banjir yang realistis dengan menggunakan Metode Hidrograf Satuan Sintetis. Penelitian bertujuan untuk menganalisis debit banjir rancangan dengan menggunakan ketiga metode Hidrograf Satuan Sintetis yaitu HSS Nakayasu, ITB-1, dan Limantara pada DAS Manikin di Kabupaten Kupang. Perhitungan debit banjir rancangan dilakukan setelah mendapat nilai hujan rancangan dengan menggunakan metode distribusi Normal, Log Normal, Gumbel, dan Log Pearson Type III. Hasil yang diperoleh diuji kembali kesesuaiannya dan nilai hujan rancangan yang lolos digunakan dalam perhitungan debit banjir Damayanti, A. C. et al., Jurnal Teknologi dan Rekayasa Sumber Daya Air Vol. 0 No. 0 (2021) p. 0-0 2 rancangan. Hasil penelitian menunjukkan bahwa nilai debit banjir rancangan perhitungan metode HSS Nakayasu sebesar 1597,16 m3 /det, debit banjir rancangan perhitungan metode HSS ITB-1 sebesar 965,64 m3 /det, dan debit banjir rancangan perhitungan metode HSS Limantara sebesar 401,32 m3 /det. Berdasarkan hasil analisis, nilai dari perhitungan metode HSS Nakayasu merupakan metode yang sesuai dan paling mendekati dengan kondisi di DAS Manikin.
Penentuan Parameter Model NRECA Untuk Debit Pada DAS Temef Krisnayanti, Denik Sri; Chandra, Chrystin; Bunganaen, Wilhelmus; Udiana, I Made; Damayanti, Alvine Cinta
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 1 (2022)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.776 KB) | DOI: 10.14710/mkts.v28i1.42035

Abstract

A watershed in which the observed discharge data is not available or incomplete becomes a problem in thewater utilization projects. Observation discharge data obtained from Pos Duga Air Sungai Temef is less reliable because the measurement of water level data for the last few years has been carried out by direct observation without using a discharge measuring device. Obtain river discharge data, it can be done by simulating rainfall data into discharge data, one of them is NRECA Model. In NRECA Model, there are several parameters, namely index soil moisture capacity (nominal), Percent Sub Surface (PSUB), Ground Water Flow (GWF), and crop coefficient (kc). Determination of the parameters NRECA Model was obtained by trial and error based on the value limit so that the coefficient correlation (r) between observation discharge and simulation discharge was close to 1. The values used for the index soil moisture capacity (nominal), percent sub surface (PSUB), ground water flow (GWF), and crop coefficient (kc) are 0,20; 0,85; 0,50; and 0,60.