Analisa Hidrograf Satuan Sintetik Nakayasu Dan ITB Pada Sub DAS Konto, Jawa Timur

Margini, Nastasia Festy; Nusantara, Danayanti Azmi Dewi; Ansori, Mohamad Bagus

doi:10.12962/jh.v2i1.4401

Cited by 13 publications

(11 citation statements)

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“…Figure 3 describes the 4 frequency distributions with a normal distribution resulting in R2 of 94.10 mm; R5 of 110.70; R10 for 119.40 mm; R25 of 127.86 mm; R50 of 134.62 mm; R100 is 140.15 mm, log normal distribution produces R2 of 92.20 mm; R5 of 110.42; R10 of 121.36 mm; R25 of 133.04 mm; R50 of 143.18 mm; R100 of 152.05 mm, pearson III log distribution produces R2 of 92.58 mm; R5 of 110.54 mm; R10 of 121.25 mm; R25 of 133.38 mm; R50 of 141.56 mm; R100 is 149.30 mm, the Gumbel distribution produces R2 of 91.40 mm; R5 of 115.24 mm; R10 of 131.02 mm; R25 of 150.96 mm; R50 of 165.75 mm; R100 is 180.43 mm, then the goodness of fit test method is tested with the dispersion test of the skewness coefficient value of 0.0505 <1.1396, the kurtosis coefficient of 1.8641 <5,4002, the Kolmograov and Smirnov distribution test obtained a Dmax value of 0.1643 <Dcr of 0.32, and the chi squared test (χh2 count of 1 <χh2 Critical of 5.991 is used to analyze flood discharge times using the Nakayashu method with a river basin area of 298.89 km2 with a flow coefficient (Cw DAS langsa ) of 0.48 and the length of the river is 62.8 km with the assumption of rain for 6 hours [14] with a rain ratio of 55% for the 1st hour, 15% for the second hour, 11% for the 3rd hour and 5 by 7%, and the 6th hour of 5% produces runoff discharge during the HSS Nakayashu plan in Figure 4. [19] where the estimated flood impact and flood risk costs are shown in Table 3.…”

Section: Resultsmentioning

confidence: 99%

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A Flood Water Level and Risk Analysis in Langsa River Aceh Province

Ismida¹,

Isma²,

Fajri³

et al. 2021

Advances in Social Science, Education and Humanities Research

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Langsa river that crosses the city during high rainfall often experiences flooding around the river's border. This is due to the river which is not being able to accommodate the excess discharge so that the overflow of water has a negative impact on the facilities and infrastructure around the river. In addition, flooding is also affected by the damage of Langsa watersheds which is characterized by a decrease in the ability of storing the water. There are few information available regarding the high potential impact and inundation of floods in detail caused by flood discharge plan, so that this investigation aims to determine the height and inundation of floods for a return period of 5 and 100 years as a basic information in flood disaster mitigation in Langsa City. The scope of the analysis was carried out by several methods, namely the analysis of the maximum rainfall frequency distribution with the normal distribution method, log normal, log-Pearson type III, and Gumbel, periodic analysis of planned flood discharge with the Nakayashu Synthetic Unit Hydrograph method and analysis of water level and flood inundation with the help of HECRAS 5.01 and GIS software to encounter the risk of flood inundation of the stream. The results of this study denote that the flood discharge which occurs in the river due to the maximum daily rainfall (CH) based on the Gumbel distribution results in a flood discharge (Q5) of 361.21 m3/second with a water level of 1.0 meter. Meanwhile, the flood discharge (Q100) produces 564.65 m3/second with a flood water level of 3.0 meters and 33.86 square kilometers area of indunation. Moreover, with the availability of discharge information (Q100), it is predicted that 15 villages are potentially affected by flooding. The proposed analysis has auspicious value in the practical implementation of flood disaster mitigation in Langsa City.

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Section: Resultsmentioning

confidence: 99%

“…Synthetic Unit Hydrograph (HSS) Nakayasu (1950) has investigated the Japanese unit hydrograph and provided a set of equations to form a unit hydrograph as follows [6,11,14,15]: tg = 0 4 + 0.058 x L (untuk L > 15 km ) ( 7) tg = 0.21 x L 0.7 ( untuk L < 15 km ) (…”

Section: Materials and Methodologymentioning

confidence: 99%

A Flood Water Level and Risk Analysis in Langsa River Aceh Province

Ismida¹,

Isma²,

Fajri³

et al. 2021

Advances in Social Science, Education and Humanities Research

View full text Add to dashboard Cite

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“…Indonesia merupakan negara tropis sehingga memiliki karakteristik DAS dan curah hujan yang sangat berbeda dengan daerah tempat ketiga model tersebut dirumuskan, sehingga hasil analisis yang diperoleh kurang optimal (Tunas, 2019). Di Indonesia model hidrograf juga mulai dikembangkan oleh beberapa peneliti maupun akademisi seperti Gama 1, Limantara, ITB-1, ITB-2, ITS-1 dan yang terbaru ITS-2 (Margini, 2017).…”

Section: Pendahuluanunclassified

Debit Banjir Rancangan DAS Tojo Metode HSS ITB 1

2020

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Floods often occur in several regions in Indonesia. The problem is the flooding with its uncertain characteristics is one of the environmental problems that has not been handled optimally. The method of converting rain data into discharge data for flood analysis has been widely presented in previous studies. The methods used to analyze flood discharge also vary, starting from rational, empirical, statistical models to the unit hydrograph model. This research aims to determine the flood discharge design for return periods 2, 5, 10, 20, 25, 50, and 100 years in Tojo watershed, Tojo Una-una Regency using the synthetic unit hydrograph method of ITB-1. Research methods are data collection and data analysis. Data collection was carried out at several agencies and collecting from online sources. Results of this research design flood discharge that was analyzed by synthetic unit hydrograph of ITB-1 method. The maximum design flood discharge at Tojo watershed are 82.375m3/s for a 2-year, 98.21 m3/s for a 5-year, 104.77 m3/s for a 10-year, 111.83 m3/s for a 20-year, 113.3 m3/s for a 25-year, 118.87 m3/s for a 50-year, 123.86 m3/s for a 100-year return period

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“…A hydrograph must be adjusted by observing and analyzing hydrology to determine the characteristics in a watershed. Some popular hydrograph methods include ITB, GAMA-1, SCS, ITS-1, ITS-2 and Nakayasu [1]. The method used in this study is Nakayasu Synthetic Unit Hydrograph method.…”

Section: Introductionmentioning

confidence: 99%

Design Flood Discharge of 50 Years in Garang River Using Nakasayu Synthetic Unit Hydrograph Method

Maulana

Sutopo

2020

JTSP

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Various kinds of buildings in civil engineering require careful planning. For example, in the planning of a water building needed a method to calculate the design flood discharge before starting to plan the dimensions of the building to meet the effectiveness of the water structure. Design flood discharge can be determined using several hydrograph methods that have been used in water building planning in Indonesia. One of the popular hydrograph method used is the Nakayasu Synthetic Unit Hydrograph method. In this case, the design flood discharge is located in the Garang watershed, precisely in Semarang City, province of Central Java, using rainfall data for the past 16 years. Hydrological analysis is carried out first before determining the design flood discharge with a return period of 2, 5, 10, 25, and 50 years. The results of the design flood discharge using Nakayasu method respectively were 305,522 m3/s, 390,742 m3/s, 447,783 m3/s, 520,560 m3/s, and 574,912 m3/s.

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Analisa Hidrograf Satuan Sintetik Nakayasu Dan ITB Pada Sub DAS Konto, Jawa Timur

Cited by 13 publications

References 0 publications

A Flood Water Level and Risk Analysis in Langsa River Aceh Province

A Flood Water Level and Risk Analysis in Langsa River Aceh Province

Debit Banjir Rancangan DAS Tojo Metode HSS ITB 1

Design Flood Discharge of 50 Years in Garang River Using Nakasayu Synthetic Unit Hydrograph Method

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