scholarly journals Studi Penanggulangan Banjir Krueng Tripa

2019 ◽  
Vol 4 (1) ◽  
pp. 34-39
Author(s):  
Meliyana Meliyana ◽  
Ichsan Syahputra ◽  
Andhika Mahbengi ◽  
Cut Rahmawati

Krueng Tripa is located in 2 (two) regencies, namely Gayo Lues and Nagan Raya with total area of catchmen area is ± 3,472.95 Km2. The rainfall that affects Krueng Tripa watershed ranges from 493 mm up to 2,197 mm per year. the high rainfall effect on flood events that have caused adverse impacts on the lives of people along the river. The purpose of this study is to estimate peak flood discharge and to propose  flood control management. Analysis flood discharge using with Synthetic Unit Hydrograph (HSS) Soil Conservation Service (SCS).  The rainfall data test show that the rainfall distribution tend to follow the Gumbel, with the rate of design rainfall for 25-year return period to be 154,49 mm/day. Analysis of river flood discharge Krueng Tripa obtained Q25 = 3151,742 m3/s. The control flood recommendation of Krueng Tripa can be accomplished is a dam as flood control structure at the upstream of the river. Result of level pool routing obtained outflow hydrographs  2762,854 m3/s, resulting in a discharge reduction of 388.88 m3/s.

2018 ◽  
Vol 73 ◽  
pp. 08029
Author(s):  
Darsono Suseno ◽  
S Suripin ◽  
Budieny Hary ◽  
Cholifatul Afifah Risdiana ◽  
Pujiastuti Ratih ◽  
...  

Rawa Pening is a natural lake as a source of water for Tuntang River which is used for hydropower, raw water source, main irrigation water source in Glapan weir located in Grobogan District, Central Java provinces. Rawa Pening will be developed as location of national and international ecotourism. An Optimal Water Resources Management is required with several studies. This study is the beginning of a series of studies planned to determine the potential of embungs and its utilization as flood control, sediment control of Rawa Pening and for reducing weeds growth.


2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Ridwan Abadi Akbar ◽  
Adwitya Bhaskara

<p align="center"><strong>Abstract.</strong></p><p>Floods always come suddenly and unexpectedly, and lots of people living in the flood-prone area can be the victims. As happened on February 2, 2020, a number of rice fields, roads, and houses belonging to the residents in the Parangjoho watershed, Eromoko District, Wonogiri, with 9.8-km river length and 32.59-km<sup>2</sup> area, was flooded due to heavy rain for some time which flushed the Eromoko area, therefore, the river flow could not accommodate the volume of water that entered and overflowed. This was what motivated researchers to calculate the design flood discharge to be able to carry out the flood control.</p><p>The methods of calculating the design flood discharge in the Parangjoho watershed used the Nakayasu Synthetic Unit Hydrograph (SUH) Method and the Soil Conservation Service (SCS) Method, using the rainfall data from the Bengawan Solo Central River Region at Parangjoho Station. The rainfall data used were from 2000 to 2019.</p>


BANGUNAN ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 1
Author(s):  
Gilang Id'fi

Abstrak:Permasalahan banjir seringkali melanda wilayah DAS Kali Ngotok setiap tahun. Masalah banjir pada umumnya disebabkan oleh perubahan tata guna lahan dan penurunan fungsi sungai yang ada di wilayah DAS Kali Ngotok serta sering terjadinya back water dari sungai-sungai yang bermuara di Kali Brantas pada saat mengalami debit maksimal. Untuk itu studi perbandingan debit puncak banjir perlu dilakukan karena belum adanya penelitian mengenai pengendalian banjir. Sehingga dilakukan penelitian mengenai analisis model hidrograf satuan sintetik. Metode hidrograf satuan sintetik yang digunakan adalah SCS, Snyder, dan Nakayasu. Data hujan yang digunakan adalah data hujan tahun 1998-2016 dari 14 stasiun hujan di wilayah DAS Kali Ngotok. Metode poligon Thiessen digunakan untuk mengetahui besaran hujan yang tersebar di wilayah DAS Kali Ngotok. Besaran hujan rata-rata yang turun di DAS Kali Ngotok dalam kurun waktu 1998-2016 sebesar 97.05 mm. Pada tahap pemodelan, pembagian sub catchment DAS dilakukan dengan membagi menjadi 5 sub DAS. Hasil pemodelan dengan metode SCS, Snyder, dan Nakayasu menunjukkan besaran debit untuk kala ulang 2 tahun, 5 tahun, 10 tahun, 20 tahun, 25 tahun, 50 tahun, 100 tahun, dan 200 tahun yang bervariasi. Data AWLR yang mendekati hasil pemodelan adalah data tahun 2014. Hasil kalibrasi hidrograf untuk metode SCS dengan kala ulang 25 tahun sebesar 0.88, untuk metode Snyder dengan kala ulang 25 tahun sebesar 0.74, dan untuk metode Nakayasu dengan kala ulang 25 tahun sebesar 0.43. Dengan demikian model hidrograf SCS dengan kala ulang 25 tahun mendekati dengan model hidrograf lapangan berdasarkan data AWLR yang ada serta sesuai dengan hasil pengamatan pada saat survey penduduk.Kata-kata kunci: DAS, Kali Ngotok, SCS, Snyder, NakayasuAbstract: Flood problems often hit the Ngotok River watershed every year. The problem of flooding is generally caused by changes in land use and a decrease in river functions in the Ngotok River watershed area as well as frequent back water from rivers which empties into Brantas River when experiencing maximum discharge. For that reason a comparative study of peak flood discharge needs to be done because there is no research on flood control. So that research is conducted on the analysis of synthetic unit hydrograph models. The synthetic unit hydrograph method used is SCS, Snyder, and Nakayasu. Rainfall data used is data from 1998-2016 from 14 rain stations in the Ngotok River watershed. The Thiessen polygon method is used to determine the amount of rain scattered in the Ngotok River watershed. The average rainfall in the Ngotok River watershed in the period 1998-2016 was 97.05 mm. In the modeling phase, the sub catchment division of the watershed is carried out by dividing it into 5 sub catchments. The modeling results using the SCS, Snyder, and Nakayasu methods show the amount of discharge for the return period of 2 years, 5 years, 10 years, 20 years, 25 years, 50 years, 100 years, and 200 years which varies. AWLR data approaching the modeling results are 2014 data. The hydrograph calibration results for the SCS method with a 25 year return period are 0.88, for the Snyder method with a 25 year return period of 0.74, and for the Nakayasu method with a 25 year return period of 0.43. Thus the SCS hydrograph model with a 25 year return period approaches the field hydrograph model based on the AWLR data that exists and is in accordance with the observations during the population survey.Keywords: Watershed, Ngotok River, SCS, Snyder, Nakayasu


Pondasi ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 148
Author(s):  
Bayu Purnama Fitra ◽  
M. Faiqun Niam

ABSTRACT:Flooding problem still become serious problem in subdistrict Wonokerto of Pekalongan regency. There are six rivers that have the potential caused flooding in setelment area. In this research, the researcher wanted to do hydrological simulation at six rivers in Wonokerto. The hydrological simulation is done by calculating the inflow in the river in the form of flood discharge hydrograph design with nakayasu method, and evaluate the capacity of river catchment to flood discharge. Based the results research on six rivers, it is known that the river capacity is not able to accommodate the flood discharge when enters the river. The River water are also known  unable to flow by gravity caused of rob dikes that isolated the river water to flow into the sea, therefore to prevent overflow in the river needs and to prevent overflow and to control the river water level a pumping in rivers.Keywords: Hydrological Simulation, River Flood Control, Storage Evaluation, Pumping


Pondasi ◽  
2020 ◽  
Vol 23 (2) ◽  
pp. 13
Author(s):  
Bayu Purnama Fitra ◽  
Slamet Imam Wahyudi ◽  
Gata Dian Asfari

Abstract: Flooding problem still become serious problem in subdistrict Wonokerto of Pekalongan regency. There are six rivers that have the potential caused flooding in setelment area. In this research, the researcher wanted to do hydrological simulation at six rivers in Wonokerto. The hydrological simulation is done by calculating the inflow in the river in the form of flood discharge hydrograph design with nakayasu method, and evaluate the capacity of river catchment to flood discharge. Based the results research on six rivers, it is known that the river capacity is not able to accommodate the flood discharge when enters the river. The River water are also known  unable to flow by gravity caused of rob dikes that isolated the river water to flow into the sea, therefore to prevent overflow in the river needs and to prevent overflow and to control the river water level a pumping in rivers.Keywords: Hydrological Simulation, River Flood Control, Storage Evaluation, Pumping


2009 ◽  
Vol 9 (4) ◽  
pp. 1349-1363 ◽  
Author(s):  
D. Nijssen ◽  
A. Schumann ◽  
M. Pahlow ◽  
B. Klein

Abstract. As a result of the severe floods in Europe at the turn of the millennium, the ongoing shift from safety oriented flood control towards flood risk management was accelerated. With regard to technical flood control measures it became evident that the effectiveness of flood control measures depends on many different factors, which cannot be considered with single events used as design floods for planning. The multivariate characteristics of the hydrological loads have to be considered to evaluate complex flood control measures. The effectiveness of spatially distributed flood control systems differs for varying flood events. Event-based characteristics such as the spatial distribution of precipitation, the shape and volume of the resulting flood waves or the interactions of flood waves with the technical elements, e.g. reservoirs and flood polders, result in varying efficiency of these systems. Considering these aspects a flood control system should be evaluated with a broad range of hydrological loads to get a realistic assessment of its performance under different conditions. The consideration of this variety in flood control planning design was one particular aim of this study. Hydrological loads were described by multiple criteria. A statistical characterization of these criteria is difficult, since the data base is often not sufficient to analyze the variety of possible events. Hydrological simulations were used to solve this problem. Here a deterministic-stochastic flood generator was developed and applied to produce a large quantity of flood events which can be used as scenarios of possible hydrological loads. However, these simulations imply many uncertainties. The results will be biased by the basic assumptions of the modeling tools. In flood control planning probabilities are applied to characterize uncertainties. The probabilities of the simulated flood scenarios differ from probabilities which would be derived from long time series. With regard to these known unknowns the bias of the simulations was considered by imprecise probabilities. Probabilities, derived from measured flood data were combined with probabilities which were estimated from long simulated series. To consider imprecise probabilities, fuzzy sets were used to distinguish the results between more or less possible design floods. The need for such a differentiated view on the performance of flood protection systems is demonstrated by a case study.


Author(s):  
Jijian Lian ◽  
Junling He ◽  
Wenjuan Gou ◽  
Danjie Ran

The downstream nappe wind caused by flood discharge has a great influence on the rainfall distribution, the operational safety of dams, and their surrounding ecological environments. A physical experiment was conducted to measure the spatial distribution of the downstream nappe wind and the splash for a continuous bucket (CB) and a tongue-shaped bucket (TB) for five bucket angles (40°, 45°, 50°, 55°, and 60°). The experimental results demonstrate that the trajectory width and height of the nappe increase as the angles increase, but the effect on the length is converse. The wind velocity and splash weight of the two buckets decrease along the flowing direction. In the lateral direction, the wind velocity and splash weight for the CB decrease as y increases, but the wind velocity of the TB trends to humplike; its splash weight decreases near the axis of the bucket, and is stable in the other region. In the vertical direction, the velocity for the CB increases and then decreases as z increases, but that for the TB decreases monotonously. The velocity of the wind and weight of the splash for the CB decreases with the increasing angles, but those of the TB peak at 45°. The findings are useful for the more accurate prediction of rainfall.


2021 ◽  
Vol 894 (1) ◽  
pp. 012045
Author(s):  
A Sarminingsih ◽  
M Hadiwidodo

Abstract The planning of a flood control system in Indonesia is based on the planning criteria issued by the Ministry of Public Works. Flood control planning is based on flood discharge with a specific return period depending on the order of the river and the number of protected populations. Flood events in areas where the flood control system has been planned continue to occur almost every year, meaning that the probability of being exceeded is not as planned. This study is intended to evaluate the criteria for the magnitude of the designed flood discharge in flood control planning that considers the acceptable risk. Potential risks are evaluated against system reliability. The probability of failure of the flood control system occurs if the resistance is smaller than the load expressed as a performance function. By knowing the performance function associated with the level of flood risk, then the flood discharge can be selected with the appropriate return period according to the acceptable risk.


2021 ◽  
Vol 331 ◽  
pp. 07015
Author(s):  
Dian Pratiwi ◽  
Arniza Fitri ◽  
Arlina Phelia ◽  
Nabila Annisa Amara Adma ◽  
Kastamto

In the urban area, flooding becomes the most common disaster that has not been resolved until today. The utilization of river border area into housing and lack of absorption area becomes the trigger factor of urban flooding, as what is happening around Way Halim River on Seroja street. In this area, floods often happen during the rainy season, with the latest events recorded on January 21st, 2021. Analysis of flood intensities and discharges can be parameters for the decision-making of flood mitigation strategies. This study aims to analyze the flood discharges along Way Halim River, Seroja street by comparing the flood discharges resulting from three analysis methods of Synthetic Unit Hydrograph (SUH) including Gama I SUH, Nakayasu SUH, and Snyder SUH. Finally, suitable flood mitigation strategies were also proposed in this study based on the flood discharges and rain intensities. The results showed that Nakayasu SUH had the highest peak flood discharge than Snyder SUH and Gama I SUH. Based on the results of the investigation of land suitability; and analysis of rainfall intensities and flood discharges, the proposed flood mitigation in Seroja street is by installing biopore infiltration holes along Seroja street for storing water and reducing the risk of flooding in the area.


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