scholarly journals PERBANDINGAN BEBERAPA METODE DEBIT PUNCAK BANJIR RANCANGAN COMPARISON OF SOME PEAK DISCHARGE FLOOD DESIGN METHODS

GANEC SWARA ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 526
Author(s):  
HUMAIROH SAIDAH ◽  
ATAS PRACOYO ◽  
KHAIRUDIN KHAIRUDIN
Keyword(s):  
Design Method ◽  
Water Discharge ◽  
Peak Discharge ◽  
Design Flood ◽  
Flood Peak ◽  
Accuracy Test ◽  
Flood Discharge ◽  
Proper Design ◽  
Design Calculations ◽  
Selection Of

Peak discharge flood analysis is very crucial in waterworks design. The proper design flood discharge will produce effective construction dimensions as project requirement. Therefore, flood design calculations must be analyzed using appropriate methods. The problem in estimating design flood discharge is usually found in ungauged watersheds which do not have any water discharge measuring equipment.This study wants to test the flood design method using rain data input to be applied to the Babak River, so the result can be used as a guide in the selection of flood discharge calculation techniques in other ungauged watersheds.The accuracy test is carried out by comparing the results of these methods with the flood design resulted from a frequency analysis of the Annual Maximum Series. Based on the results of the calculation, the peak flood of the Harpers method has the smallest RE and RMSEP values are 8.960% and 88.546 respectively. Thus, it can be concluded that the calculation of the design of the flood peak Haspers method has the best accuracy of the analysis results when compared with the Melchior and Weduwen methods for Babak River.

scholarly journals ANALISIS BANJIR DAN TINGGI MUKA AIR PADA RUAS SUNGAI CILIWUNG STA 7+646 s/d STA 15+049

2018 ◽  
Vol 7 (1) ◽  
pp. 43-49
Author(s):  
Redaksi Tim Jurnal
Keyword(s):  
Frequency Analysis ◽  
Return Period ◽  
Synthetic Data ◽  
Gumbel Distribution ◽  
Peak Discharge ◽  
Design Flood ◽  
Distribution Method ◽  
Flood Peak ◽  
Method Of Calculation ◽  
Flood Discharge

The problem of flooding in DKI Jakarta is considered normal because almost every year can hit the city of Jakarta especially during the rainy season. In DKI Jakarta itself there are several rivers, one of which is Ciliwung River which is the most influential river in DKI Jakarta which often cause flood every year. The purpose of this research is to know the location of flood / river flood that occurs in the segments along Ciliwung River STA 7 + 646 s / d STA 15 + 049. Data processing begins with the calculation of average rainfall, frequency analysis, and then hour-time rain distribution. Method of calculation of flood discharge using the synthetic unit of Nakayasu and Gama I synthetic data. Rainfall data using 2 observation stations for 3 years rain (2014-2016). In the frequency analysis used Gumbel distribution berdasrkan test results suitability data Smirnov- Kolmogorov and Chi-Square. The result of flood peak discharge design with HSS Nakayasu on return period Q5 = 687,80 m3 / dt, Q10 = 743,21 m3 / dt, Q20 = 796,36 m3 / s, Q50 = 865,15 m3 / dt, Q100 = 916,71 m3 / s, while flood peak discharge design with HSS Gama I on return period Q5 = 347,03 m3 / s, Q10 = 372,12 m3 / s, Q20 = 396,20 m3 / s, Q50 = 427, 36 m3 / s, Q100 = 450,71 m3 / s. The design flood discharge value approaching the measured debit value is HSS Nakayasu. Steps continued using HEC-RAS 4.1.0 software to determine the capacity of river catchment by using Nakayasu discharge. After analyzing using the software, most stationing of the Ciliwung River at STA 7 + 646 to STA 15 + 049 can not accommodate the planned discharge during the 20th anniversary period, hence the need for river improvements in the form of river normalization and elevation of dikes.

scholarly journals Deriving Design Flood Hydrograph Based on Conditional Distribution: A Case Study of Danjiangkou Reservoir in Hanjiang Basin

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Changjiang Xu ◽  
Jiabo Yin ◽  
Shenglian Guo ◽  
Zhangjun Liu ◽  
Xingjun Hong
Keyword(s):  
Joint Probability ◽  
Flood Frequency ◽  
Peak Discharge ◽  
Flood Frequency Analysis ◽  
Design Flood ◽  
Copula Functions ◽  
Danjiangkou Reservoir ◽  
Flood Peak ◽  
Flood Hydrograph

Design flood hydrograph (DFH) for a dam is the flood of suitable probability and magnitude adopted to ensure safety of the dam in accordance with appropriate design standards. Estimated quantiles of peak discharge and flood volumes are necessary for deriving the DFH, which are mutually correlated and need to be described by multivariate analysis methods. The joint probability distributions of peak discharge and flood volumes were established using copula functions. Then the general formulae of conditional most likely composition (CMLC) and conditional expectation composition (CEC) methods that consider the inherent relationship between flood peak and volumes were derived for estimating DFH. The Danjiangkou reservoir in Hanjiang basin was selected as a case study. The design values of flood volumes and 90% confidence intervals with different peak discharges were estimated by the proposed methods. The performance of CMLC and CEC methods was also compared with conventional flood frequency analysis, and the results show that CMLC method performs best for both bivariate and trivariate distributions which has the smallest relative error and root mean square error. The proposed CMLC method has strong statistical basis with unique design flood composition scheme and provides an alternative way for deriving DFH.

scholarly journals Studi Ketercukupan Kapasitas Saluran Jalan Pada Jalan Dengan Kelandaian Cukup Tinggi (Studi Kasus Jalan Kawah Ijen, Bondowoso)

2021 ◽  
Vol 9 (2) ◽  
pp. 109-115
Author(s):  
Noor Salim
Keyword(s):  
Water Discharge ◽  
Rectangular Channel ◽  
Daily Rainfall ◽  
Design Flood ◽  
The Road ◽  
Smooth Flow ◽  
Flood Discharge ◽  
Discharge Plan ◽  
Drainage Design ◽  
Comprehensive Study

Stagnant water in the highway area is the cause of disruption of the smooth flow of vehicle traffic. Even the overflowing of air from the road creates a large flood supply in the road area. The problem of flooding in the Ijen Bondowoso crater road area was also triggered by the inability of the channel that functions to fill the flood water discharge that occurs in this road area. From this problem, it is necessary to study regarding the adequacy of the capacity of the road channel on roads with a fairly high slope such as what happened in the area of Ijen Crater road, Bondowoso From the results of this study it can be seen that the average daily rainfall is the result of 100,461 mm and the relative average rainfall intensity of each channel for the 10 year return period is 63,301 mm / hour. The flood discharge plan is calculated from 2 to 100 years. In this drainage design analysis, the design flood discharge is calculated for only 10 years, and a planned flood discharge is obtained of 0.423 m3 / second. The channel required to fill the flood discharge is a rectangular channel with the size B = H = 0.6 m. It is recommended to always carry out a comprehensive study with regard to changes in the road body of the road along with the increase in existing traffic. As well as the infrastructure of the existing channel and feeding the community around the road, it will be clean and not littering, especially in the road channel

scholarly journals Estimating the design flood under the influence of check dams by removing nonstationarity from the flood peak discharge series

2020 ◽  
Vol 51 (6) ◽  
pp. 1261-1273
Author(s):  
Shi Li ◽  
Yi Qin ◽  
Yixiu Liu ◽  
Xiaoyu Song ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
Bootstrap Method ◽  
Peak Discharge ◽  
Runoff Generation ◽  
Design Flood ◽  
Flood Peak ◽  
Second Moments ◽  
Check Dams ◽  
Function Relationship ◽  
Basin Area

Abstract The construction of check dams in northwestern China has resulted in nonstationary changes in flood peak discharge series; the stationary assumption of the conventional hydrological frequency analysis is no longer satisfied. According to the characteristics of the construction and operation of check dams, the nonstationarity of flood peak discharge series are largely induced by changes in the effective runoff generation area (i.e., the basin area minus the area controlled by check dams). Knowing the power function relationship between the flood peak discharge and the basin area, we can remove the influence of the effective runoff generation area and convert the original nonstationary series into a stationary series. This de-nonstationarity method can achieve stationarity in the first and second moments simultaneously. Therefore, we can calculate the design value of the reconstructed series using the conventional frequency analysis method. According to the effective runoff generation area under design conditions, we can then obtain the corresponding design flood of the original series. We applied this method to the Mahuyu River basin to obtain the design flood under nonstationarity. Due to the consideration of the deterministic influence of check dams during the de-nonstationarity process, the uncertainty analyzed by the bootstrap method is obviously small.

A Geomorphic Approach to the Design of Pipeline Crossings of Mountain Streams

2004 ◽  
Author(s):  
Matthias Jakob ◽  
Michael Porter ◽  
K. Wayne Savigny ◽  
Eugene Yaremko
Keyword(s):  
Return Period ◽  
Debris Flows ◽  
Peak Discharge ◽  
Hydrological Processes ◽  
Mountain Streams ◽  
Design Flood ◽  
Fluvial Process ◽  
Flood Discharge ◽  
Outburst Floods ◽  
Pipeline Crossing

Several hydrological methods are available to determine flood discharge and scour of streams at pipeline crossings. These methods are appropriate for streams dominated by purely hydrological processes, but fail where other, more hazardous processes occur within the design recurrence interval. Several investigations have shown that scour, impact and aggradation associated with debris flows, outburst floods or related phenomena may fundamentally change the parameters needed for proper pipeline crossing design. Depending on the process type, the peak discharge of the hazardous process can exceed that of the design flood (typically 50 to 200 year return period) by a factor of 2 to 50. Similarly, scour or aggradation by a non-fluvial process can exceed the hydrologically-derived estimates by several factors. It is therefore recommended that a geomorphic approach be taken in recognizing and quantifying the potential for non-fluvial processes and that the findings be integrated in the design of pipeline crossings.

scholarly journals DAS Ampal Analisa Fungsi dan Pengaruh Bangunan Pengendali Banjir DAS Ampal Kota Balikpapan

2018 ◽  
Vol 2 (3) ◽  
pp. 39
Author(s):  
Rossana Margaret Kadar Yanti ◽  
Edijatno Edijatno ◽  
Umboro Lasminto
Keyword(s):  
Catchment Area ◽  
Flood Control ◽  
Peak Discharge ◽  
Flood Peak ◽  
Flood Discharge ◽  
Main River ◽  
The Difference

Ampal Catchment Area has 25.273 km2 area and 4.699 km main river length, which planned to have 13 flood control construction. Until 2017, this catchment area has only three flood control construction. The watershed has only three built-in batters that are used to reduce the amount of flood discharge flowing on the Ampal river. Based on these conditions, it is necessary to analyze the magnitude of the difference of flood peak discharge on the existing condition (three bendali) compared with the condition of the plan (thirteen bendali). Therefore, analyzed the function and influence of flood control construction in Ampal Catchment Area by counting the flood peak discharge in each condition. From the analysis result, obtained the amount of peak discharge flowing in Ampal river existing condition is equal to 170,40 m3/s while at the condition of plan is equal to 83,80 m3/s. From the results of analysis, it is stated that the magnitude of the decrease of debit (ΔQ) after all the builds is 86.60 m3/s.

scholarly journals Intensity-Duration-Frequency (IDF) Curve and the Most Suitable Method to Determine Flood Peak Discharge in Upper Werba Sub-Watershed

2019 ◽  
Vol 21 (2) ◽  
pp. 70-75
Author(s):  
Cilcia Kusumastuti ◽  
Prasetio Sudjarwo ◽  
Marvin Christhie ◽  
Timotius Krisna
Keyword(s):  
Rainfall Intensity ◽  
Flood Frequency ◽  
Rational Method ◽  
Flood Frequency Analysis ◽  
Unit Hydrograph ◽  
Design Flood ◽  
Flood Peak ◽  
Flood Discharge ◽  
Design Rainfall ◽  
Intensity Duration Frequency

Design flood is one of the important factors for flood risk assessment and water infrastructures planning and development in a certain location. There are several methods to estimate it, one method which has been commonly and widely use is using flood frequency analysis. This research aims to develop Intensity-Duration-Frequency (IDF) curves in Upper Werba Sub-Watershed, West Papua Province, Indonesia, to estimate design rainfall intensity. The design rainfall intensity is used to estimate peak of flood discharge using Rational Formula in the sub-watershed. Other methods, i.e. Soil Conservation Service and Nakayasu Synthetic Unit Hydrograph are also presented in this paper to provide comparison of the estimated peak of flood discharge. The result shows that the Rational method provide the closest magnitude of estimated flood discharge in Upper Werba Sub-Watershed to the observed streamflow. Therefore, it is suggested that the Rational method can be used for water infrastructure planning and development in the sub-watershed.

scholarly journals Pengaruh Pemilihan Kala Ulang Debit Banjir Rancangan Metode HSS Nakayasu Terhadap Dimensi Sand Pocket Di Gunung Merapi

2020 ◽  
Vol 5 (1) ◽  
pp. 80
Author(s):  
Imam Sudrajad ◽  
Yeri Sutopo ◽  
Agung Sutarto
Keyword(s):  
Building Design ◽  
Design Flood ◽  
Observation Site ◽  
Discharge Data ◽  
Effective Height ◽  
Central Java ◽  
Flood Discharge ◽  
Different Dimensions ◽  
Base Width ◽  
Selection Of

Design of flood discharge becomes an important parameter in water building design planning. When analyzing the design of flood discharge, re-selection is crucial because it will determine the magnitude of the design flood discharge. Election times are adjusted to the characteristics of the Watershed (DAS). The location of the Sand Pocket plan is in Woro river, Klaten, Central Java. The unavailability of design flood discharge data at the observation site resulted in the design flood discharge analysis being carried out. This study focuses on comparing the magnitude of flood designs from different times, namely Q5th, Q10th, Q25th, Q50th, and Q100th. After the flood discharge is obtained then it is used to calculate the dimensions of the Sand Pocket building. Each time that is used to calculate dimensions produces different dimensions in the building. The dimensions of the building that are affected in Main Dam and Sub Dam are effective height, upstream slope (m), flow height above the Main Dam, guard height, foundation depth, and the base width of the Main Dam and Sub Dam. In the appron is the length of the floor and the thickness of the appron floor. Then the last is the upstream side of the Main Dam wing. The selection of re-ordering determines the amount of discharge that will be generated and also affects the dimensions of the Sand Pocket that will be planned.ABSTRAKDebit banjir rancangan menjadi parameter penting dalam perencanaan desain bangunan air. Saat analisis debit banjir rancangan, pemilihan kala ulang menjadi hal yang krusial karena akan menentukan besarnya debit banjir rancangan. Pemilihan kala ulang disesuaikan dengan karakteristik Daerah Aliran Sungai (DAS). Lokasi rencana Sand Pocket berada di kali Woro, Klaten, Jawa Tengah. Tidak tersedianya data debit banjir rancangan pada lokasi pengamatan mengakibatkan analisis debit banjir rancangan ini dilakukan. Penelitian ini berfokus untuk membandingkan besaran debit banjir banjir rancangan dari kala ulang yang berbeda yaitu Q5th, Q10th, Q25th, Q50th, dan Q100th. Setelah debit banjir didapatkan kemudian digunakan untuk menghitung dimensi bangunan Sand Pocket. Setiap kala ulang yang digunakan untuk menghitung dimensi menghasilkan dimensi bangunan yang berbeda di beberapa bagian. Bagian dimensi bangunan yang terpengaruh pada Main Dam dan Sub Dam adalah tinggi efektif, kemiringan hulu (m), tinggi aliran di atas mercu, tinggi jagaan, kedalaman pondasi, dan lebar dasar Main Dam dan Sub Dam. Pada kolam olak adalah panjang lantai dan tebal lantai kolam. Kemudian yang terakhir adalah kemiringan sisi hulu sayap Main Dam. Pemilihan kala ulang menentukan besaran debit yang akan dihasilkan dan berpengaruh pula terhadap dimensi Sand Pocket yang akan direncakanan.

The Influence of Geographical Factors on Extreme Rainfalls in Lampung Province

2019 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
M Welly
Keyword(s):  
Geographical Location ◽  
Daily Rainfall ◽  
Extreme Rainfall ◽  
Design Flood ◽  
Extreme Rainfall Events ◽  
Rainfall Events ◽  
Ungauged Basin ◽  
Flood Discharge ◽  
Design Rainfall ◽  
Geographical Factors

Many people in Indonesia calculate design rainfall before calculating the design flooddischarge. The design rainfall with a certain return period will eventually be convertedinto a design flood discharge by combining it with the characteristics of the watershed.However, the lack of a network of rainfall recording stations makes many areas that arenot hydrologically measured (ungauged basin), so it is quite difficult to know thecharacteristics of rain in the area concerned. This study aims to analyze thecharacteristics of design rainfall in Lampung Province. The focus of the analysis is toinvestigate whether geographical factors influence the design rainfall that occurs in theparticular area. The data used in this study is daily rainfall data from 15 rainfallrecording stations spread in Lampung Province. The method of frequency analysis usedin this study is the Gumbel method. The research shows that the geographical location ofan area does not have significant effect on extreme rainfall events. The effect of risingearth temperatures due to natural exploitation by humans tends to be stronger as a causeof extreme events such as extreme rainfall.Keywords: Influence, geographical, factors, extreme, rainfall.

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