scholarly journals Conformity evaluation of synthetic unit hydrograph (case study at upstream Brantas sub watershed, East Java Province of Indonesia)

2017 ◽  
Vol 35 (1) ◽  
pp. 173-183 ◽  
Author(s):  
Dwi Priyantoro ◽  
Lily Montarcih Limantara
Keyword(s):  
Water Resources ◽  
Unit Hydrograph ◽  
Time Of Concentration ◽  
Main River ◽  
Synthetic Unit Hydrograph ◽  
The Difference

AbstractThis study intends to analyse the suitable hydrograph in upstream Brantas sub watershed. The methodology consists of comparing the result of hydrograph due to the methods of Nakayasu synthetic unit hydrograph (SUH), Limantara synthetic unit hydrograph, and the observed unit hydrograph. In detail, this study intends to know the difference of hydrograph parameters: α and Tg as recommended by Nakayasu and in the study location; to know the influence of main river length which is used in the methods of Nakayasu and Limantara to the time of concentration; to know the hydrograph ordinate deviation between Nakayasu and Limantara due to the observed hydrograph. Result is hoped for recommending the suitable hydrograph in upstream Brantas subwatershed so that it can be used accurately for the further design of water resources structure.

scholarly journals Analysis of urban flood using synthetic unit hydrograph (SUH) and flood mitigation strategies along way Halim River: a case study on Seroja street, Tanjung Senang District

2021 ◽  
Vol 331 ◽  
pp. 07015
Author(s):  
Dian Pratiwi ◽  
Arniza Fitri ◽  
Arlina Phelia ◽  
Nabila Annisa Amara Adma ◽  
Kastamto
Keyword(s):  
Mitigation Strategies ◽  
Flood Mitigation ◽  
Trigger Factor ◽  
Urban Flooding ◽  
Unit Hydrograph ◽  
Urban Flood ◽  
Flood Discharge ◽  
Absorption Area ◽  
Synthetic Unit Hydrograph

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.

Mathematical modeling of synthetic unit hydrograph case study: Citarum watershed

2015 ◽  
Author(s):  
Muhammad Islahuddin ◽  
Adiska L. A. Sukrainingtyas ◽  
M. Syahril B. Kusuma ◽  
Edy Soewono
Keyword(s):  
Mathematical Modeling ◽  
Unit Hydrograph ◽  
Synthetic Unit Hydrograph

scholarly journals Alpha Modeling of Nakayasu Synthetic Unit Hydrograph for Part of Watersheds in Indonesia

2019 ◽  
Vol 8 (4) ◽  
pp. 5509-5514
Keyword(s):  
Water Resources ◽  
Hydraulic Structure ◽  
Time Base ◽  
Unit Hydrograph ◽  
Design Flood ◽  
Characteristic Factor ◽  
Great Utility ◽  
Synthetic Unit Hydrograph ◽  
Watershed Characteristic ◽  
Flood Analysis

The lacks of hydrograph data in the field has become the drawback of the hydraulic structure planning. However, such a conditional deficiency in particular, has urgently placed the Synthetic Unit Hydrograph (SUH) models to be very great utility. The Synthetic Unit Hydrograph (SUH) is a popular model that is used in many water resources designs especially in design flood analysis in ungagged watershed. One of the SUH that is usually used in Indonesia is Nakayasu SUH. This model is depended on the α parameter that is influencing the unit hydrograph ordinate and time base. This research intends to build a model of α parameter that is as the characteristic factor of part of watersheds in Indonesia. The methodology consists of observed unit hydrograph analysis for obtaining the α parameter in each watershed, to collect the characteristic data in each watershed, and then to formulate the α parameter model that is as the function of watershed characteristic. The result is formulation model of α that can be used to analyze the design flood in the watershed in Indonesia

scholarly journals A Combination between Synthetic Unit Hydrograph (SCS) and Rational Method in a similar Conditions Water Shed

2021 ◽  
Vol 9 (3) ◽  
Author(s):  
Mona Fathi ◽  
Neveen B. Abelmageed ◽  
M. Hassan
Keyword(s):  
Rational Method ◽  
Rainfall Data ◽  
Return Periods ◽  
Unit Hydrograph ◽  
Engineering Applications ◽  
Watershed Characteristics ◽  
Time Of Concentration ◽  
Excess Water ◽  
The Difference ◽  
Peak Runoff

Studying watershed characteristics and choosing the most applicable methods to determine the amount of access rainfall that ran off is very important in many engineering applications, especially hydrology applications. That is to know the more suitable methods for protection against floods and to maximize benefits from the excess water. This study aims to establish a relation between the rational method and the SCS method. A subbasin in Wadi Dahab in Sinai, Egypt is investigated as a study area. To achieve the study aims, HEC-WMS software is chosen, which can analyze a watershed by using DEM and delineating basin. It calculates also important watershed parameters like area, runoff distances, and slope. The rainfall data is compiled and arranged. A statical analysis is executed to obtain the IDF curves. Hyfran-plus software is employed to locate the maximum depths for different return periods. Various values for the time of concentration are studied. It is concluded that the difference between the rational and SCS methods is great for the time of concentration till 2 hours, then it decreases obviously from 2 till 6 hours. Also, it is concluded that the difference between the two methods is bigger for the small return periods of 2 and 5 years for all values of the time of concentration. Employing the obtained equations, the peak runoff for one of the two methods (the rational and SCS methods) can be calculated knowing the time of concentration and the peak runoff for the second method.  

scholarly journals COMPONENTS OF NON REVENUE WATER; ITS MANAGEMENT AS A TOOL FOR SUSTAINABLE WATER RESOURCES; A CASE STUDY OF DOKA DISTRICT, KADUNA NORTH LGA

2021 ◽  
Vol 2 (1) ◽  
pp. 42-56
Author(s):  
Ajoge N. ◽  
◽  
Muhammad N. ◽  
Ugwu J. ◽  
Zayyanu S. ◽  
...  
Keyword(s):  
Water Resources ◽  
Distribution System ◽  
Management Strategies ◽  
World Population ◽  
Water Demands ◽  
Severe Water Stress ◽  
Reduction Strategies ◽  
Non Revenue Water ◽  
The Difference

Non-revenue water (NRW) is the difference between net water inputs in the distribution system and billed authorized consumption. Water resources are under stress due to growing population and climate change making a shift towards the implementation of non-revenue water reduction strategies in most countries worldwide (Kanakoudis and Muhammetoglu, 2014). It is expected that by 2030, 47 % of the world population will live in regions with severe water stress (González-gómez, García-rubio and Guardiola, 2015). The increase in water demand coupled with Non-Revenue Water (NRW) is causing a challenge in meeting water demands for all competing uses of water; hence the need to assess the management of non-revenue water in Doka district of Kaduna North LGA. In assessing the existing situation and the management strategies to minimize non-revenue water in the Doka district questionnaires and Key Informant Interviews (KII) were administered using purposive sampling. Results show that plumbing materials to fix bursts and leakages which contribute highly to NRW are inadequate to the tune of about 70%. There should be a proactive programme of constantly reviewing the basis for estimation of bills for customers who are currently not metered to improve the accuracy of these estimates while efforts should be made to complete the metering of all customers.

scholarly journals Empirical Model for Calculating the Peak Discharge and The Time Delay of Flood of Synthetic Hydrograph Unit in Sumbawa

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
S Soewarno ◽  
Kustaman Kustaman
Keyword(s):  
Empirical Model ◽  
Peak Flow ◽  
Time Lag ◽  
Annual Rainfall ◽  
Rainfall Runoff ◽  
Unit Hydrograph ◽  
Main River ◽  
Stepwise Method ◽  
Synthetic Unit Hydrograph ◽  
Test Result

This research was carried out in Sumbawa island, it aims to determine: 1) the value of Snyder’s CT and CP coefficient of the synthetic unit hydrograph; 2) the empirical model to estimate of CT and CP coefficient; 3) the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph. Based on rainfall – runoff data, Snyder’s T and CP coefficient of the synthetic unit hydrograph can be derived by syntheti means. The empirical model of CT and CP coefficient can be estimated by using the stepwise method of the multiple regression models. Measurable characteristics of watershed, including watershed area (LDP), length of main river (PSU), slope of watershed (KIM), forest area (LHT), sawah area (LSW), tegal area (LTG), grass area (LRUM), and mean annual rainfall (CHJ) are used to estimate these model. The most appropriate model is selected from a statistical test. Result of analysis show that the model can be used to estimate of Snyder’s CT and CP coefficient. These model can be used to make the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph of ungauged watershed in Sumbawa island.

scholarly journals Hydrological Analysis In Selecting Flood Discharge Method In Watershed Of Kelara River

2021 ◽  
Vol 8 (2) ◽  
pp. 141
Author(s):  
Muhammad Rifaldi Mustamin ◽  
Farouk Maricar ◽  
Riswal Karamma
Keyword(s):  
Water Resources ◽  
Discharge Rate ◽  
Observation Point ◽  
Unit Hydrograph ◽  
Design Flood ◽  
Planning Stage ◽  
Flood Discharge ◽  
Synthetic Unit Hydrograph ◽  
S 100 ◽  
Calculation Results

For Engineers involved in planning and construction of water resources building, hydrology becomes very important data. In terms of planning stage in water resources especially waterworks, it is known that design flood discharge closed to field realistic conditions is often needed in order that a planned construction is able to control flood discharge. Several previous researches in choosing flood discharge selection method have diverse depending on observed watershed. One method in determining selected flood discharge by verification using Creager diagram, by comparing discharge calculation results of several Synthetic Unit Hydrograph (SUH) with infrastructure flood discharge (AWLR result) in observation point. This research aims to obtain  the most suitable synthetic unit hydrograph and close to analysis result of measured discharge frequency, and Creager diagram in Kelara watershed (DAS). Based on the calculation of design flood discharge according to rainfall data using synthetic unit hydrograph of Nakayasu, ITB I, ITB II, and SCS (HEC-HMS) as well as the calculation of design flood discharge according to collected data, it is concluded that the synthetic unit hydrograph method closest to design flood discharge with measured discharge rate and Q1000 rate of Creager diagram is SCS. Flood discharge rate obtained according to HSS SCS method using HEC-HMS  4.8 application in period of 2 years  is 658,40 m3/s, 25 years is 682,70 m3/s, 50 years is 787,00 m3/s, 100 years is 885,70 m3/det, and 1000 years is 1202,60 m3/s

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