scholarly journals Urban Flood Control in Sringin Catchment, Semarang City, Central Java Province, Indonesia

2018 ◽  
Vol 4 (2) ◽  
pp. 191
Author(s):  
Ngo Pheaktra ◽  
Istiarto Istiarto ◽  
Rachmad Jayadi
Keyword(s):  
Return Period ◽  
Flood Control ◽  
Flow Analysis ◽  
Drainage System ◽  
Urban Flood ◽  
Central Java ◽  
Design Rainfall ◽  
Prone Area ◽  
Lowland Area ◽  
Flood Prone Area

Sringin is the lowland area located in Semarang city which has been vulnerable to rob flooding from the Java Sea along with flood triggered by the intense amount of rainfall. The case study will further discuss the hydrological analysis, transformation of rational method into flow hydrograph with the design rainfall of 25-year return period, and unsteady flow analysis by HEC-RAS 5.0.3 under existing condition and design condition. The result shows that the design rainfall of 25-year return period measures 173 mm in vertical length and data collected from the office of public work, Semarang city can be used to implement the design scenario with normalization of drainage system and the increase of levee with the freeboard up to 0.75 m is proved to be the solution to the flood inundation in that flood-prone area while the flood under existing condition has caused excessive discharge at downstream up to 9 hours.

scholarly journals Evaluation of flood risk as a step in determining the “Acceptable Risk” criteria. Case study: Dengkeng River, Klaten, Central Java

2021 ◽  
Vol 894 (1) ◽  
pp. 012045
Author(s):  
A Sarminingsih ◽  
M Hadiwidodo
Keyword(s):  
Control System ◽  
Return Period ◽  
Flood Risk ◽  
Flood Control ◽  
Public Works ◽  
Acceptable Risk ◽  
Performance Function ◽  
Central Java ◽  
Flood Discharge ◽  
Potential Risks

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.

Research on the Challenges and Solutions of Urban Flood Control System of Nanjing City

2014 ◽  
Vol 641-642 ◽  
pp. 84-87
Author(s):  
Xin Wen ◽  
Guo Hua Fang
Keyword(s):  
Control System ◽  
Flood Control ◽  
Drainage System ◽  
Flood Management ◽  
Urban Flood ◽  
Technology Application ◽  
Management Technology ◽  
Nanjing City ◽  
System Improvement ◽  
Reform And Opening Up

Currently, the development of flood control system of Nanjing City has been entering a new critical phase, facing some great challenging problems that never experienced before. To meet these challenges, this research initially reviewed the developing process of flood control system of Nanjing City after China's reform and opening up. Based on the analysis of current flood control situation, four major challenge of was summarized. To solve these problems, this research provided some productive suggestions for future development of flood control system of Nanjing City from six perspectives, namely principle of flood control, layout of flood control system, drainage system improvement, flood management, technology application and supporting measures.

scholarly journals Towards sustainable community: Effort to reduce flood risk and increase well-being in a densely populated flood-prone area

2021 ◽  
Vol 930 (1) ◽  
pp. 012096
Author(s):  
L Sedyowati ◽  
G Chandrarin ◽  
G I K Nugraha
Keyword(s):  
Community Involvement ◽  
Flood Risk ◽  
Flood Control ◽  
Local Community ◽  
Well Being ◽  
Economic Benefits ◽  
Prone Area ◽  
Community Effort ◽  
Flood Prone Area ◽  
Almost All

Abstract Dealing with flooding in a densely populated flood-prone area poses complex challenges. Almost all residents realize that living in the area is hazardous. However, they choose to stay there. Therefore, flood risk management should be applied in the area. This study aims to: 1) develop facts of the local community in a flood-prone area in decreasing the flood risk while improving well-being through modifying drainage channels used for fish and vegetable farming; 2) evaluate all benefits of drainage investments include the social and economic benefits. The research method consists of a quantitative approach through the distribution of questionnaires and a qualitative approach through in-depth interviews and field surveys. In this study, a concerted community effort was developed as a design parameter. At the same time, the observation parameters include knowledge of the causes of flooding, knowledge of flood risk, community involvement, and government flood control programs. The results showed that the strength of concerted community effort was significantly influenced by the knowledge of flood risk and the local community involvement. This effort can decrease the flood risk by up to 30% and serve direct financial benefits of IDR 48 million in a year.

scholarly journals Efficient pan-European river flood hazard modelling through a combination of statistical and physical models

2017 ◽  
Author(s):  
Dominik Paprotny ◽  
Oswaldo Morales-Nápoles ◽  
Sebastiaan N. Jonkman
Keyword(s):  
Return Period ◽  
Flood Hazard ◽  
Physical Models ◽  
Geographical Information ◽  
Computational Time ◽  
Joint Research ◽  
Simplified Approach ◽  
The Future ◽  
Prone Area ◽  
Flood Prone Area

Abstract. Flood hazard is being analysed with ever-more complex models on national, continental and global scales. In this paper we investigate an alternative, simplified approach, which combines statistical and physical models in order to carry out flood mapping for Europe. Estimates of extreme river discharges made using a Bayesian Network-based model from a previous study are employed instead of rainfall-runoff models. Those data provide flood scenarios for simulation of water flow in European rivers with a catchment area above 100 km2. The simulations are performed using a one-dimensional steady-state hydraulic model and the results are post-processed using geographical information system (GIS) software in order to derive flood zones. This approach is validated by comparison with Joint Research Centre's (JRC) pan-European map and five local flood studies from different countries. Overall, both our and JRC's maps have similar performance in recreating flood zones of local maps. The simplified approach achieved similar level of accuracy, while substantially reducing the computational time. The paper also presents the summarized results from the flood hazard maps, including future projections. We find that relatively small changes in flood hazard are observed (increase of flood zones area by 2–4 %). However, when current flood protection standards are taken into account, there is a sharp increase in flood-prone area in the future (28–38 % for a 1000 year return period). This is because in many parts of Europe river discharge with the same return period is projected to increase in the future, thus making the protection standards insufficient.

scholarly journals Effects of minor drainage networks on flood hazard evaluation

2014 ◽  
Vol 364 ◽  
pp. 192-197 ◽  
Author(s):  
A. Domeneghetti
Keyword(s):  
Preferential Flow ◽  
Flood Hazard ◽  
Numerical Models ◽  
Drainage System ◽  
Hazard Evaluation ◽  
Correct Identification ◽  
Drainage Network ◽  
Drainage Networks ◽  
Prone Area ◽  
Flood Prone Area

Abstract. Scientific literature reports a plethora of numerical tools of different complexity (e.g. 1D, 2D raster-based or full 2D models) for flood hazard and flood risk evaluation. The correct identification of the appropriate model still represents a key aspect in the overall flood hazard process even though the potential of these modelling instruments are increased by the availability of high computational resources and by the amount of high-resolution topographic data provided by recent survey techniques. Given this context the present analysis investigates the effects of minor drainage networks on the estimation of flood hazard in a flood-prone area along the Enza River, close to the village of Sorbolo a Levante (RE, northern Italy). By means of a full 2D hydraulic model (Telemac-2D), the effects of the drainage system is analysed using three unstructured meshes with different degrees of complexity: (1) the minor drainage system allows the possibility to convey water outside the study area (REF); (2) the drainage system is reproduced only in terms of preferential flow-paths (REF-noFlow); (3) the drainage network is completely neglected (REF-noDN). The analysis indicates that the maximum flood extent seems not to be influenced by the mesh schematization, while water depths and the total volume are significantly related to the model schematization. Even if this analysis refers to a specific case study and further investigations are needed, it shows the fundamental role of the drainage network in controlling water depth distribution and the duration of the inundation, which should be accurately reproduced by numerical models.

scholarly journals Study on the Classification of Urban Waterlogging Rainstorms and Rainfall Thresholds in Cities Lacking Actual Data

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3328
Author(s):  
Bingyan Ma ◽  
Zening Wu ◽  
Huiliang Wang ◽  
Yuan Guo
Keyword(s):  
Return Period ◽  
Flood Control ◽  
Rainfall Intensity ◽  
Influencing Factor ◽  
Extreme Rainfall ◽  
Observation Data ◽  
Urban Flood ◽  
Storm Water Management Model ◽  
Different Characteristics

Extreme rainfall is the main influencing factor of urban waterlogging. Different types of rainfall often have different characteristics of waterlogging. In order to establish a more accurate urban flood control system, it is necessary to classify waterlogging rainstorms and divide their thresholds. This study proposes a method for applying web crawlers to identify waterlogging rainfall in cities lacking waterlogging observation data and classifying them using the rainfall intensity–duration curves. By selecting appropriate duration thresholds and return period, waterlogging rainstorms are divided into rainfall intensity waterlogging (IW), rainfall amount of waterlogging (AW), combined waterlogging (CW) and no waterlogging (NW). In the application of Zhengzhou City, China, the urban flood control standard and the rainfall time distribution characteristics are used as the basis for the selection of the return period and duration thresholds, and the storm water management model (SWMM) is constructed to simulate the 4 kinds of rainfall characteristics of waterlogging, which is similar to actual situations. It proves that the method is suitable for the classification and thresholds division of different waterlogging rainfall in cities. The results show that the best duration thresholds in Zhengzhou are 20 min (M20) and 60 min (M60), and the best return period standard is 2 a. The thresholds for the 4 types of waterlogging rainstorm are: M20 ≥ 26.47 mm, M60 ≥ 43.80 mm, CW; M20 ≥ 26.47 mm, M60 < 43.80 mm, IW; M20 < 26.47 mm, M60 ≥ 43.80 mm, AW; M20 < 26.47 mm and M60 < 43.80 mm, No waterlogging.

scholarly journals Influence of rain pattern on flood control in mountain creek areas: a case study of northern Zhejiang

2020 ◽  
Vol 10 (10) ◽  
Author(s):  
Feifeng Cao ◽  
Qiru Tao ◽  
Shaojun Dong ◽  
Xiaolong Li
Keyword(s):  
Water Level ◽  
Flood Control ◽  
River Level ◽  
Large Fluctuations ◽  
Prone Area ◽  
Multi Level ◽  
Flood Prone Area ◽  
The Impact ◽  
Selection Of

Abstract Mountain creek areas are a type of flood-prone area, and the flood control in these areas has not been well understood. This study aims to evaluate the impact of rain patterns on the water level and the establishment of flood control standard in mountain creek areas by conducting a case study. The case study was performed on a typical mountain creek area, called Shiliqu watershed in Hangzhou, China. A MIKE11 model was first established to analyze the required flood control standard through investigating the river level impacted by two rain patterns (the designed rainstorm and the typhoon Fitow). The results show that the designed rainstorm pattern and the typhoon Fitow rain pattern have the single-peak and multi-peak profile, respectively. The peak rainfall value of the designed rainstorm pattern is much higher than that of the typhoon Fitow. However, the large fluctuations under the typhoon Fitow rain pattern causes multi-level overtopping which threats the safety of the flood control. Also, the typhoon Fitow could have a greater influence on the water level of the tributaries of the river than that of the mainstream. The selection of rain pattern on the design of flood control standard in mountain creek areas is discussed.

scholarly journals THE FEASIBILITY STUDY OF ENVIRONMENTALLY FRIENDLY URBAN DRAINAGE SYSTEM MANUFACTURE AND ITS RELEVANCE TO ECOLOGICAL INTELLIGENCE IN FLOOD PRONE AREA IN MANGKUBUMI DISTRICT OF TASIKMALAYA

2018 ◽  
Vol 18 (1) ◽  
pp. 1
Author(s):  
Evi Hanafi
Keyword(s):  
Descriptive Analysis ◽  
Research Result ◽  
Drainage System ◽  
Urban Drainage ◽  
Type Ii ◽  
Project Learning ◽  
Prone Area ◽  
Flood Prone Area ◽  
Intelligence Development ◽  
Technical Terms

The aims of this research are to (1) analyze the type of infiltration well that can be applied in Mangkubumi District of Tasikmalaya, and (2) analyze the relevance of infiltrationwell manufacture with the ecological intelligence development. This research is a descriptive quantitative analytics with the research location of Mangkubumi District. The method of collecting data is secondary gained through literature review. Data analysis has been done through descriptive analysis of physical condition. The research result shows that Mangkubumi District generally fulfills the technical terms of infiltration well manufacture based on SNI 03-2453-2002. The type of infiltration well that can be applied in Mangkubumi District is type II, the infiltration well with adobe and red brick without cement plaster with a hole between them and type A retention pool. The infiltration well manufacture can be applied at school project learning method of geography subject therefore the ecological intelligence of students can grow and develop because they experience it directly.

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