Rainwater storage tank as a remedy for a local urban flood control

2008 ◽  
Vol 8 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Youngjin Kim ◽  
Mooyoung Han
Keyword(s):  
Flood Control ◽  
Peak Flow ◽  
Flow Curves ◽  
Urban Flood ◽  
Runoff Analysis ◽  
Tank Capacity ◽  
Versus Peak ◽  
Flood Condition ◽  
Rainwater Tanks

Surcharge runoff over the capacity of drainage pipes is one of main flood breaking factors in urban area. Change into larger pipes is costly and time consuming solution. Rainwater tanks can be a sustainable solution for the control of heavy runoff. The Rainfall-Storage-Drain(RSD) model is developed for the design of rainwater tanks of flood control. Design rainfall of Huff's distribution and runoff analysis on building rooftop makes inflow curves into the tanks. Through a water balance equation, tank volume versus peak flow curves can determine the minimum tank volume needed for controlled peak flow value of a design period. The case study in Seoul City shows a tank of 29 L/m2 can control the runoff of 30-years with the drainage pipes of 10-years design period. The RSD model can give simple and easy curves to understand for tank capacity determination in a local flood condition.

Fuzzy Variable Assessment of Urban Flood Control System Safety in Jinan

2010 ◽  
Vol 159 ◽  
pp. 279-284
Author(s):  
Xing Ju Wang ◽  
Yu Wei Hao ◽  
Yue Lu
Keyword(s):  
Control System ◽  
Flood Control ◽  
Fuzzy Variable ◽  
Assessment Model ◽  
System Safety ◽  
Urban Flood ◽  
The Sustainable Development ◽  
The Stability ◽  
Variable Fuzzy Sets

Urban flood control system is a collection of various preventive measures taken to resist and mitigate flood. Assessment of urban flood control system safety is one of the important measures to coordinate the urban social planning and the urban flood control facilities.The assessment can also promote the sustainable development of city.In allusion to urban flood control system safety is a fuzzy concept with vague denotation, a fuzzy variable assessment model of urban flood control system safety is constructed in this paper based on theories of variable fuzzy sets and relative different functions.The method can determine relative membership degrees and functions of various indexes associated with the urban flood control system safety scientifically and reasonably; through changing the model,the stability of grade eigenvalues is tested; the mean of grade eigenvalues is calculated to improve the reliability of assessment results. The synthetical assessment of flood control system safety can be implemented with the method adopted in this paper.By 4 safety grades, 9 key indexes were screened in the urban flood control system of Jinan to implement the safety assessment in this paper. The case study of Jinan shows that the proposed method is of practical use.

scholarly journals A Method for Dynamical Sub-Watershed Delimitating by No-Fill Digital Elevation Model and Defined Precipitation: A Case Study of Wuhan, China

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 486
Author(s):  
Hongping Zhang ◽  
Xinwen Cheng ◽  
Lei Jin ◽  
Dong Zhao ◽  
Tianjing Feng ◽  
...  
Keyword(s):  
Water Level ◽  
Digital Elevation Model ◽  
Flood Control ◽  
Return Periods ◽  
Wuhan City ◽  
Urban Flood ◽  
Digital Elevation ◽  
Elevation Model ◽  
Control Management

Watershed delimitation is very important in flood control management. The traditional sub-watersheds delimitated by a filling digital elevation model (DEM) may change the real sink area, such that it may not be the best choice in studies sensitive to sub-watershed storage. This paper proposes a dynamical watershed delimitation method using a no-fill DEM and precipitation. It considers a closed sink area containing cells that fully flow into a large special cell, which can flow out when its water level is “higher than outlet”. We took Wuhan City as a study area and defined the precipitation in return periods of 1, 5, 20, or 100 years to derive the sub-watersheds. It is found that, in the four delimitations, the ratio of isolated basic units which could not flow outside were 27%, 9%, 5%, and 1%, respectively, as the precipitation increased. The results show that the provided method satisfies the assumption that the sink area might overflow with increased precipitation. The sub-watershed delimitated by the proposed method has higher correlation with the distribution of waterlogging points than those delimitated according to the D8 algorithm. These findings indicate that the proposed method can derive reasonable sub-watershed delimitation and that it may be helpful in the practice of urban flood control management.

scholarly journals Evaluation of Urban Flood Control Project –Case Study at Bendung Watershed in Palembang City, Indonesia–

2021 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Rian Dinata
Keyword(s):  
Flood Control ◽  
River Flow ◽  
Small Rivers ◽  
Urban Flood ◽  
Main River ◽  
Flood Damages ◽  
Cost And Benefit Analysis ◽  
The Cost ◽  
The City

Abstract:  Palembang City locates on a lowland where the altitude is between 12 and 30m above sea level. There are many small rivers that flow into a main river, Musi river. Due to the topographical configuration and a seasonal heavy rainfall, those rivers had been overflowed and the city had an inundation disaster. Bendung watershed is one of the nineteen watersheds in Palembang City, and the watershed also experiences the inundation disaster frequently due to the flood caused by a poor river maintenance and drainage system.The local government of Palembang City has applied some flood control projects such as a normalization project to reduce the flood damages. These measures checked the river flow over the dike, but some areas still suffered from the flood damages due to their topography. Based on the current situation, this study evaluates the efficiency of the existing normalization project in this watershed to find a solution that reduces the flood in those areas. Furthermore, this study investigates the feasibility of infiltration-well system to overcome the flood in those areas. The feasibility study includes the cost and benefit analysis to realize the infiltration-well system for easing the inundation problem.Abstrak: Kota Palembang terletak di dataran rendah dengan ketinggian antara 12 sampai 30m di atas permukaan laut. Karena konfigurasi topografi dan curah hujan musiman yang tinggi, sebagian Kota Palembang sangat rentan terhadap genangan dan bencana banjir . DAS Bendung merupakan salah satu dari sembilan belas DAS yang ada di Kota Palembang, dan DAS tersebut juga sering mengalami bencana genangan akibat banjir yang disebabkan oleh sistem drainase yang buruk.Pemerintah Daerah Kota Palembang telah menerapkan beberapa proyek pengendalian banjir seperti proyek normalisasi sungai. Proyek ini cukup sukses mencegah air sungai bendung meluap melewati tanggul sungai tersebut, tetapi beberapa lokasi yang jauh dari sungai bendung masih mengalami genangan karena topografinya. Berdasarkan kondisi ini, studi ini mengevaluasi efisiensi proyek normalisasi di DAS ini untuk mencari solusi yang dapat mengurangi banjir di wilayah tersebut. Selanjutnya studi ini mengkaji kelayakan sistem sumur resapan untuk mengatasi banjir di wilayah tersebut. Studi kelayakan lain meliputi analisis biaya dan manfaat sistem sumur resapan untuk mengatasi masalah genangan. 

scholarly journals FLOOD AND TSUNAMI FLOW IN RELATION TO THE LANDFORMS OF COASTAL AND ALLUVIAL LOWLANDS-CASE STUDY IN HAT YAI AND BANDA ACEH PLAINS

2009 ◽  
Vol 12 (9) ◽  
pp. 68-77
Author(s):  
Masatomo UMITSU
Keyword(s):  
Coastal Plain ◽  
Regional Differences ◽  
Flood Control ◽  
Alluvial Fan ◽  
Delta Plain ◽  
Flood Depth ◽  
Inundation Depth ◽  
The Difference ◽  
Flood Condition

Flood control is a very important issue of the environmental management in the alluvial and coastal plains. For the detail management, it is necessary to know the behavior of the flooding on the plains. Micro landforms of these plains are closely related to the flow and inundation depth of floods. Landforms of an alluvial plain are roughly classified into three units. alluvial fan, floodplain and delta. Landforms of these units are further classified into micro landforms as natural levee, flood basin, paleo-river channel, beach ridges and so on. The places on a higher micro landforms are generally flood free places or the places where the flood depth is shallow. On the contrary, flood water concentrate on the place of the lower micro-landforms as flood basin or back swamp and inundation depth is deep in the areas. Coastal areas as coastal plain or delta plain are subjected to the inundation by tidal surge or tsunami. Regional differences of the landforms of the coastal plain are also related to the difference of flood condition in a plain. Hazard map or risk map for the flood disasters should be taken the characteristics of micro landforms into consideration.

scholarly journals The application of environmental governance for sustainable watershed-based management

2021 ◽  
Author(s):  
Seiichi Kagaya ◽  
Tetsuya Wada
Keyword(s):  
Environmental Protection ◽  
River Basin ◽  
Watershed Management ◽  
Water Use ◽  
Flood Control ◽  
Environmental Governance ◽  
Planning Process ◽  
Environment Assessment ◽  
Control Water

AbstractIn recent years, it has become popular for some of countries and regions to adapt the system of governance to varied and complex issues concerned with regional development and the environment. Watershed management is possibly the best example of this. It involves flood control, water use management and river environment simultaneously. Therefore, comprehensive watershed-based management should be aimed at balancing those aims. The objectives of this study are to introduce the notion of environmental governance into the planning process, to establish a method for assessing the alternatives and to develop a procedure for determining the most appropriate plan for environmental governance. The planning process here is based on strategic environment assessment (SEA). To verify the hypothetical approach, the middle river basin in the Tokachi River, Japan was selected as a case study. In practice, after workshop discussions, it was found to have the appropriate degree of consensus based on the balance of flood control and environmental protection in the watershed.

Urban flood hazard analysis in present and future climate after statistical downscaling: a case study in Ha Tinh city, Vietnam

2021 ◽  
Vol 18 (4) ◽  
pp. 257-274
Author(s):  
T. T. A. Le ◽  
N. T. Lan-Anh ◽  
V. Daskali ◽  
B. Verbist ◽  
K. C. Vu ◽  
...  
Keyword(s):  
Statistical Downscaling ◽  
Flood Hazard ◽  
Hazard Analysis ◽  
Future Climate ◽  
Urban Flood

Study on Urban Flood Control and Drainage in Beijing

2014 ◽  
Vol 1065-1069 ◽  
pp. 2381-2385
Author(s):  
Sen Guo Zhan ◽  
Bao Hui Men ◽  
Jia Jie Wu ◽  
Zheng Da Duan
Keyword(s):  
Heavy Rainfall ◽  
Flood Control ◽  
The Philippines ◽  
City Government ◽  
Urban Flood ◽  
The City ◽  
New Look

On 21 July 2012, a huge thunderstorm hit Beijing, prompting the city government to act immediately to deal with the emergency. Yet great losses were caused, exposing problems about urban flood control and drainage, and making people take a new look at them. It is not uncommon for a rainfall of such a degree to happen in Asia. Comparatively speaking, however, unlike in Beijing, fewer damages are caused in Taiwan, Japan and the Philippines given the same situation. In this article, therefore, the problems arising after a heavy rainfall and their solutions will be discussed.

A Simple Constitutive Model for Prediction of Single-Peak Flow Curves Under Hot Working Conditions

2016 ◽  
Vol 138 (2) ◽  
Author(s):  
Roxana Baktash ◽  
Hamed Mirzadeh
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Peak Flow ◽  
Rate Sensitivity ◽  
Peak Strain ◽  
Flow Curves ◽  
Hollomon Parameter ◽  
Proposed Model ◽  
Stress Coefficient ◽  
Hollomon Equation

The hot flow stress of a typical stainless steel was modeled by the Hollomon equation, a modified form of the Hollomon equation, and another modified form based on the Fields–Backofen equation. The coupled effect of the deformation temperature and strain rate was also taken into account in the proposed formulae by consideration of the Zener–Hollomon parameter or dependency of the constants on temperature. The modified Fields–Backofen equation was found to be appropriate for prediction of flow stress, in which the incorporation of peak strain and consideration of temperature dependencies of the strain rate sensitivity and the stress coefficient were found to be beneficial. Moreover, the simplicity of the proposed model justifies its applicability for expressing hot flow stress characterizing dynamic recrystallization (DRX).

scholarly journals Numerical Simulation Study of Booming Effect in Fast Currents of Inland River

2018 ◽  
Vol 38 ◽  
pp. 03048
Author(s):  
Rongchang Chen ◽  
Chen Liu ◽  
Xiaofeng Luo ◽  
Wei Shen
Keyword(s):  
Numerical Simulation ◽  
Environmental Conditions ◽  
Yangtze River ◽  
Flood Control ◽  
Peak Flow ◽  
Control Design ◽  
Simulation Method ◽  
Design Flow ◽  
The Yangtze River ◽  
Annual Average

In the downstream tidal section of the Yangtze River, nine kinds of combinations of hydrological environmental conditions are considered, including the annual average runoff flow, the annual average peak flow and the flood control design flow, as well as the three conditions of spring, medium and neap tides. By means of the numerical simulation method, the effective performance parameter values for conventional intercepting boom under different environmental conditions are obtained by simulating 9 kinds of maximum current speed to withstand, Max.CS, respectively. The results show that, in the downstream fast current tidal section of the Yangtze River, for the boom performance index of Max.CS, the relatively extensive applicability value should be 3.0kn under the condition of the annual average runoff flow; 4.0Kn should be selected under the condition of the annual average peak flow; and 4.5Kn should be selected under the flood control design flow. This study can provide technical support for the design, selection and use of booms in downstream waters of the Yangtze River.

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