Flooding is one of the most striking water induced disaster. This study aims to find out the extent of floodplain for flood discharge of different return periods using one dimensional hydraulic model HEC-RAS, ArcView GIS and Hec-GeoRAS.The study focuses on case study of Lothar Khola.Triangulated Irregular Network was prepared from contour and spot elevations in ArcView GIS.In HEC-RAS, boundary conditions, flood discharges for different return periods were inputted. Steady flow analysis was done for the results. Approach developed by Gilard (1996) was used for flood risk assessment. Area inundated by 2, 10, 50, 100 and 200 years return period flood was 230, 239, 246, 249 and 252 ha., respectively. The classification of flood depth area shows most of the flooding area has water depth greater than 3m. The assessment of the flood area shows that large percentage (> 40 %) of vulnerable area lies on sand area followed by forest, cultivation area, etc. Flooding of cultivation land indicates potential damage in food production and negative effects on the livelihoods of local people. Thus, the study may help in planning and management for future probable disaster through technical approach.
This book presents peer-reviewed articles from the 1st International Conference on Dam Safety Management and Engineering (ICDSME 2019), organized by the Malaysian National Committee on Large Dams (MYCOLD), Tenaga Nasional Berhad (TNB), Department of Irrigation and Drainage (DID) and Universiti Tenaga Nasional (UNITEN). With the theme “resilient dams for resilient communities,” the conference highlighted the latest developments in the area and provided a platform for researchers and professionals to exchange ideas and to address dam safety and engineering issues with the environment in mind. The topics covered included, but was not limited to, best practices in dam safety, reservoir management, dam health monitoring, risk assessment, emergency management and sustainable dams.
This volume is the first in a new series to cover different aspects related to Safety and Security Engineering in order to reach a comprehensive view on risk mitigation.The volume is devoted to floods, as one-third of the annual natural disasters and economic losses, and more than half of the respective victims are flood-related. A burgeoning global population and growing wealth, particularly in the last two or three decades, have increased the risk and the demand for protection from flooding. These features, together with climate change predictions and urban development, are affecting the way flood risk is managed.Knowledge and scientific tools play a role of paramount importance in the strain of coping with flooding problems, along with the capacity building in the context of political and administrative framework. Therefore, governments need to establish clear institutional, financial and social mechanisms and processes for flood risk management in order to ensure the safety of people and property and, thereby, contribute to both flood defence and sustainable development.The present volume contains selected papers presented at the Conferences organized by the Wessex Institute of Technology. The papers have been revised by the Authors, in order to be up-to-date and integrated in the book, which covers the following topics: - Risk assessment - Mathematical models for flood propagation - Effect of topographic data resolution - Social and psychological aspects - Decision making and management - Legislations and directives - Alternatives in flood protection - Response and recovery - Damages and economic-related problems - Case studies The quality of the material makes the volume a most valuable and up-to-date tool for professionals, scientists, and managers to appreciate the state-of-the-art in this important field of knowledge.
This volume provides an introduction for flood risk management practitioners, up-to-date methods for analysis of uncertainty and its use in risk-based decision making. It addresses decision making for both short-term (real-time forecasting) and long-term (flood risk planning under change) situations. It aims primarily at technical practitioners involved in flood risk analysis and flood warning, including hydrologists, engineers, flood modelers, risk analysts and those involved in the design and operation of flood warning systems. Many experienced practitioners are now expected to modify their way of working to fit into the new philosophy of flood risk management. This volume helps them to undertake that task with appropriate attention to the surrounding uncertainties. The book will also interest and benefit researchers and graduate students hoping to improve their knowledge of modern uncertainty analysis. Contents:Introduction:Flood Risk Management: Decision Making Under Uncertainty (Jim W Hall)Use of Models in Flood Risk Management (Keith Beven)Theoretical Perspectives:A Framework for Uncertainty Analysis (Keith Beven)Classical Approaches for Statistical Inference in Model Calibration with Uncertainty (R E Chandler)Formal Bayes Methods for Model Calibration with Uncertainty (Jonathan Rougier)The GLUE Methodology for Model Calibration with Uncertainty (Keith Beven)Uncertainties in Flood Modelling and Risk Analysis:Uncertainty in Rainfall Inputs (R E Chandler, V S Isham, P J Northrop, H S Wheater, C J Onof and N A Leith)Uncertainty in Flood Frequency Analysis (Thomas R Kjeldsen, Rob Lamb and Sarka D Blazkova)Minimising Uncertainty in Statistical Analysis of Extreme Values (C Keef)Uncertainty in Flood Inundation Modelling (Paul D Bates, Florian Pappenberger and Renata J Romanowicz)Flood Defence Reliability Analysis (Pieter van Gelder and Han Vrijling)Uncertainties in Flood Modelling in Urban Areas (Slobodan Djordjević, Zoran Vojinović, Richard Dawson and Dragan A Savić)The Many Uncertainties in Flood Loss Assessments (John Chatterton, Edmund Penning-Rowsell and Sally Priest)Uncertainty and Sensitivity Analysis of Current and Future Flood Risk in the Thames Estuary (Jim W Hall, Hamish Harvey and Owen Tarrant)Uncertainties in Real-Time Flood Forecasting:Operational Hydrologic Ensemble Forecasting (Albrecht H Weerts, Dong-Jun Seo, Micha Werner and John Schaake)A Data-Based Mechanistic Modelling Approach to Real-Time Flood Forecasting (Peter C Young, Renata J Romanowicz and Keith Beven)Uncertainty Estimation in Fluvial Flood Forecasting Applications (Kevin Sene, Albrecht H Weerts, Keith Beven, Robert J Moore, Chris Whitlow, Stefan Laeger and Richard Cross)Case Study: Decision Making for Flood Forecasting in the US National Weather Service (Robert Hartman and John Schaake)Quantifying and Reducing Uncertainties in Operational Forecasting: Examples from the Delft FEWS Forecasting System (Micha Werner, Paolo Reggiani and Albrecht H Weerts)Real-Time Coastal Flood Forecasting (Kevin Horsburgh and Jonathan Flowerdew)Uncertainties in Long-Term Change in Flood Risk:Detecting Long-Term Change in Flood Risk (Cíntia B Uvo and Robin T Clarke)Detecting Changes in Winter Precipitation Extremes and Fluvial Flood Risk (Robert L Wilby, Hayley J Fowler and Bill Donovan)Flood Risk in Eastern Australia — Climate Variability and Change (Stewart W Franks)Communicating Uncertainties:Translating Uncertainty in Flood Risk Science (Hazel Faulkner, Meghan Alexander and David Leedal) Readership: Hydrologists, civil engineers, meteorologists, flood risk managers, environmental scientists, hydraulic engineers and consultants. Key Features:Dedicated to the important problem of uncertainty in flood risk analysisTakes an applied perspective with a range of case studiesProvides a comprehensive coverage of uncertainties in flood risk analysis, including flood forecasting, simulation modeling and impacts assessmentKeywords:Floods;Flood Risk Management;Uncertainty Estimation;Flood Frequency;Rainfall Models
Floods are of increasing public concern world-wide due to increasing damages and unacceptably high numbers of injuries. Previous approaches of flood protection led to limited success especially during recent extreme events. Therefore, an integrated flood risk management is required which takes into consideration both the hydrometeorogical and the societal processes. Moreover, real effects of risk mitigation measures have to be critically assessed. The book draws a comprehensive picture of all these aspects and their interrelations. It furthermore provides a lot of detail on earth observation, flood hazard modelling, climate change, flood forecasting, modelling vulnerability, mitigation measures and the various dimensions of management strategies. In addition to local and regional results of science, engineering and social science investigations on modelling and management, transboundary co-operation of large river catchments are of interest. Based on this, the book is a valuable source of the state of the art in flood risk management but also covers future demands for research and practice in terms of flood issues.
This book reviews the state of the art of natural disasters like floods and landslides, highlighting the possibility of safe and correct land planning and management by means of a global approach to territory. In fact, the events deriving from slope dynamics (gravitational phenomena) and fluvial dynamics (floods) are commonly triggered by the same factor (heavy rainfall), occur at the same time and are closely related. For this reason, this book analyses floods and slope stability phenomena as different aspects of the same dynamic system: the drainage basin.
Reducing flood damage is a complex task that requires multidisciplinary understanding of the earth sciences and civil engineering. In addressing this task the U.S. Army Corps of Engineers employs its expertise in hydrology, hydraulics, and geotechnical and structural engineering. Dams, levees, and other river-training works must be sized to local conditions; geotechnical theories and applications help ensure that structures will safely withstand potential hydraulic and seismic forces; and economic considerations must be balanced to ensure that reductions in flood damages are proportionate with project costs and associated impacts on social, economic, and environmental values. A new National Research Council report, Risk Analysis and Uncertainty in Flood Damage Reduction Studies, reviews the Corps of Engineers' risk-based techniques in its flood damage reduction studies and makes recommendations for improving these techniques. Areas in which the Corps has made good progress are noted, and several steps that could improve the Corps' risk-based techniques in engineering and economics applications for flood damage reduction are identified. The report also includes recommendations for improving the federal levee certification program, for broadening the scope of flood damage reduction planning, and for improving communication of risk-based concepts.
Presenting a forward look at the way risks associated with flooding and coastal erosion are likely to increase during the 21st century, this title examines the integrated measures necessary to manage future increases in risk.
HECGeoRAS interface in co-ordination with ArcView3.3 was applied. The results of flood frequency analyzed by WECS/DHM method showed instantaneous discharges of 84,141,185, 232, 298, 352 and 411m3/s for 2, 5, 10, 20, 50,100 and 200-years return period floods. Flood depth area showed that the Basti was submerged at water depth greater than 2m. Risk was evaluated by connecting societal attributes of Basti to flooding events. Societal attributes included general poverty analysis, environment and health, flood hazard, institutional involvement etc. As the Basti was unmanaged and populated with 34 percent child and old age group, no warning system adapted, frequent flood experiences, less cultural flood adapted, relatively poor people, lower environmental condition and at last but not the least that Basti located at flood plain, the flood hazard risk levels were considered to be consequently high. As 58.4 percent population of Basti are poor and barely living at a sustenance level, a flood disaster could be completely devastating for them. A landless, illiterate, poor (family) with no savings and no other means of income and shelter if hit by a flood, faces a much deplorable situation.
In some important respects floodplain management and flood hazard research is different in Britain from that in other countries. This collection of papers from a conference provides some comparisons. It covers urban flooding, institutions and policy, land use policy, hazard response, and project appraisal and risk assessment.