Flume study on driftwood jam and flood damage to house around a bridge

It is now commonly accepted that the management of flood risks has to be fulfilled within an integrated framework. About two decades ago flood risk was managed from a limited perspective predominantly by means of structural measures aimed at flood control. In contrast integrated flood risk management incorporates the complete management cycle consisting of the phases prevention, protection and preparedness. In theory it is a well described concept. In the stage of implementation, however, there is often a lack of support although a consistent policy framework exists. Consequently, the degree of implementation must be rated as inadequate in many cases. In particular this refers to the elements which focus on preparedness and prevention. The study to which this paper refers emphasises the means and potentials of scenario technique to foster the implementation of potentially appropriate measures and new societal arrangements when applied in the framework of integrated flood risk management. A literature review is carried out to reveal the state-of-the-art and the specific problem framework within which scenario technique is generally being applied. Subsequently, it is demonstrated that scenario technique is transferable to a policy making process in flood risk management that is integrated, sustainable and interactive. The study concludes with a recommendation for three applications in which the implementation of measures of flood damage prevention and preparedness is supported by scenario technique.

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A novel expert opinion-based approach to compute estimations of flood damage to property in dense urban environments. Barcelona case study

Journal of Hydrology ◽

10.1016/j.jhydrol.2021.126244 ◽

2021 ◽

Vol 598 ◽

pp. 126244

Author(s):

Eduardo Martínez-Gomariz ◽

Edwar Forero-Ortiz ◽

Beniamino Russo ◽

Luca Locatelli ◽

Maria Guerrero-Hidalga ◽

...

Keyword(s):

Expert Opinion ◽

Flood Damage ◽

Urban Environments

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Multi-Objective Model-Based Assessment of Green-Grey Infrastructures for Urban Flood Mitigation

Hydrology ◽

10.3390/hydrology8030110 ◽

2021 ◽

Vol 8 (3) ◽

pp. 110

Author(s):

Carlos Martínez ◽

Zoran Vojinovic ◽

Arlex Sanchez

Keyword(s):

Green Infrastructure ◽

Overland Flow ◽

Flood Damage ◽

Optimal Number ◽

Rainfall Runoff ◽

Urban Catchment ◽

Model Based ◽

Model Domain ◽

Infiltration Processes ◽

2D Model

This paper presents the performance quantification of different green-grey infrastructures, including rainfall-runoff and infiltration processes, on the overland flow and its connection with a sewer system. The present study suggests three main components to form the structure of the proposed model-based assessment. The first two components provide the optimal number of green infrastructure (GI) practices allocated in an urban catchment and optimal grey infrastructures, such as pipe and storage tank sizing. The third component evaluates selected combined green-grey infrastructures based on rainfall-runoff and infiltration computation in a 2D model domain. This framework was applied in an urban catchment in Dhaka City (Bangladesh) where different green-grey infrastructures were evaluated in relation to flood damage and investment costs. These practices implemented separately have an impact on the reduction of damage and investment costs. However, their combination has been shown to be the best action to follow. Finally, it was proved that including rainfall-runoff and infiltration processes, along with the representation of GI within a 2D model domain, enhances the analysis of the optimal combination of infrastructures, which in turn allows the drainage system to be assessed holistically.

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Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability

Water ◽

10.3390/w13070896 ◽

2021 ◽

Vol 13 (7) ◽

pp. 896

Author(s):

Thanh Thu Nguyen ◽

Makoto Nakatsugawa ◽

Tomohito J. Yamada ◽

Tsuyoshi Hoshino

Keyword(s):

River Basin ◽

Extreme Rainfall ◽

Flood Damage ◽

Water Levels ◽

Flood Inundation ◽

Inundation Area ◽

Inundation Depth ◽

Study Results ◽

Inundation Duration ◽

Short Time

This study aims to evaluate the change in flood inundation in the Chitose River basin (CRB), a tributary of the Ishikari River, considering the extreme rainfall impacts and topographic vulnerability. The changing impacts were assessed using a large-ensemble rainfall dataset with a high resolution of 5 km (d4PDF) as input data for the rainfall–runoff–inundation (RRI) model. Additionally, the prediction of time differences between the peak discharge in the Chitose River and peak water levels at the confluence point intersecting the Ishikari River were improved compared to the previous study. Results indicate that due to climatic changes, extreme river floods are expected to increase by 21–24% in the Ishikari River basin (IRB), while flood inundation is expected to be severe and higher in the CRB, with increases of 24.5, 46.5, and 13.8% for the inundation area, inundation volume, and peak inundation depth, respectively. Flood inundation is likely to occur in the CRB downstream area with a frequency of 90–100%. Additionally, the inundation duration is expected to increase by 5–10 h here. Moreover, the short time difference (0–10 h) is predicted to increase significantly in the CRB. This study provides useful information for policymakers to mitigate flood damage in vulnerable areas.

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