The effect of flood mitigation spending on flood damage: Accounting for dynamic feedback

Considering that urban areas may suffer more substantial losses than riparian farmlands during floods, diverting floodwater into riparian areas for temporal detention is expected to mitigate flood damage in downstream urban areas. In this study, an assessment has been conducted to evaluate the effect of flood mitigation through riparian detention in response to climate variability in the Tou-Chien Basin of Taiwan. A couple 1D-2D model was used to simulate the flood wave transporting in the main stream and the overbank flow inundating into the urban areas. Based on the numerical simulation results, flooding extent and inundated water depth corresponding to different return periods with current flood prevention infrastructures were detailed investigated. Various riparian detention strategies were proposed to alleviate severe losses in the downstream urban areas of the Tou-Chien Basin.

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Matching Ecosystem Services Supply and Demand through Land Use Optimization: A Study of the Guangdong-Hong Kong-Macao Megacity

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18052324 ◽

2021 ◽

Vol 18 (5) ◽

pp. 2324

Author(s):

Wenjing Wang ◽

Tong Wu ◽

Yuanzheng Li ◽

Hua Zheng ◽

Zhiyun Ouyang

Keyword(s):

Land Use ◽

Hong Kong ◽

Ecosystem Services ◽

Supply And Demand ◽

Flood Damage ◽

Living Environment ◽

Flood Mitigation ◽

Bay Area ◽

Land Use Allocation ◽

Land Use Optimization

Shortfalls and mismatches between the supply and demand of ecosystem services (ES) can be detrimental to human wellbeing. Studies focused on these problems have increased in recent decades, but few have applied land use optimization to reduce such spatial mismatches. This study developed a methodology to identify ES mismatches and then use these mismatches as objectives for land use optimization. The methodology was applied to the Guangdong-Hong Kong-Macao “Greater Bay Area” (GBA), a megacity of over 70 million people and one of the world’s largest urban agglomerations. Considering the demand for a healthy and secure living environment among city-dwellers, we focused on three ES: heat mitigation, flood mitigation, and recreational services. The results showed large spatial heterogeneity in supply and demand for these three ES. However, compared to current conditions in the GBA, our model showed that optimized land use allocation could better match the supply and demand for heat mitigation (number of beneficiaries increased by 15%), flood mitigation (amount of population exposed to flood damage decreased by 37%), and recreation (number of beneficiaries increased by 14%). By integrating land use allocation and spatial mismatch analysis, this methodology provides a feasible way to align ES supply and demand to advance urban and regional sustainability.

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Socio–Economic Analysis of Riverine Flooding on Low-Income Dwellings: Adayar River, a Case Study

Civil and Environmental Engineering Reports ◽

10.2478/ceer-2020-0024 ◽

2020 ◽

Vol 30 (2) ◽

pp. 133-157

Author(s):

Suriya Saravanan ◽

Mudgal Basavaraj ◽

Prakash Nelliyat

Keyword(s):

Low Income ◽

Flood Plain ◽

Flood Damage ◽

Vital Role ◽

Flood Mitigation ◽

Mitigation Measures ◽

Structured Interviews ◽

The Impact ◽

Sustainable Mitigation

AbstractFlood damage assessment plays a vital role in providing information to policy developers. Nowadays, due to urbanization, the impact of flooding on communities is extensive, including tangible damage to property, the environment, and infrastructure as well as intangible damage due to stress, health hazards, and hardship. This paper provides an overview of a detailed flood assessment study conducted in the Kotturpuram Housing board area, located on the flood plain of the Adayar River in Chennai, India. A relatively simple approach to data collection was adopted, being a Questionnaire Survey (QS) as well as semi-structured interviews and observation techniques, due to data and research limitations. Losses due to damage to belongings and extra spending to buy essential commodities during flooding are also dealt with in this study. The flood mitigation costs for flooding that occurred in the year 2015 are also evaluated. A stage-damage curve was arrived at based on the information collected. Optimal and sustainable mitigation measures can be achieved only when the socio-economic aspects are adequately considered. Thus, this analysis was designed to estimate the effects of flooding on a community’s social and economic welfare, and thereby help to educate the community, including residents and officials, about the impact and magnitude of flooding. The outputs of the study will be the key inputs for designing flood mitigation and relief measures.

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Ranking sources of uncertainty in flood damage modelling: a case study on the cost-benefit analysis of a flood mitigation project in the Orb Delta, France

Journal of Flood Risk Management ◽

10.1111/jfr3.12068 ◽

2013 ◽

Vol 8 (2) ◽

pp. 161-176 ◽

Cited By ~ 18

Author(s):

N. Saint-Geours ◽

F. Grelot ◽

J.-S. Bailly ◽

C. Lavergne

Keyword(s):

Cost Benefit Analysis ◽

Cost Benefit ◽

Flood Damage ◽

Flood Mitigation ◽

Benefit Analysis ◽

Sources Of Uncertainty ◽

Damage Modelling ◽

Mitigation Project ◽

The Cost

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Long-term development and effectiveness of private flood mitigation measures: an analysis for the German part of the river Rhine

Natural Hazards and Earth System Science ◽

10.5194/nhess-12-3507-2012 ◽

2012 ◽

Vol 12 (11) ◽

pp. 3507-3518 ◽

Cited By ~ 81

Author(s):

P. Bubeck ◽

W. J. W. Botzen ◽

H. Kreibich ◽

J. C. J. H. Aerts

Keyword(s):

Flood Damage ◽

Flood Risk Management ◽

Flood Mitigation ◽

Mitigation Measures ◽

Flood Events ◽

Private Households ◽

Integrated Flood Risk Management ◽

German Part ◽

Over Time

Abstract. Flood mitigation measures implemented by private households have become an important component of contemporary integrated flood risk management in Germany and many other countries. Despite the growing responsibility of private households to contribute to flood damage reduction by means of private flood mitigation measures, knowledge on the long-term development of such measures, which indicates changes in vulnerability over time, and their effectiveness, is still scarce. To gain further insights into the long-term development, current implementation level and effectiveness of private flood mitigation measures, empirical data from 752 flood-prone households along the German part of the Rhine are presented. It is found that four types of flood mitigation measures developed gradually over time among flood-prone households, with severe floods being important triggers for an accelerated implementation. At present, still a large share of respondents has not implemented a single flood mitigation measure, despite the high exposure of the surveyed households to floods. The records of household's flood damage to contents and structure during two consecutive flood events with similar hazard characteristics in 1993 and 1995 show that an improved preparedness of the population led to substantially reduced damage during the latter event. Regarding the efficiency of contemporary integrated flood risk management, it is concluded that additional policies are required in order to further increase the level of preparedness of the flood-prone population. This especially concerns households in areas that are less frequently affected by flood events.

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