Spatio-Temporal Analysis of Areas Vulnerable to Urban Flooding: A Case Study of Lahore, Pakistan

Identification of existing hotspots is one of the principal steps for evolving strategy to mitigate urbanflooding, an emerging problem in mega cities of developing countries. Therefore, this paper aims to provide aframework of assessing the spatio-temporal hotspots of urban flooding incidents in Lahore district, Punjab, Pakistan.For this purpose, a database was created by gathering information of sore points by a governmental body, Water andSanitation Agency (WASA) to execute spatio-temporal analysis of urban flooding through hotspot analysis in spatialanalyst tool box in Arc GIS. Results show that urban flooding occurs in each town of Lahore excluding Wahga town.Among all affected towns of Lahore, Data Gunj Bakhsh town is noted as a highly affected area accounting 27 percentof urban flooding incidents during monsoon period from 2012-2017. Temporal study also shows an overall increasingtrend for incidents of urban flooding during 2012-2017. Moreover, detailed study shows that month of August isnoteworthy for urban flooding which is consistently increasing

Urban Flooding in Kenya From a Psychosocial Perspective

There are legislative and engineering interventions coupled with increased community participation to mitigate urban flooding. However, there is an observed increase in flood events and their impact in these environments globally; and participation by individual home and property owners in community-driven initiatives to mitigate flooding in urban and peri-urban areas is reportedly low. The major objective of this study was to provide an understanding of urban flooding in Kenya from a psycho-social perspective. The specific objectives were: to establish a basis for a study associating the onset of flooding with environmental attitude and behaviour; to set ground for an investigation relating the effect of flooding on households to environmental attitude and behaviour; provide a background for analysis to correlate the level of humanitarian support during flooding with environmental attitude and behaviour; provide a basis for evaluation of possible attitude and behavioural change approaches to enhance urban flood disaster interventions; and to develop a conceptual framework the study of urban flooding in Kenya from an environmental attitude and behavioural perspective. This was a desk-top survey that involved a review of the literature covering urban flooding onset triggers, effects, and interventions; human attitudes and behaviour; environmental abuse, degradation, and conservation; as well as urban populations' livelihood practices. The study concludes that there exist gaps that provide an opportunity for investigation of urban flooding in Kenya from a psycho-social perspective

focusing on the case of Korea's abnormal precipitation in the summer of 2020

Thesis(Master) -- KDI School: Master of Public Management, 2022Climate change and urbanization are accelerating the seriousness of urban flooding. Urban flooding is caused by a combination of urban characteristics, drainage systems, and land-use status. Preventive measures are important in terms of the fact that disasters in urban areas cause enormous human and property damages, and that the cost of restoration exceeds the amount of damage. This paper aims to contribute to improving city’s responsiveness to urban floods by investigating major causes of and suggesting improvement measures to urban flooding. It discusses a framework that highlights the three stages of disaster management (i.e., pre-, during, and post-disaster), including each stage’s main activities required and the importance of feedback systems across the stages. Using this framework, a case of urban flooding that took place in the summer of 2020 in Korea, which was recorded the longest rainy season in the country, was analyzed. Through the analysis, two main problems were identified: First, the capacity of urban flood defense facilities may be fundamentally insufficient due to abnormal precipitation exceeding expectations. Each time a rainfall record is updated, a flexible design standard should be prepared that comprehensively considers the climate, topography, and land-use status rather than unconditionally raising the design standard. Second, the response system to urban floods that occur repeatedly every year is unsatisfactory. Starting with the linkage of information distributed among each institution, the information system should be used as a means, not a purpose.1. Introduction 2. Current status and the causes of urban flooding 3. Research design 4. The case of urban flooding in the summer of 2020 in Korea 5. Proposals for improvement 6. ConclusionmasterpublishedHyo-Sung KI

Urban Flooding in Vancouver, Canada

Flooding can have devastating, long-lasting, and costly consequences, including the loss of life and displacement of communities.  This review report summarizes the background, causes, and management practices of various urban flooding forms and mitigation efforts in Vancouver, British Columbia (BC) which is located on the Western part on the Pacific coast of Canada. The report makes use of existing literature to understand the flooding phenomena in Vancouver. The city is unique from a flood planning or management perspective because the city is vulnerable to every type of major flooding event, including pluvial, fluvial, and coastal flooding. Nevertheless, Vancouver is considered a globally sustainable city. As such, this report reviews various articles and research to determine the background and causes of various forms of floods experienced in Vancouver and the management practices put in place to mitigate flooding in the city. The study identifies measures in place to address every type of flooding event

ESTIMATION OF FLOOD DAMAGE IN URBAN AREAS OF UKRAINE

The estimation of flood spreading in urban areas of Ukraine is carried out. Total increase of flood in urban areas of administrative regions of Ukraine is investigated. It is shown that flooding in Ukraine has already become a major factor in ecological and geological complexity of life safety in industrial and urban areas. The most important regions of the country in which flooding has become a significant factor that directly affects the dangerous change of geological environment are determined. In general this creates an additional threat to the security of the population in these areas and can be a determining factor of environmental degradation in cities and town in most regions of the country. It is concluded that during 1998-2014 the impact of global climate change on activation of urban flooding inUkrainehas been growing in the conditions of lack of defensive ability of hydraulic structures against increased level of precipitation and expanding of flooding areas. Grade of administrative regions of Ukraine on the level of growth of urban flooding is offered. Expected socio-economic losses out from urban flooding in Ukraine are assessed. Some of the greatest values of expected loss have been observed within the most industrialized and populated regions ofUkraine. It is shown that urban flooding inUkrainehas already become an additional factor in shaping the nature of man-made threats to the security of urban population of these areas. The complex of measures for reduction of the negative impact of and damage from urban flooding in the conditions ofUkraineare offered

Urban flooding and waterlogging in the northern part of Kabul City

Urban flooding and waterlogging are the big challenges in urban areas of Afghanistan especially in the northern part of Kabul city. Such flooding during monsoon become common in recent years. Urban flooding occurs due to unsustainable urban expansion, change in catchment topography, and increase impervious surface, poor link between catchment drainage structures. Obstruction of the drainage structures leads to waterlogging so that stormwater overspills and blocks the roads against traffic and businesses. Over a decade, drainage systems had been undesirably upgraded in proportion to population growth, caused an increase in frequency of urban flooding and waterlogging. However, very few studies have been conducted to address this issue. Therefore, the objective of the study was to evaluate pre and post-development land-use changes and delineate flooding prone area, identify the factors causing urban flooding and waterlogging and finally, to identify catchment discharge from the rainfall using HEC-HMS. For this purpose, land-use changes over 45 years of pre and post-war periods (1964-2009) were evaluated using CORONA 1964 imagery with new update 2009 imagery 10x10cm resolution of Kabul city. Climate Hazard Group InfraRed Precipitation with Station (CHIRPS) and the ministry of energy and water (MEW) rainfall data set were used to estimate discharge from rainfall. The land-use changes scenarios were analysed by using geographical information system (GIS) under the causes of the increase of urban flooding. The results revealed that unsustainable development activities in the natural water flow path are the major cause of increasing flood in the study area. There are other factors as a poor link between Wazerabad canal and existing drainage structures, catchment characteristic, undesirable combined drainage structures law enforcement and less attention to maintenance which contribute to urban flooding and waterlogging. The study suggest that the sub-drainage structure should be linked to Wazerabad canal by considering sufficient slop, segregation of sewer system where applicable, public awareness, structural and non-structural approaches for urban flood mitigation , law enforcements, sediment and solid waste trap at each drainage inlet as well as system cleaning and maintenance after each rainfall are recommended

Flood mitigation performance of low impact development technologies under different storms for retrofitting an urbanized area

Low impact development technologies (LIDs) have been reported as alternatives to mitigate urban waterrelated hazards, particularly for urban flooding. However, the effectiveness of LIDs on flood mitigation is still not well understood. This study assessed the mitigation extent of urban flooding by LIDs for retrofitting an urbanized area at a feasible level using a hydrological model. A range of storms with different rainfall durations and amounts from intensity-duration-frequency curves were used to evaluate the hydrological performances of LIDs. The results indicated that LIDs were effective alternatives to mitigate urban flooding in the urbanized area. Surface runoff and peak flow decreased by 18.6e59.2% and 8.0 e71.4%, respectively. However, the flood mitigation performance decreased markedly with the increase of rainfall amount. Although LIDs were less effective in flood mitigation during shorter and heavier storms, the performance was better with the increase of rainfall duration. This research provides an insight into flood reduction capabilities of LIDs under different rainfall characteristics for retrofitting built up areas, which is useful for urban storm management

Chicago Urban Flooding Resilience and Citizen Science

Urban flooding is a socioeconomic and environmental issue caused by a lack of drainage in urban areas. It causes a disturbance to daily life. Through the creation of a literature review and interviewing local residents, our STEP group will work to supply CNT with materials used to create more inclusive citizen science project data. Citizen science utilizes the public to gather and analyze research and data to understand the environmental problems and where they are located. Through this project, we empower communities to use their voices and provide a first-hand experience of the impacts of urban flooding in these communities

Urban flooding and slope stability, Austin, Texas

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