Flooding Problems Research Articles

An Expert Approach to an Assessment of the Needs of Land Consolidation within the Scope of Improving Water Resource Management

The objective of this study is to present the approach to assess needs of land consolidation to prepare rural areas for proper water resource management. The study presented links of water management with land consolidation, which is a new approach in rural development planning in Central Europe. The results of this research are presented in the form of a needs assessment matrix for water retention. The matrix includes the main groups of parameters that are related to water resource management systems and rural development planning, which are classified into three groups: (1) water resources and retention, (2) technical systems and water management measures, and (3) information about land space distribution in rural areas. A verification of the proposed matrix was carried out for two sites that differ in terms of factors influencing the retention size; one is located in southern Poland in Lower Silesia—in the village of Mokrzeszów—and the other is located in Strzelce Wielkie—a village located in Lesser Poland. Both sites were evaluated using different needs assessment methods in terms of retention. The main factors influencing a reduced retention potential are related to the insufficient retention capacity of river channels and valleys and the inadequate maintenance of melioration systems. In Strzelce Wielkie, the land consolidation favours longer catchment response on rainfall, which is an advantage to mitigating drought and flood problems. The developed matrix can be applied for an assessment of the retention potential of rural areas based on the relatively accessible data. The method is universal and can be used in different regions. The approach presents practical tools dedicated to authorities to deciding on land consolidation in regards to water resources management; it aims at resolving agricultural land use conflicts and sustainably using space in order to manage water domains.

Establishing a co-design framework for disaster mitigation agenda in the urban context. A case study: SIBAT Solo

One of the impacts of climate change on the urban environment is the flood cycle which is significantly difficult to predict. Along with using engineering methods, one more effort that can be conducted is to prepare communities for flood catastrophes in order to address the problem of unpredictable floods in urban settings. The correct technique and approach should be employed to involve residents in a disaster mitigation system. The objective of this study is to provide a co-design framework to assist the agenda for reducing flood disasters in urban settings. The co-design technique is being utilized as a participatory strategy to perform the work objectives of the community-based disaster preparedness community in Solo, Indonesia, according to the preliminary study findings reported in this paper. This study employed a case study method of flood disaster mitigation practices by the SIBAT community. Data analysis administered the interactive model through three stages: data reduction, data display, and conclusion drawing. Preliminary results obtained indicate that the local social and cultural context is essential in developing a co-design framework. Therefore, these findings will later become the basis for building a co-design framework for implementing the flood disaster mitigation agenda in Solo

Current State of Flooding and Water Quality of Nokoue Lake in Benin (Ouest Africa)

A thorough literature review was conducted in order to discover the previous studies that have been done in relation to the problems of flooding and water pollution of Nokoue lake (Benin, West Africa), to identify the limitations of these previous studies, to draw lessons in order to propose how to overcome them. This bibliographic synthesis has shown that previous studies related to the flooding issue have focused on the dynamics of understanding the genesis of flooding. These studies range from the oldest conducted in 1979 to the most recent conducted in 2016. The major results of these studies in relation to floods are hydrodynamic techniques allowing to evaluate in a punctual way the hydrological regime of the Nokoue lake. In other words, they are solutions allowing to reconstitute the floods generated by the river waters. It appeared that these results of flood reconstitution are difficult to generalize because of the complexity of the hydrographic network of Nokoue lake. The hydrodynamics of Nokoue lake is influenced differently by its main water tributaries (the Sô River, the Ouémé River, the Porto Novo Lagoon and the Atlantic Ocean). Therefore, a decision-making issue on planning and flood management must be motivated by a decision support tool. It is moreover recommended in these studies the resumption of the process of hydraulic techniques periodically during the period of high water in order to take advantage of the hydrological behavior of Nokoue lake in terms of overflow which are at the origin of the floods. The need for innovative decision-making solutions on flood planning and management in order to reduce disasters is still a priority for decision-makers. These innovative solutions are undoubtedly the flood forecasting. On the water quality of Nokoue lake, the oldest study conducted dates back to 1987 and the most recent one in 2018. In these studies, water quality is evaluated in two seasons: the low water season (December to mid-May) and the high-water season. It was found that the salinity of the lake increased significantly with an average of 16 ppt during the low water period while during the high-water period, freshwater inflows from the tributaries invaded the lake and prevented water from the Atlantic Ocean from entering. The concentrations of inorganic nutrients in the lake increase from low water to high water. However, the quantification to date of nutrient loads from external sources as well as internal sources to the lake have not been quantified. This implies that further research on the water quality of the lake could be conducted. Prevention actions should consider a predictive monitoring of the water quality index of Nokoue lake.

Pemberdayaan Masyarakat Dalam Pengelolaan Sampah Skala Rumah Tangga untuk Mewujudkan Kabupaten Banyuwangi Sehat

Changes in people's behavior in waste management are very important, as a solution to the waste problems that have occurred so far. The purpose of this service is to provide an overview of the education community in managing household-scale waste. This dedication approach uses Participatory Action Research (PAR). The results of the service show that so far the handling of household waste in Alasmalang Village, Singojuruh District, is still being burned and thrown into the river. This can become a public health problem, in addition to the problem of flooding which will threaten at any time. In supporting the Healthy Banyuwangi Regency, it is necessary to educate and assist in separating and sorting waste from households on an ongoing basis.

The Performance of Natural Flood Management at the Large Catchment-Scale: A Case Study in the Warwickshire Stour Valley

The limited understanding of Natural Flood Management (NFM) performance, especially at large hydrological scales, is considered a critical barrier for the further funding and implementation of these nature-based solutions to the increasing international problem of flooding. The publications of the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report and Environment Agency’s National Flood and Coastal Erosion Risk Management Strategy (NFCERMS) for England have shown that extreme weather, including increased likelihood of high magnitude flood events, will occur and will require more novel management methods. This study focused on the ability of co-designed NFM measures to ameliorate downstream fluvial flooding by attenuating catchment response through a highly spatially distributed network of attenuating and roughening measures. Performance was characterised by the ability of NFM to attenuate flood peaks at different spatial scales across a large (187 km2) dendritic catchment, including the lowering of flood peaks and delaying the time-to-peak. Using a coupled modelling methodology and applying it to the upper Stour Valley, Warwickshire-Avon, UK, a rural response to the application of a set of NFM interventions was developed using the hydrodynamic model Flood Modeller Pro and XPSWMM ©. The method demonstrated a means of incorporating local knowledge in a realistic set of NFM schemes, tested to multiple flood risk scenarios (including climate change). Under frequent, smaller design storm events (e.g., Index Flood (QMED) and 3.3% AEP), flood peaks were lowered across all hydrological scales tested (5.8 km2 to 187 km2). As the design flood event severity increases, impact from upstream NFM attenuation on downstream peak response diminished significantly, especially at the largest hydrological scales. However, even at the largest hydrological scale, delays in time-to-peak were noted, increasing the ability of downstream communities to respond and enact flood preparation activities, thus increasing resilience to potential flooding events. While the benefits were limited to large flood events, the modelling indicated that NFM has the potential to reduce downstream flood risk. However, greater integration of observed data to improve model confidence and reduce uncertainty in modelled events is needed, especially the uncertainty associated with using single peaked design storm events from the Flood Estimation Handbook (FEH). This paper proposes a future Before–After Control–Impact (BACI) monitoring programme that could be integrated with models and applied across non-tidally influenced catchments seeking to empirically test the hydrological performance of in-situ NFM.

ANALISIS SALURAN DRAINASE DIJALAN BANTAR KOTA TASIKMALAYA

The number of people who increase every year has resulted in the shift of land use in every place, not least in the city of Tasikmalaya. This change in land use indirectly results in reduced water catchment areas so that when it rains with high intensity it will cause inundation. Inundation in urban areas can be caused by several factors, for example due to a disturbed drainage system. The purpose of this study was to determine the condition of the drainage channel on the Bantar street of Tasikmalaya City and to determine the ideal drainage channel to deal with frequent floods.The method used in this research is direct measurement in the field (observation) by taking existing channel data consisting of the coordinates of each channel for each stationing, field contour data, and channel dimensions. Then the data is processed to determine the condition of the drainage channel that will be used for the analysis of the ideal channel capacity to deal with flood problems at the research location.The results of this study can be concluded that the condition of the existing channels on the outskirts of the city of Tasikmalaya some already exist that are not suitable for use, and must be immediately replaced with a more ideal channel so that the water discharge can flow smoothly and the dimensions of the channel are ideal for maximum water flow. on the Bantar City Tasikmalaya road section, the width (b) = 0.8 height (H) = 0.9 and guard height (W) = 0.6 with a drainage coefficient (C) = 0.70, and land slope (s) =0.02.

Flood Mitigation Approaches: Selected Cases Across Europe, Oceania and Asia

Flood is natural phenomenon that cannot becompletelycontrolled by man. Floodis a global problem. Even urban areas whichhave good development planning and drainage systemsare susceptible to floods. Flooding in urban area is usually associated with poor drainage system maintenance, failure to plan drainage system, area development is not planned properly,and climate change factors. Typically,engineering measuresare meanttoreduce severity of flood problems and theyare quite costly. Goal of this paper is to assess the various mitigation approaches that have beenused to mitigate floodsacross Europe, Oceania and Asia continents. Selected casestudies involvingthe North Sea flood, as well as floods in the Netherlands, Scotland, New Zealand, Australia, Hong Kong, Taiwan, Singapore and Malaysiawere considered.Approaches that were highlighted include construction of dam, breakwater, canal, and pumping system. It has alsobeenfound that flood solution methods by way ofsourcecontrolis not so popular to be fully practiced. Hence, the sustainability of good development isactually a solution to problem of flooding, especially to mitigateflash floods that often occur in an urban areas.

Digital methodology to detect vulnerable areas to flooding in urban zones located in the mountains

The risk of flooding in cities near riverbeds is a latent concern, especially during the rainy season. A specific case is that of Misantla, located in the State of Veracruz-Mexico, where floods have already caused social and economic damages. For flood prevention, this study proposes a digital methodology based on specialized ArcGIS, HEC-RAS and HEC-GeoRAS software, taking as a case study the urban areas located in mountainous areas of Misantla, Veracruz; likewise, hydrodynamic models supported by field studies and the use of geographic information systems (GIS) were used in order to know the vulnerable areas. The simulation shows the probable flood zones and the maximum depth levels that flows can reach in extraordinary rainfall events, which is an important element for risk assessment. By forecasting flooding areas, the spatial resolutions used also have a direct impact on mitigating damages caused by flooding. The study results in a risk map showing the sectors of the population most vulnerable to the problem of flooding and information for the design of protection works. In the city of Misantla, the case of this study, the simulated risk map shows that 57.3% of the surface area of the city of Misantla, particularly the downtown area, is at risk of flooding.

Normalisasi Sungai Cilemer Kabupaten Pandeglang, Banten (Studi Kasus HM 00+00 sampai HM 153+00)

Along with changes in river conditions and population growth, rivers do not function optimally, so as a result of these changes, flooding occurs and causes many losses. Banten Province floods have impacted the community, damaging buildings, rice fields, facilities and infrastructure, and the environment, harming people's livelihoods, especially in the Cilemer River. This study aimed to determine the magnitude of the planned flood discharge for the 100-year return period, the river's capacity with the flood discharge, and the best solution to the Cilemer River's flooding problem. The flood discharge cannot be accommodated by rainfall plans of 177.137 mm, HM 00+00 to HM 153+00, with 94 cross-sectional river segments. According to the hydraulic analysis, the Cilemer River's capacity in the current conditions cannot drain the planned flood discharge, so flood control efforts are required. River normalization and embankment elevation reduced water level by 45.42 percent on average and discharged by 12.46 percent on average.

Sustainable sediment management for sustainable use of reservoirs

Sustainable sediment management for sustainable use of reservoirs

Mitigation of Urban Flooding using Blue-Green Infrastructure: A Case of Dehradun City, India

Increasing frequency and intensity of floods caused lives of 6.7 million people between 1920-2020. Rapid urbanization and climate change are the two leading causes of urban flooding. During the past several years, India has seen an increase in the number of urban flooding catastrophes. The city of Dehradun in Uttarakhand, India situated in a valley in the Himalayan foothills, suffers from the contradictory problems of urban flooding due to increase in the builtup area and water supply gaps. The aim of the study is to mitigate urban flooding through blue-green infrastructure development. The study uses Geographic Information System (GIS) and remote sensing to understand Land Use Land Cover (LULC) change in the period 1995-2020 and to estimate the surface run-off generation of this period using the weighted co-efficient and Soil Conservation Service Curve Number (SCS-CN) methods. The result reveals that with the blue-green infrastructure, rainwater harvesting potential can be increased to 82.03 MLD and groundwater recharge would increase to 2.66 MLD. With this, the rainwaer harvesting potential becomes equivalent to 37% of the water supply for the design period of 2031.

Are sponge cities the solution to China's growing urban flooding problems?

AbstractNature‐based solutions have been promoted as a sustainable solution for urban stormwater management and they are currently adopted at an unprecedented speed and scale to build sponge cities in China, with a primary aim to solving urban flood problems. However, there are limits to how much rainfall sponge cities can absorb, hence, they are unlikely to be a panacea for flooding problems in cities. We argue that bottom‐up community‐based measures are essential part of the intervention development framework that is required to transform sponge cities into flood resilient cities. This community‐based approach can effectively build on the distinctive and unique feature of Chinese cities, that is, the prevalence of gated communities, which provides a solid foundation for implementing community‐based measures for flood management. A range of such community‐based measures including resilience mapping, property‐based resistant and resilient measures, flood insurance, and social resilience building are discussed. Flood resilience building does not just mean investments in gray–green–blue infrastructure, it requires social transformation toward flood resilient communities. This article provides a roadmap for the next stage development of sponge cities which plays a key role in coping with extreme storm events and adapting to climate change in cities.This article is categorized under: Engineering Water > Sustainable Engineering of Water Engineering Water > Planning Water Science of Water > Water Extremes

A practical method for rehabilitation of stormwater collecting system by node flooding detection and regional hydraulic redesign: a case study of eastern Tehran metropolis.

This study investigates the effect of structural modification actions on the existing stormwater collecting system in Eastern Tehran to increase the hydraulic capacity and create suitable conditions for the passage of runoff in the critical points of the canal. First, the hydraulic conditions within the stormwater collecting system were simulated using the Stormwater Management Model (SWMM) model before/after the modification to investigate the rehabilitation results. Three critical locations along the main canal were recognized as the most vulnerable points. Then, based on field visits and brainstorming sessions, rehabilitation methods were presented, and three practical solutions, including canal deepening, canal widening, and their combination, were investigated for each. Then, local investigating based on the rehabilitation alternatives for each critical location was conducted using the HEC-RAS. Finally, the SWMM model was used again to evaluate the overall operational performance of the stormwater collecting system after the rehabilitation. The results revealed that it is necessary to implement two alternatives of deepening and widening to provide adequate transmission runoff capacity during rainfalls with various return periods. More specifically, the localized redesign of the eastern flood diversion canal had an acceptable improvement in reducing flooding problems so that for floods with a return period of 10 years, the number of node flooding dropped from 4 to 0, inundated areas from 17% to 0, and the overflow volume from (10-45) to 0. Moreover, the proposed local rehabilitation reduced the overflow volume from (30-65), (43-74), and (70-92) in the status quo to (4-12), (11-27), and (24-36) for rainfall with 25, 50, and 100-year return periods.

AN ASSESSMENT OF CLIMATE CHANGE AND THE CONSEQUENCES OF MIGRATION IN AFRICA

The issue of climate change has resulted to migration of large number of peoples from various African countries to different places in the world seeking for livelihood. The consequences of this action have blown up continues spread of migrant from Nigeria, Niger Republic, Chad and Cameroon as a victim of environmental related problems or insecurity, if proper care is not taking in the next 20 to 30 years coming the implication and dangers associated with migration can seriously damage the structure of functional Ecosystem operation in the African region and nature of governance conduct in many Africa countries. The paper will use secondary source of data to generate relevant information regarding to the research problem in the area of the study. The paper has two major findings, firstly, in Africa it has been observed that some our culture and human attitudes has some negative consequence to the healthy environment and secondly, most of the government policies in Africa has not address the problems of climate change that led to higher of number of migrations as a result of poverty, desertification, flooding and many other environmental problems.

Integrated approach for low impact development locating in dense residential areas based on sustainable development criteria

The study proposed a practical approach for low impact development (LID) placement in dense residential urban catchments considering social, economic, and technical criteria. The objective is to shift the current technical orientation in LIDs' locating to a practical one with a specific level of residents' cooperation. Four stages were conducted, including (i) acquiring the residents' socio-economic information; (ii) hydraulic simulation of the stormwater collection system in the status quo, (iii) regionalization of the urban catchment using data mining, and (iv) proposing specific LIDs locating scenarios. The field study lasted around four months in a dense residential area with a combination of old/new buildings in the eastern Tehran metropolis. Regionalization was conducted by combining pre-processing/clustering techniques, resulting in six regions (preliminary results) and four regions after the clustering integration in the post-processing study. The regions have different priorities for the LIDs locating, including (i) cooperative cluster, 57 sub-catchments (SCs) and appropriate for rain barrel (RB) and green roof (GR) locating; (ii) semi-cooperative cluster, 12 SCs, appropriate for RB or GR locating; (iii) 15 SCs with infrastructural constraints in the third cluster and appropriate for RB; and (iv) non-cooperative cluster, 34 SCs, inappropriate for LIDs locating. Accordingly, seven locating scenarios were specified, and the developed EPA-SWMM model was modified to evaluate the scenarios for mitigating the study area's node flooding problems. The finding shows that the overflow volume reduced in a range of 36.7-93.1%, 28.3-78.7%, and 16.3-66.4% under the rainfall with 2, 5, and 10 years return periods, respectively.

Participatory and Spatial Analyses of Environmental Justice Communities' Concerns about a Proposed Storm Surge and Flood Protection Seawall.

In response to increasing threats from sea-level rise and storm surge, the City of Charleston, South Carolina, and the US Army Corps of Engineers (USACE) propose constructing a seawall around the Charleston peninsula. The proposed seawall will terminate close to lower wealth, predominantly minority communities. These communities are identified as environmental justice (EJ) communities due to their history of inequitable burdens of industrial and urban pollution and proximity to highways and US Environmental Protection Agency (EPA) designated Superfund sites. The present study documents community concerns and opinions related to the proposed seawall, existing flooding problems, and other issues. The project was guided by knowledge co-production and participant-observation approaches and included interviews with community members, collection of locality-specific data, GIS mapping to visualize key issues, development of an ArcGIS Story Map, and participation in public meetings. Community concerns are reported in the voices of community members and fell into eight major themes: community connections, drainage, impacts of road infrastructure, displacement, increasing vulnerability, sense of exclusion and isolation, mistrust of government, and civic engagement. Community members were significantly engaged in the study and are the owners of the results. As one of the first US East Coast cities pursuing major structural adaptation for flooding, Charleston is likely to become a model for other cities considering waterfront protection measures. We demonstrate the importance of meaningful engagement to ensure that climate adaptation will benefit all, including marginalized communities, and have as few unintended negative consequences as possible. Bringing more people to the table and creating vibrant, long-term partnerships between academic institutions and community-based organizations that include robust links to governmental organizations should be among the first steps in building inclusive, equitable, and climate resilient cities.

AN INNOVATIVE METHOD IN MEASURING PERMEABILITY AND EVAPORATION PARAMETERS IN POROUS PAVEMENTS WITH EMPHASIS ON ITS EFFECTS ON INCREASING URBAN TRANSPORT SAFETY

Today, the increasing development of urbanization and climate change and its resulting issues, including the occurrence of urban floods, is one of the important issues facing city managers. One of these problems that seriously affect lives today is the occurrence of floods and the inundation of urban thoroughfares. Among the problems of floods in urban areas are the disruption of the urban transportation system, reduced transportation safety, inundation of thoroughfares, and consequently, the poor appearance of urban roads. One of the successful strategies in controlling urban runoff is the use of porous pavements in urban thoroughfares. The two capabilities of permeability and evaporation of a porous pavement lead to reduced runoff and a resultant lack of occurrence of inundation of thoroughfares; therefore, accurate measurement of these two parameters is of special importance. This study aims to introduce two devices for measuring the permeability and evaporation of porous asphalt with an innovative method that can measure the permeability and evaporation of asphalt and porous concrete with appropriate accuracy.

The Effect of the “Kampung Bahari” Sustainable Development Program on the Kampong Tambak Lorok Community Semarang

Kampong Tambak Lorok is a place where fishers live on the north coast of Semarang City, facing the problem of tidal flooding and land subsidence. To overcome the issue at Tambak Lorok, the Semarang City Government launched an improvement program with the theme Kampung Bahari. Maritime means life related to the existence of the sea. The program is a medium-term infrastructure improvement. This study aims to determine the effect of infrastructure development through the Kampong Bahari program on the people of Tambak Lorok village. This study used as many as 20 household heads who were selected based on their length of stay in Tambak Lorok Village. The Likert analysis method was used to generate categories and indicators of influence variables based on public perception. Furthermore, the correlation analysis method determines the relationship between infrastructure development results and public perception. The analysis results show that the community strongly supports infrastructure development, especially those relating to the handling of tidal inundation. Communities directly affected by infrastructure development give a higher positive perception value. In addition, infrastructure development has changed the area’s morphology to be more organized and increased opportunities for the community to increase their income and their sustainability.

In the shadow of the dam – Hydrology of the Little Conemaugh river and its South Fork, with insights about past and future flooding

The Little Conemaugh River watershed and its South Fork sub-basin figure prominently in historical flooding of Johnstown, Pennsylvania and nearby communities with catastrophic flooding in 1889, 1936, and 1977 (reviewed herein). Historical stream gage data and data from a new gage on the South Fork (established via a novel, portable cableway system) are used with Nexrad rainfall data to assess watershed response and provide novel analysis of flood hydrology in the Little Conemaugh basin and the sub-basin. Using unit hydrograph estimates for longer duration storms (>8 h) and different baseflow conditions, we probe possible effects of several design storms, including those stemming from a hurricane remnant scenario (Agnes in 1972) and 50-, 100-, and 500-year 12-hour precipitation depths. The unit hydrographs provided peak discharge (Qpeak) estimates for 1977 (the only flood event with available hourly rainfall data) that are in good agreement with empirical peak discharges.Significant channel improvements completed in 1943 were designed to carry the largest known natural flow on record at that time (1936 Qpeak). Preliminary results from design storm scenarios indicate the need for a careful evaluation of extreme discharges and their return periods (including snowmelt-related contributions), as future flood levels in Johnstown may occur more frequently than originally thought. The 1977 flood, which triggered 7 dam failures and eclipsed 1936 Qpeak, resulted from less than 40% the estimated probable maximum precipitation (PMP) for a 12-hour storm. Peak discharges of similar magnitude would have ensued in 1972 had remnants of Hurricane Agnes tracked slightly westward. Flooding and infrastructure problems could be compounded for storms of 24-hour or longer durations, similar to record flooding seen in central Pennsylvania and New York in 1972. Flood recurrence, emergency procedures, and dam safety (particularly, spillway capacity in the Little Conemaugh basin and surrounding region) should likely be reassessed and protective early-warning measures (ineffective in 1977) implemented for the people of Johnstown.

Study on sustainable development and construction of karst mountain city based on the concept of a sponge city.

In recent years, there has been rapid urbanization development in China. The rapid expansion of cities and the increase in the proportion of the area of impervious surfaces have caused urban flooding problems. The karst area in Southwest China is characterized by a sensitive ecosystem, poor self recovery ability and typical karst development. The problems of a fragile and imbalanced water ecology are particularly prominent in karst areas, making it necessary to explore the applicability of the concept of sponge cities in such environments. This study reviews the technical ideas, methods and concepts of sponge cities in China and abroad in recent years. Guiyang, a typical karst mountain city in China, was taken as an example in this study. This was because Guiyang has special hydrogeological characteristics as well as the current urbanization development processes that are affecting the water resources and the environment in the region. It is believed that the construction of mountain sponge cities in karst areas should be mainly through source reduction, process control and end management, combined with intelligent construction methods. Focus should be on strengthening the prevention and control of soil erosion in key areas and risk areas and on properly handling the relationship between urban construction and water resources and ecological environment protection.