sewer flooding Articles
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Sewer Flooding: The Next Step
Untitled Document Since privatisation, water and sewerage utilities in the UK have been able to deliver almost year-on-year reductions. This applies to both the risk of properties flooding, and also to the actual incidents. Prior to the summary above – taken from the detailed Ofwat Levels of Service report for 2002/3 – actual sewer flooding has reduced by ...
By WRC Ltd
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Urban flood risk assessment using sewer flooding databases
Sustainable water management is a global challenge for the 21st century. One key aspect remains protection against urban flooding. The main objective is to ensure or maintain an adequate level of service for all inhabitants. However, level of service is still difficult to assess and the high-risk locations difficult to identify. In this article, we propose a methodology, which (i) allows water ...
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Remote automation and analytics for a smart water grid
Objectives identified by OFWAT include the improvement of day-to-day resilience through the reduction of the number of supply interruptions, sewer flooding and pollution incidents, the reduction of water leakage and introduction of performance commitments specifically on improving resilience to drought and flooding. Recommendations include the assessment of a wide range of options including ...
By Rotork plc
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Lambourne & Oakland Court Project - Case Study
Background Waterco engineers required a consultancy-focused company with expert knowledge to work alongside large sewerage companies and water authorities. Storm conditions in Wrexham, twinned with a serious incapacity of the sewer system, resulted in major sewer flooding to a new estate. The local water authority required an upgrade to the sewerage system but in the meantime, Aquobex had to ...
By Aquobex
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Decision making in flood risk based storm sewer network design
It is widely recognised that flood risk needs to be taken into account when designing a storm sewer network. Flood risk is generally a combination of flood consequences and flood probabilities. This paper aims to explore the decision making in flood risk based storm sewer network design. A multi-objective optimization is proposed to find the Pareto front of optimal designs in terms of low ...
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Rapid detection of sewer defects and blockages using acoustic-based instrumentation
Sewer flooding incidents in the UK are being increasingly associated with the presence of blockages. Blockages are difficult to deal with as although there are locations where they are more likely to occur, they do occur intermittently. In order to manage sewer blockage pro-actively sewer managers need to be able to identify the location of blockages promptly. Traditional closed-circuit ...
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The efficiency of asset management strategies to reduce urban flood risk
In this study, three asset management strategies were compared with respect to their efficiency to reduce flood risk. Data from call centres at two municipalities were used to quantify urban flood risks associated with three causes of urban flooding: gully pot blockage, sewer pipe blockage and sewer overloading. The efficiency of three flood reduction strategies was assessed based on their effect ...
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Management of Fats Oil and Grease - FOG
Estimates reveal that FOG reaching the nations drains causes up to 75% of sewer blockages and related floods. The management of this waste stream is being taken increasingly seriously by the authorities, including Environmental Health Officers, The Environment Agency and the Water Companies. Not everyone is aware of their responsibilities with regard to this issue, what should be done about ...
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Green–blue water in the city: quantification of impact of source control versus end-of-pipe solutions on sewer and river floods
Urbanization and climate change trends put strong pressures on urban water systems. Temporal variations in rainfall, runoff and water availability increase, and need to be compensated for by innovative adaptation strategies. One of these is stormwater retention and infiltration in open and/or green spaces in the city (blue–green water integration). This study evaluated the efficiency of ...
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Sewer Alarm Technology to Reduce Flooding Risk
A new pilot project investigating how the in-home and environmental risk and impact of sewer flooding could be reduced through the use of alarm technology has now been successfully completed, in partnership between Yorkshire Water and tech company Technolog. The pilot itself was carried out in Leeds, Bradford, Sheffield and Doncaster, with the project winning the Institute of Water North Region ...
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Prioritising sewerage maintenance using inferred sewer age: a case study for Edinburgh
The reported research project focuses on using a database which contains details of customer contacts and CCTV data for a key Scottish catchment to construct a GIS based sewer condition model. Given the nature of the asset registry, a key research challenge was estimating the age of individual lengths of pipe. Within this context, asset age was inferred using the estimated age of surface ...
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An analysis of the combined consequences of pluvial and fluvial flooding
Intense rainfall in urban areas often generates both pluvial flooding due to the limited capacity of drainage systems, as well as fluvial flooding caused by deluges from river channels. The concurrence of pluvial and fluvial flooding can aggravate their (individual) potential damages. To analyse the impact caused by individual and composite type of flooding, the SIPSON/UIM model, an integrated 1D ...
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Different approaches for modelling of sewer caused urban flooding
The correct prediction of flooding in urban areas is an important challenge to secure the values and fulfil public regulations. Traditional sewer simulations deliver the basic information for a rudimental flood protection, but the interaction between sewer and surface runoff can only be considered by a bi-directional modelling. Therefore detailed information about the relevant structures on the ...
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Different approaches for modelling of sewer caused urban flooding
The correct prediction of flooding in urban areas is an important challenge to secure the values and fulfil public regulations. Traditional sewer simulations deliver the basic information for a rudimental flood protection, but the interaction between sewer and surface runoff can only be considered by a bi-directional modelling. Therefore detailed information about the relevant structures on the ...
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Short-term precipitation extremes in regional climate simulations for Sweden
Climate change is expected to generate higher short-term precipitation intensities, which may have negative consequences in terms of, for example, increased risk of flooding and sewer overflow. In this study, extreme precipitation for durations between 30 min and 1 day in simulations with the RCA3 regional climate model (RCM) for Sweden are analysed. As compared with daily observations in the ...
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Integration of transfer function model and back propagation neural network for forecasting storm sewer flow in Taipei metropolis
Typhoons and storms have often brought heavy rainfalls and induced floods that have frequently caused severe damage and loss of life in Taiwan. Our ability to predict sewer discharge and forecast floods in advance during storm seasons plays an important role in flood warning and flood hazard mitigation. In this paper, we develop an integrated model (TFMBPN) for forecasting sewer discharge that ...
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Lost in calibration: why people still do not calibrate their models, and why they still should – a case study from urban drainage modelling
From a scientific point of view, it is unquestioned that numerical models for technical systems need to be calibrated. However, in sufficiently calibrated models are still used in engineering practice. Case studies in the scientific literature that deal with urban water management are mostly large cities, while little attention is paid to the differing boundary conditions of smaller ...
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Urban stormwater inundation simulation based on SWMM and diffusive overland-flow model
With rapid urbanization, inundation-induced property losses have become more and more severe. Urban inundation modeling is an effective way to reduce these losses. This paper introduces a simplified urban stormwater inundation simulation model based on the United States Environmental Protection Agency Storm Water Management Model (SWMM) and a geographic information system (GIS)-based ...
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A methodology for linking 2D overland flow models with the sewer network model SWMM 5.1 based on dynamic link libraries
Pluvial flooding in urban areas is characterized by a gradually varying inundation process caused by surcharge of the sewer manholes. Therefore urban flood models need to simulate the interaction between the sewer network and the overland flow in order to accurately predict the flood inundation extents. In this work we present a methodology for linking 2D overland flow models with the storm ...
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Analysing urban floods and combined sewer overflows in a changing climate
Climate change is expected to lead to an increased frequency and intensity of extreme precipitation events. For urban drainage, the primary adverse effects are more frequent and severe sewer overloading and flooding in urban areas, and higher discharges through combined sewer overflows (CSO). For assessing the possible effects of climate change, urban drainage models are run with ...
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