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Probabilistic model for the annual number of storm overflow discharges in a stormwater drainage system

URBAN WATER JOURNAL 2017年第6期14卷 604-611页

作者： Szelag, Bartosz Bak, Lukasz Kielce Univ Technol Dept Geotech Geomat & Waste Management Kielce Poland

The paper presents an attempt to develop a probabilistic model for predicting an annual number of storm overflow discharges. Forecasting the occurrence of an overflow discharge event involved the application of the logistic regression, which does not require the development of complex hydrodynamic catchment models. The performed calculations showed that the logistic regression model can be successfully used to evaluate the performance of the emergency overflow weir. The resultant logit model eliminates the necessity to develop hydrodynamic models, to conduct continuous measurements of the flow intensity in the stormwater drainage system and to collect detailed information on the characteristics of the subcatchments within the analyzed catchment. The hydrodynamic model was used to simulate the annual number of discharges. The analysis of the results demonstrated that they are in the range of stochastic values, which indicates an application-related character of the method.

关键词： storm overflow probabilistic model uncertainties

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storm overflows: helping nature and society thrive through the design of innovative wetlands

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PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-CIVIL ENGINEERING 2025年第5期178卷 44-52页

作者： Naismith, David Kendall, Annabelle Ambler, Timothy Barden, Ruth Mott MacDonald Ltd Water Consultancy Div Bristol England Mott MacDonald Ltd Water Consultancy Div London England Wessex Water Serv Ltd Bath England

Reducing storm overflows (SOs) and improving water quality is a core part of the largest infrastructure investment in UK history, as stated in the UK government's storm overflows Discharge Reduction Plan (SORP). To address this, Wessex Water Services Limited (WWSL) is integrating nature-based solutions (NbS) as key interventions into the company's asset base through their commitment to restoring the environment. Building on its successful monitoring programme of reedbed treatment systems installed to treat groundwater-influenced SOs at two sites, WWSL is trialling NbS schemes across the region. Working towards achieving targets set out in the SORP, these trials shall inform the long-term NbS plans of WWSL. Mott MacDonald Limited (MML) has worked closely with WWSL to assess several of their SO sites for installation of constructed treatment wetlands. MML is designing both traditional and innovative wetland approaches to deliver schemes at different scales and approaches, while maximising sustainability through retrofitting existing and decommissioned infrastructure. MML and WWSL are working collaboratively with stakeholders to develop inclusive designs that maximise biodiversity and social opportunities, benefitting the environment and wider communities. Installed systems will be monitored and lessons learnt captured to inform best practice and deliver targets while incorporating wider benefits.

关键词： constructed wetland environment nature-based solutions storm overflow sustainability treatment wetland United Nations Sustainable Development Goals

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Application of Multinomial Logistic Regression to Model the Impact of Rainfall Genesis on the Performance of storm overflows: Case Study

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WATER RESOURCES MANAGEMENT 2022年第10期36卷 3699-3714页

作者： Szelag, Bartosz Suligowski, Roman Majewski, Grzegorz Kowal, Przemyslaw Bralewski, Adrian Bralewska, Karolina Aniol, Ewa Rogula-Kozlowska, Wioletta De Paola, Francesco Kielce Univ Technol 7 Aleja Tysiaclecia Panstwa Polskiego St PL-25314 Kielce Poland Jan Kochanowski Univ Humanities & Sci 7 Uniwersytecka St PL-25406 Kielce Poland Warsaw Univ Life Sci 166 Nowoursynowska St PL-02776 Warsaw Poland Gdansk Univ Technol 11-12 Narutowicza St PL-80233 Gdansk Poland Main Sch Fire Serv 52-54 Slowackiego St PL-01629 Warsaw Poland Univ Naples Federico II Via Claudio 21 I-80125 Naples Italy

In this study, a mathematical model was proposed to analyze the performance of storm overflows. The model included the influence of rainfall genesis on the duration of storm overflow, its volume, and the maximum instantaneous flow. The multinomial logistic regression model, which has not been used so far to model objects located in a stormwater system, was proposed to simulate the duration of storm overflow. The Iman-Conover method, using the theoretical cumulative distributions determined on the basis of 45 - year rainfall sequences, was adopted to simulate the rainfall characteristics describing the overflow performance (total and maximum 30-min rainfall depth and duration). The simulations showed a significant impact of rainfall genesis on the parameters of the storm overflow. The model and the results presented in this study can be used at the stage of dimensioning storm overflows and to create an early warning system against undesirable phenomena in the stormwater system within urban catchments.

关键词： storm overflow Multinomial logistic regression Rainfall genesis Iman-conover method

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Simulation of the number of storm overflows considering changes in precipitation dynamics and the urbanisation of the catchment area: A probabilistic approach

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JOURNAL OF HYDROLOGY 2021年 598卷 126275-126275页

作者： Szelag, Bartosz Suligowski, Roman Drewnowski, Jakub De Paola, Francesco Fernandez-Morales, Francisco J. Bak, Lukasz Kielce Univ Technol Dept Geotech & Water Engn PL-25314 Kielce Poland Jan Kochanowski Univ Dept Environm Res & Geoinformat PL-25406 Kielce Poland Gdansk Univ Technol Dept Environm Engn Ul Narutowicza 11-12 PL-80952 Gdansk Poland Univ Naples Federico II Dept Civil Architectural & Environm Engn Via Claudio 21 I-80125 Naples Italy Univ Castilla La Mancha Chem Engn Dept ITQUIMA Ave Camilo Jose Cela S-N Ciudad Real 13071 Spain

This paper presents a probabilistic methodology that allows the study of the interactions between changes in rainfall dynamics and impervious areas in urban catchment on a long- and short-term basis. The proposed probabilistic model predict future storm overflows while taking into account the dynamics of changes in impervious areas and rainfall. In this model, a logistic regression method was used to simulate overflow resulting from precipitation events based on average rainfall intensity and impervious area. The adopted approach is universal (as it can be used in other urban catchments) and is a significant simplification of classic solutions;a hydrodynamic model is used to analyse the operation of the overflow. For the rainfall simulations, a rainfall generator based on the Monte Carlo method was used. In this method, a modification that allows the simulation of changes taking place in rainfall dynamics, including the effects of climate change, was introduced. This method provides the opportunity to expand and modify probabilistic models in which outflow from the catchment is modelled to predict the functioning of reservoirs and to design sewer networks that have the ability to deal with future rainfall dynamics, including moderate, strong, and violent downpours according to the Sumner scale. To verify the simulation results with a probabilistic model, an innovative concept using a hydrodynamic model was considered. This verification considers the changes in the impervious area in the period covered by the simulations and is limited using standard calculation procedures. In practice, the model presented in this work creates opportunities for defining the concept of sustainable development in urban catchments while taking into account the factors mentioned above. From the perspective of landscaping, this is important because it creates the opportunity to limit the impacts of climate change and area urbanization on the receiving waters.

关键词： Logistic regression storm overflow Probabilistic model Urbanization Rainfall dynamics Sustainability

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3D free surface measurement and numerical modelling of flows in storm overflows

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FLOW MEASUREMENT AND INSTRUMENTATION 2003年第3期14卷 79-87页

作者： Kouyi, GL Vazquez, J Poulet, JB Natl Water & Environm Engn Sch Strasbourg ENGEES Lab SHU F-67067 Strasbourg France Higher Natl Art & Ind Sch Strasbourg ENSAIS Strasbourg France

This article addresses the experimental measurement and validation of 3D numerical modelling of the free surface of a storm overflow of a sanitation system. The authors have prepared a model to develop the measurement instrument. The 3D free surface measurement was achieved by means of the structured light projection technique. In practice, the interpretation of the deformation of a fringe pattern projected on the surface of the moving water provided the height of the water. The calculation chiefly relied on extracting the phase phi(x, y) of the image by performing a Fourier transform of the input signal I(x, y). The work involved the use of reference planes and correcting the deformation of the images generated by the camera. In order to test the suitability of a 3D hydrodynamic computational code for modelling overflows, the experimental results obtained with the model were used as the reference for a comparison with the modelled free surface. The differences in height observed were less than 5 mm. The system has therefore been found to provide reliable data and to validate the use of 3D computational codes. (C) 2003 Elsevier Science Ltd. All rights reserved.

关键词： storm overflow free surface measurement structured light projection 3D numerical modelling

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Trends in sewer overflow management

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WATER-ENGINEERING & MANAGEMENT 2001年第2期148卷 21-+页

作者： Fleming, H Slack, D Water Purification Solutions Severn Trent Services United States

The regulations for combined sewer overflows (CSO) and stormwater overflows (SWO) are becoming more stringent. During wet weather, CSOs are designed to overflow and discharge excess wastewater directly to surface water bodies. A high concentration of pollutants is found in CSO and SWO discharges. Deep bed filtration has been shown to be an effective method for treating CSO and SWO flows. Examples of the application of deep bed filtration to improve discharge quality from CSOs and SWOs are described.

关键词： Filtration Pollution control Sewer network storm overflow

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CSO project to improve water quality in New York's Flushing Bay

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WATER-ENGINEERING & MANAGEMENT 1999年第1期146卷 26-28页

作者： Moutal, HP URS Greiner Paramus NJ USA

Reviews the comprehensive combined sewer overflow (CSO) water quality project underway in New York's Flushing Bay. Mathematical models have been used to define system dynamics. A comprehensive GIS has been integrated with storm water management models. This article presents an overview of the project including a description of storage facilities, pumping stations and vortex facilities.

关键词： Sewer network storm overflow

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A Unit Hydrograph Method for storm overflow Performance Simulation

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Water and Environment Journal 1995年第5期9卷 499-509页

作者： BURROWS, R. MEHMOOD, K. Department of Civil Engineering University of Liverpool United Kingdom

The paper describes a unit hydrograph method, calibrated using the WALLRUS modelling suite, which was employed to simulate the long‐term behaviour of storm overflows in combined sewerage systems. It is shown that this procedure synthesizes overflow operation characteristics to acceptable engineering accuracy, measured relative to WALLRUS predictions. This is achieved at only a small fraction of the computer run‐time, and therefore makes practicable a wide range of overflow performance and river impact studies using local rainfall records of unlimited extent. Copyright © 1995, Wiley Blackwell. All rights reserved

关键词： Flow simulation pollution storm overflow unit hydrographs urban drainage WALLRUS

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CAPTURING AND RELEASING SETTLEABLE SOLIDS - THE SIGNIFICANCE OF DENSE UNDERCURRENTS IN COMBINED SEWER FLOWS

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WATER SCIENCE AND TECHNOLOGY 1995年第7期31卷 85-93页

作者： VERBANCK, MA Université Libre de Bruxelles Traitement des Eaux et Pollution Boulevard du Triomphe CP 208 1050 Bruxelles Belgium

Particulate organic matter concentrations determined at the outlet of a low-sloped combined sewer are observed to increase significantly in the very early stage of storm runoff events. It is found that this is not a result from scouring of actual deposited sediments in the sewer (which are granular), but from the dynamic behaviour of a distinct component of the sewage flow itself. During low flows in dry weather, a part of the coarsest material present in normal sanitary sewage (primarily organic debris such as human and food wastes, of about millimetric size and larger) settles and leaves the main body of the flow, but does not reach the sewer bottom to deposit there. The lowest part of the flowing sewage acts in this case as a temporary storage of highly polluting matter, as its longitudinal velocity is lower than the one of the remaining flow. An explanation for the building of these 'dense undercurrents' is formulated based on a difference between free settling in the main body of flow and hindered settling near the bottom. Although this still merits further confirmation, it is likely that the process which maintains coarse solids in suspension in the undercurrent is a lift force induced by shear in the near-bed zone. The collapse of the undercurrent and the subsequent release of polluting material into the whole water column has been observed in the considered sewer to occur when bed shear stress exceeds about 1.1-1.2 N/m(2). This low value can explain flushing effects occurring frequently during rainy period, or even at peak dry weather flows. On the basis of properties illustrated in this study, a number of management options can be considered for revised day-to-day operation of low-sloped interceptor sewers where dense undercurrents are likely to develop.

关键词： COMBINED SEWER INNER LAYER ORGANIC MATTER SANITARY SEWAGE SETTLEABLE SOLIDS SHEAR STRESS storm overflow SUSPENDED LOAD RESUSPENSION

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CAPTURING AND RELEASING SETTLEABLE SOLIDS - THE SIGNIFICANCE OF DENSE UNDERCURRENTS IN COMBINED SEWER FLOWS

CAPTURING AND RELEASING SETTLEABLE SOLIDS - THE SIGNIFICANCE...

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Specialized International Conference on the Sewer as a Physical, Chemical and Biological Reactor

作者： VERBANCK, MA Universite Libre de Bruxelles Traitement des Eaux et Pollution Boulevard du Triomphe 1050 Bruxelles Belgium

关键词： COMBINED SEWER INNER LAYER ORGANIC MATTER SANITARY SEWAGE SETTLEABLE SOLIDS SHEAR STRESS storm overflow SUSPENDED LOAD RESUSPENSION

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