sewer system Articles

  • Protecting Homes from Sewage Backup - Metropolitan Sewer District of Greater Cincinnati’s Water in Basement Prevention Program

    ABSTRACT Many customers of the Metropolitan Sewer District of Greater Cincinnati (MSDGC) have experienced basement backup due to surcharging of the sanitary and combined sewer systems. The surcharging was caused by excessive infiltration and inflow entering the sanitary sewer system and a lack of capacity in the combined sewer system. As part of the Consent Decree that MSDGC signed with the ...

  • Economic analyses for optimizing the construction of separate sewer in a hybrid sewer system

    Metropolitan Taipei located in north Taiwan uses a hybrid sewer system consisting of mostly separate sewer for the populated regions, and partly combined sewer for less populated regions. This study used the concept that Marginal Cost of Control (MCC) equals to Marginal Benefits of Control (MBC) to establish the method for studying the optimal household connection percentage, and the most ...


    By IWA Publishing

  • Sedimentation dynamics in combined sewer systems

    Sediments in combined sewers may negatively affect the performance of sewer systems and significantly promote the formation of hydrogen sulfide. To prevent this, German sewer systems are cleaned regularly but at high costs. In order to optimize the cleaning intervals, this study investigates how deposits build up and change over a defined period under constant conditions. The experiments were ...


    By IWA Publishing

  • City of Montebello Sewer Master Planning Utilizing Innovative GIS Solutions

    City of Montebello wanted to implement a comprehensive sewer master plan. At the same time they wanted to embark on implementing a GIS program. The solution was to combine the two and utilize the power and versatility of GIS as the core technology for performing the sewer master plan. In this paper we will show how the City accomplished its primary objectives which included: Modernizing its ...

  • An agent-based approach for generating virtual sewer systems

    The application of artificial case studies is a well established technique in urban drainage to test measures, approaches or models. However, the preparation of a virtual case study for a sewer system is a tedious task. Several algorithms have been presented in the literature for an automatic generation of virtual sewer systems. Applying the approach of generating virtual cities by means of the ...


    By IWA Publishing

  • Vacuum sewerage systems – a solution for fast growing cities in developing countries?

    Developed more than a century ago, the potential of vacuum sewerage systems remains underexploited. At the same time, the rapid urbanization in Asia brings about major challenges for municipal utilities. In this context, the GIZ (Deutsche Gesellschaft fuer Internationale Zusammenarbeit) project ‘Integrated Resource Management in Asian Cities: the Urban Nexus’ gives technical advice to ...


    By IWA Publishing

  • Global sensitivity analysis of an in-sewer process model for the study of sulfide-induced corrosion of concrete

    The presence of high concentrations of hydrogen sulfide in the sewer system can result in corrosion of the concrete sewer pipes. The formation and fate of hydrogen sulfide in the sewer system is governed by a complex system of biological, chemical and physical processes. Therefore, mechanistic models have been developed to describe the underlying processes. In this work, global sensitivity ...


    By IWA Publishing

  • Different erosion characteristics of sediment deposits in combined and storm sewers

    To investigate the different erosion patterns of sediments in combined and storm sewers, sediments from three separate sewer systems and two combined sewer systems in urban Shanghai were collected for the flushing experiments. These experiments were conducted with different consolidation periods and shear velocities. As the consolidation period increases, dissolved oxygen exhibits a positive ...


    By IWA Publishing

  • Savings through shared risk and time & materials contracts

    When the City of London set out to rehabilitate two substantial problems in the sanitary sewer system, it quickly became apparent that an uncertain scope of work as well as high risk did not lend well to a standard tendered contract process. As this form of contract would have the contractor take on all the risk, the cost of the works would increase substantially. Instead, the City acted as the ...

  • Dropshaft cascades in urban drainage systems

    Dropshaft cascades are typical elements of sewer systems in steep urban catchment basins. The design of a dropshaft cascade, which is generally addressed as an optimization problem, also needs to consider the subsequent effects induced on the flow by the different elements of the cascade. Experimental research has been performed at the hydraulic engineering laboratory of the University of ...


    By IWA Publishing

  • Experimental investigation on the efficiency of a high side weir overflow

    ABSTRACTMost of the overflow structures in Flanders are 'high side weir overflows'. For the design of these structures British guidelines are used. However, the design conditions for sewer systems in the U.K. differ from the Flemish design conditions. In Flanders, pressurised flow is in common use in the pipes of the sewer system. That is why tests have been carried out on a scale model of a ...


    By IWA Publishing

  • Design-Storm Analysis Extrapolated to Estimate Long-Term Performance

    Design storms provide the discrete conditions needed to begin the design of a collection system. These short-duration events facilitate small and quick model runs, but do not demonstrate the long-term performance of the system. To evaluate long-term performance of systems that were tested and designed with design storms, CH2M HILL, in conjunction with other consultants and the Metropolitan Sewer ...

  • The variation of volatile fatty acid compositions in sewer length, and its effect on the process design of biological nutrient removal

    The potential of enhanced biological phosphorus removal (EBPR) in biological nutrient removal (BNR) systems critically depends on the availability and types of volatile fatty acids (VFAs) in sewage. Although the characteristics of VFAs in sewage are strongly related with the biochemical transformations in the sewer system, they have not been studied thoroughly in terms of BNR process design. We ...


    By IWA Publishing

  • CSO Control Facility, City of Hackensack, NJ

    Hackensack is the seat of Bergen County in northeastern New Jersey, occupying 4.6 squaremiles. The population of Hackensack is approximately 43,000. Elevation is from three feet to 120 feet above sea level and from a number of locations one can see the New York City skyline, seven miles to the east. During wet weather conditions the sewer system diverted large volumes of untreated waste water to ...

  • BLOWING SMOKE Facts, Figures, and Other Useful Tips for Effective Sewer Smoke Testing

     ABSTRACT Smoke testing is a common diagnostic tool used to locate sources of inflow and infiltration in a sewer system. Smoke testing has been around for many years, but little information is available to help municipalities understand what to expect during such testing. How do I plan for such a project? What can I expect to find? How do I handle public relations? This paper presents a ...

  • The sewer system, an undervalued place, that we depend on every day

    How Digitizing the Sewer supports Climate Change A good infrastructure, such as our sewer system, is essential for a vital, viable, sustainable and social development of a country’s economy. Not only does it play an important role in sanitation and disease prevention, but the sewer system also plays a crucial role in the sustainability of our planet and the future of our generations . ...


    By KANDO

  • Searching for storm water inflows in foul sewers using fibre-optic distributed temperature sensing

    A major drawback of separate sewer systems is the occurrence of illicit connections: unintended sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul sewer system. The amount of unwanted storm water in foul sewer systems can be significant, resulting in a number of detrimental effects on ...


    By IWA Publishing

  • Simplifying impact of urban development on sewer systems

    Linking urban development and urban drainage models is a more and more popular approach when impacts of pavement of urban areas on sewer system performance are evaluated. As such an approach is a difficult task, this is not a feasible procedure for everyday engineering practice. We propose an alternative method, based on a developed simple near-quadratic relationship, which directly translates ...


    By IWA Publishing

  • A simplified method for estimating chemical oxygen demand (COD) fractions

    A simplified method is presented for estimating chemical oxygen demand (COD) fractions. Its effectiveness was assessed by comparing different values found in literature. This case study considered two main sanitary sewer collection systems in Bogotá, Colombia. The results showed important differences in COD fractions between the sewer collection systems and the reference data. The method ...


    By IWA Publishing

  • Belfast city sewer case study

    Client: NIWater CSG provided a number of valves to go in to the newly refurbished Belfast City Sewer. Originally installed during Victorian times the sewer system has been updated in order to reduce flood risks and improve the general infrastructure. The project comes at a cost of £120M and encompasses over 10km of pipeline. It has won a number of awards for innovation and is the ...

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