sewer flow Articles

  • Sewer-Flow Survey Project

    Environmontel Ltd Supply of HydroLog4 time-series database and flow data processing system for sewer-flow survey projects Environmontel Ltd, an established flow-survey company based in Worcester, selected HydroLog4 as their sewer-flow survey information system for use by survey teams on short-term drainage-area surveys and other longer-term monitoring projects. The ...

  • Numerical modelling of air-water flows in sewer drops

    The presence of dissolved oxygen (DO) in water flows is an important factor to ensure the aerobic conditions recognised as beneficial to preventing the occurrence of detrimental effects. The incorporation of DO in wastewater flowing in sewer systems is a process widely investigated in order to quantify the effect of continuous reaeration through the air-liquid interface or air entrained due to ...


    By IWA Publishing

  • Innovative technologies for management of stormwater and combined sewer flows

    Stormwater flows have historically been considered as harmless. Studies have shown that these flows cannot be dismissed as easily. Chebbo (1992), Marsalek et al.,(1997) and others have shown that stormwater is a source of diffuse pollution with a high source of total suspended solids (TSS), adsorbed hydrocarbons (HC) and nutrient loads (N, P, etc..). All these factors influence the quality of the ...

  • Time for a re-examination of sewer design flow criteria

    Each year, many miles of new or rehabilitated sewer lines or pumping stations are designed and constructed based on flow criteria that may be unrelated to the desired level of system performance. Because of the need to reduce the risk of sanitary sewer overflows and sewer backups into buildings, it can be beneficial to re-examine the basis of sewer hydraulic design. Traditional approaches such as ...

  • Flow measurements in sewers based on image analysis: automatic flow velocity algorithm

    Discharges of combined sewer overflows (CSOs) and stormwater are recognized as an important source of environmental contamination. However, the harsh sewer environment and particular hydraulic conditions during rain events reduce the reliability of traditional flow measurement probes. An in situ system for sewer water flow monitoring based on video images was evaluated. Algorithms to determine ...


    By IWA Publishing

  • Sewer system flow components identification using signal processing

    The development of a continuous model to simulate the behaviour of sewer systems requires detailed information on each component of the flows contributing to the global discharge. In this paper authors investigate a novel method based on signal processing and long time series data implemented with a 2 min time step (flow rate, conductivity, pH and turbidity) in order to identify the dry weather ...


    By IWA Publishing

  • Sewer Sociology – The Days of Our (Sewer) Lives

    ABSTRACTFor centuries mankind has recorded life’s events through hieroglyphics, stories, and books. In similar fashion, those of us in the sewer business recognize the daily rhythm of people’s lives through the diurnal patterns of water and sewer use. Differences can be seen between weekdays, weekends, and holidays, and other distractions and disruptions of everyday life can often be seen as a ...

  • A bottom-up approach to estimate dry weather flow in minor sewer networks

    In order to evaluate the feasibility of installing decentralised installations for wastewater reuse in cities, information about flows at specific spots of a sewer is needed. However, measuring intermittent flows in partially filled conduits is a technical task which is sometimes difficult to accomplish. This paper describes a method to model intermittent discharges in small sewers by linking a ...


    By IWA Publishing

  • Attenuation of an ultrasonic beam by suspended particles and range of acoustic flow meters in sewer networks

    Ultrasonic flow meters are commonly used in wastewater management. Under certain circumstances, a reduction in the flow meter range may occur and cause significant error in the flow rate measurement. Attenuation due to suspended particles is one of the phenomena capable of reducing the flow meter range. The present paper examines attenuation resulting from re-suspended pond sediment over a wide ...


    By IWA Publishing

  • Influence of relative air/water flow velocity on oxygen mass transfer in gravity sewers

    Problems related to hydrogen sulfide may be serious for both network stakeholders and the public in terms of health, sustainability of the sewer structure and urban comfort. H2S emission models are generally theoretical and simplified in terms of environmental conditions. Although air transport characteristics in sewers must play a role in the fate of hydrogen sulfide, only a limited number of ...


    By IWA Publishing

  • Performance assessment of a vertical flow constructed wetland treating unsettled combined sewer overflow

    The performance of a vertical flow constructed wetland for combined sewer overflow treatment (CSO CW) has been evaluated. The full-scale site has been monitored for 3 years for major pollutants and for two load events for a range of micropollutants (metals, metalloids and polycyclic aromatic hydrocarbons (PAHs)). Performance were predominantly high (97% for total suspended solids (TSS), 80% ...


    By IWA Publishing

  • Municipal sewer remote monitoring

    Sewers are critical heavy duty infrastructure components requiring costly maintenance. Many municipalities suffer from ageing pipelines that pose higher chances of failure. Sewer leak or overflow results in high cost as a result of civil reimbursement and due to inflected illness. Moreover Civilian frustration that results form the overflow is often targeted towards the municipality. Overflow can ...

  • Will greywater reuse really affect the sewer flow? Experience of a residential complex in Al Ain, UAE

    Reuse of recycled wastewater is one of the most feasible unconventional urban water sources in the United Arab Emirates (UAE). The extraction and reuse of greywater might affect the water and sewer pipe networks by changing flow characteristics. Therefore, the research question is how much greywater can be reused without affecting the existing water and sewer pipe networks? A residential ...


    By IWA Publishing

  • The semi-sewer river: hydraulic backwater effects and combined sewer overflow reverse flows in Central Brussels reduce deoxygenation impact further downstream

    In 2011 and 2012 the dissolved oxygen content in the low-discharge river Zenne was monitored continuously, every 5 minutes, downstream of Brussels city centre, making it possible to document the complex mechanisms by which combined sewer overflow (CSO) spills affect both the hydraulics and the oxygen balance of the hydrosystem. In addition to oxygen demand impacts, proportions of water volumes ...


    By IWA Publishing

  • Sewer Level Monitoring - Photos

    Sewer Level Monitoring - Photos Photos in this article present the complexity and versatility of sewer level monitoring. When examining the photos, pay special attention to the stand-alone autonomous characteristics of each installation. In lack of any cabling from the outside, whether data cables or power cables, the solution is fed from its own battery power supply. Data is tranmitted ...

  • Sewer mining to supplement blackwater flow in a commercial high-rise Australia-Sydney case study

    Project Background or Rationale Australia’s warm climate and habitual droughts have resulted in innovative water conservation practices in commercial developments, such as 1 Bligh Street in Sydney. Commissioned in May 2011, the highly acclaimed 29 story office tower overlooking the Sydney Harbor captures nearly 100 percent of its wastewater and reuses it in the building. By recycling ...

  • Groundwater intrusion into leaky sewer systems

    Vast volumes of groundwater are drained by urban sewer systems. This unwanted flow component intrudes into sewer systems through leaky joints or connected house drains. However, unlike urban storm drainage, it has a high seasonal variation corresponding to groundwater storage and long slow recessions similar to baseflow in rivers also fed by shallow groundwater exfiltrating into the surface ...


    By IWA Publishing

  • Assessing dry weather flow contribution in TSS and COD storm events loads in combined sewer systems

    Continuous high resolution long term turbidity measurements along with continuous discharge measurements are now recognised as an appropriate technique for the estimation of in sewer total suspended solids (TSS) and Chemical Oxygen Demand (COD) loads during storm events. In the combined system of the Ecully urban catchment (Lyon, France), this technique is implemented since 2003, with more than ...


    By IWA Publishing

  • Release of hydrogen sulfide in a sewer system under intermittent flow conditions: the Eiceira case study, in Portugal

    The presence and fate of hydrogen sulfide in wastewater systems were studied in two stretches of an intercepting sewer system located in a coastal village, in Portugal. A range of hydraulic parameters were obtained and liquid and gas phase measurements were carried out, both continuously and through intensive sampling campaigns. Upstream, where flow rates were relatively low, dissolved sulfide ...


    By IWA Publishing

  • 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 ...


    By Springer

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