sewer modeling Articles | Environmental XPRT

A dynamic ventilation model for gravity sewer networks

To implement any effective odour and corrosion control technology in the sewer network, it is imperative that the airflow through gravity sewer airspaces be quantified. This paper presents a full dynamic airflow model for gravity sewer systems. The model, which is developed using the finite element method, is a compressible air transport model. The model has been applied to the North Head ...

Nov. 30, 2011

By IWA Publishing

A sewer ventilation model applying conservation of momentum

The work presented herein was completed in an effort to characterize the forces influencing ventilation in gravity sewers and to develop a mathematical model, based on conservation of momentum, capable of accounting for friction at the headspace/pipe interface, drag at the air/water interface, and buoyancy caused by air density differences between a sewer headspace and ambient. Experiments were ...

Dec. 31, 2010

By IWA Publishing

Evaluating the role of deterioration models for condition assessment of sewers

Ensuring reliable structural condition of sewers is an important criterion for sewer rehabilitation decisions. Deterioration models applied to sewer pipes support the rehabilitation planning by means of prioritising pipes according to their current and predicted structural status. There is a benefit in applying such models if sufficient inspection data for calibration, an appropriate ...

Aug. 20, 2015

By IWA Publishing

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 ...

Apr. 27, 2017

By IWA Publishing

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 ...

Sep. 30, 2010

By IWA Publishing

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 ...

Nov. 12, 2010

By IWA Publishing

An approximate model on three-dimensional groundwater infiltration in sewer systems

Groundwater infiltration through cracked sewer pipes has caused significant economic losses. This paper presents a three-dimensional analytical expression for calculating the steady-state groundwater infiltration rate into sewer systems. As an extension of the previously developed two-dimensional model by the author, this new model can be used to simulate the infiltration through an orifice ...

Nov. 8, 2016

By IWA Publishing

Development of a semi-automated model identification and calibration tool for conceptual modelling of sewer systems

Applications such as real-time control, uncertainty analysis and optimization require an extensive number of model iterations. Full hydrodynamic sewer models are not sufficient for these applications due to the excessive computation time. Simplifications are consequently required. A lumped conceptual modelling approach results in a much faster calculation. The process of identifying and ...

Jul. 3, 2013

By IWA Publishing

Picking the right Sewer Camera

Sewer camera models are pretty straightforward, in most cases. But, there are many options if you want a sewer camera or commonly called snake camera. This type comes many varieties: Pipe Inspection camera with viewing capabilities only, sewer ...

Sep. 25, 2017

By USA Borescopes

A review of sulfide emissions in sewer networks: overall approach and systemic modelling

The problems related to hydrogen sulfide in terms of deterioration of sewer networks, toxicity and odor nuisance have become very clear to the network stakeholders and the public. The hydraulic and (bio)chemical phenomena and parameters controlling sulfide formation, emission and their incidences in sewer networks are very complex. Recent research studies have been developed in gravity and ...

Dec. 9, 2015

By IWA Publishing

Predicting wastewater temperatures in sewer pipes using abductive network models

A predictive modelling technique was employed to estimate wastewater temperatures in sewer pipes. The simplicity of abductive predictive models attracts large numbers of users due to their minimal computation time and limited number of measurable input parameters. Data measured from five sewer pipes over a period of 12 months provide 33,900 training entries and 39,000 evaluation entries to ...

Jan. 20, 2015

By IWA Publishing

Integration of urban runoff and storm sewer models using the OpenMI framework

This paper presents an integrated modeling approach that combines the legacy urban runoff and the legacy storm sewer models with data exchange at runtime to simulate sewer flows with real-time rainfalls. A software system called IRES has been developed to demonstrate the proposed approach. IRES uses the RUNOFF and the EXTRAN block of Storm Water Management Model (SWMM) as the legacy urban ...

Sep. 24, 2012

By IWA Publishing

Modeling fats, oil and grease deposit formation and accumulation in sewer collection systems

Fats, oil and grease (FOG) deposits in sewer systems are responsible for approximately 25% of all annual line blockages in the United States and lead to the release of 3–10 million gallons of untreated wastewater to the surrounding environment. Considerable effort has been made to maintain the conveyance of wastewater by cleaning pipes that have a significant FOG deposit accumulation. Changes ...

Mar. 6, 2017

By IWA Publishing

Use of sewer on-line total solids data in wastewater treatment plant modelling

We describe a neural network model of a municipal wastewater treatment plant (WWTP) in which on-line total solids (TS) sewer data generated by a novel microwave sensor is used as a model input variable. The predictive performance of the model is compared with and without sewer data and with modelling with a traditional linear multiple linear regression (MLR) model. In addition, the benefits of ...

Jul. 31, 2010

By IWA Publishing

Modelling sewer sediment deposition, erosion, and transport processes to predict acute influent and reduce combined sewer overflows and CO2 emissions

Understanding of solids deposition, erosion, and transport processes in sewer systems has improved considerably in the past decade. This has provided guidance for controlling sewer solids and associated acute pollutants to protect the environment and improve the operation of wastewater systems. Although measures to decrease combined sewer overflow (CSO) events have reduced the amount of ...

Oct. 31, 2010

By IWA Publishing

Aerobic and Anaerobic Transformations of Sulfide in a Sewer System – Field Study and Model Simulations

ABSTRACTThe formation and fate of sulfide in a force main and a downstream-located gravity sewer were investigated in an extensive field study. Sulfide formation during approximately 4 hours of anaerobic transport in the force main was significant. The following gravity sewer was aerobic and a fast reduction of the sulfide concentration was observed due to sulfide oxidation and emission of ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Modelling the erosive effects of sewer flushing using different sediment transport formulae

A numerical investigation to simulate the cleaning effects of successive flushes over sediment beds in prismatic channels is presented in this paper. The 1D De Saint Venant-Exner equations were used to describe the temporal evolution of the sediment bed after each flush. The predictive capacity of two sediment transport formulae was explored against experimental results from laboratory tests. ...

Mar. 18, 2014

By IWA Publishing

Improving the benefits of sewer condition deterioration modelling through information content analysis

As urban sewer infrastructures age, it becomes increasingly important to make effective decisions to maintain the structural condition of the sewers at an acceptable level. To support the decision-making process, the utility manager can apply sewer deterioration models. However, the quality of the decision support from such models is dependent on the accuracy and reliability of the ...

Aug. 30, 2016

By IWA Publishing

VortSentry storm sewer upgrade, Markham, ON

Customer: Brennan Paving Engineering Firm: URS Consultants Contractor: Brennan Paving Approving Agency: URS Consultants & M.O.E. Project Details: This project involved the widening and improving the existing storm sewers on Warden Avenue in the Town of Markham. Some of the products supplied on ...

Oct. 28, 2011

By Armtec

VortSentry storm sewer upgrade, Markham, ON

Customer: Brennan Paving Engineering Firm: URS Consultants Contractor: Brennan Paving Approving Agency: URS Consultants & M.O.E. Project Details: This project involved the widening and improving the existing storm sewers on Warden Avenue in the Town of Markham. Some of the products supplied on ...

Oct. 28, 2011

By Armtec

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