Water Flow Monitoring Articles

  • White Paper: Cyclical Aeration Control- Combining Aerobic & Anoxic Conditions in One Basin

    Increase Water Quality with Cyclical Aeration With increased effluent pollution restrictions on municipal wastewater treatment plants, cities are pressed to find ways to economically increase their effluent quality with little to no funding. Many new NPDES permits ...

  • Freezing Temperatures Could Place Commercial Properties in Hot Water

    With another frigid winter on the way, frozen cooling tower valves and pipe leaks are likely to wreak havoc on commercial property water usage. “As temperatures dropped below zero last year, we began receiving dozens of calls from property managers about their cooling tower’s solenoid valve freezing in the fill position and water continuously flowing out,” states David ...


    By WaterSignal

  • Start Preparing for Winter With Our Winterizing Checklist

    We’re a little over halfway through October, which means winter is near and frigid temperatures are just around the corner. Whether you’re a property manager, building owner, or maintenance professional, you can never be too prepared for what the winter has in store. Preparation is the name of the game. As subzero winter temperatures roll in, even the ...


    By WaterSignal

  • New Expansion for Pulsar in China

    British non-contacting measurement and control specialists Pulsar Process Measurement have strengthened the team in China with the appointment of Eric Shi as National Sales Manager. He joins the growing Pulsar team who support customers and distributors throughout Asia, supported by the Regional Head Office in Kuala Lumpur, Malaysia. Eric joins Pulsar after ten years experience working ...

  • Skid Systems - Case Study

    A Chemical Metering Pump is seldom used by itself. It is usually a part (ok, the part) of a chemical injection system into a process. Such a system requires various accessories, valves and controls to dispense the exact amount of chemical demanded by the application which may itself vary. Let us say if you are using chemical pump to achieve pH balance for the water. You need to measure the pH of ...

  • Treating wastewater as a resource

    A number of UK landfill operators are turning wastewater into a resource by utilising OTT monitoring and control systems to manage the irrigation of Willow crops (for renewable energy generation) with pre-treated effluent. Background Leachate from landfill sites represents a significant potential environmental liability, extending long into the future after a landfill site has ...

  • Numbers Speak Volumes: Water Distribution Assessment Increases System Operability To 84 Percent

    This large Midwest utility maintains and operates water collection, treatment, and distribution systems, as well as wastewater collection and treatment systems and stormwater management systems for its residential, business and wholesale customers in the region. To ensure the accessibility and quality of water services to meet the growing needs of the ...


    By Pure Technologies

  • Staying dry with rising tides – miami beach - Case Study

    The City of Miami Beach, Florida, USA is a beautiful resort community nestled between the Atlantic Ocean and Biscayne Bay. Miami Beach is built on natural and man-made barrier islands. Infrastructure which ensures residents and tourists in Miami Beach aren’t regularly flooded by sea water is often taken for granted however with a changing climate it has become evident to residents that ...


    By Wapro AB

  • WaReg protects homes from flooding in Sweden - Case Study

    Location: Backaryd, Sweden Customer: Backaryds Vattenverk Problem: Backaryd Water Treatment plant backwash their filters regularly. During this process water is released into the town sewer network at a rate of 16 l/s. The towns sewer network is dimensioned to cope with 5 l/s so when it receives 16 l/s it becomes problematic for downstream residents. When the backwashing occurs, homes in ...


    By Wapro AB

  • Horsepower on the pump curve

    Now that the head capacity relationship along the X and Y axes of the pump curve has been established in Part 1 of this series, the pump curve can be used to determine the amount of horsepower required to meet the head and capacity requirements for the job. Horsepower is a unit of power equal to 550 foot pounds per second or 746 watts. Water horsepower is the minimum power ...

  • Country Club Stream, Bank Stabilization - Case Study

    Akron, Ohio Worked with engineers and landscaping firm to repair country club stream on holes 4 and 10 that were damaged by a volatile adjacent stream. We used matting to ensure the surrounding area was not damaged by our equipment as we excavated and widened the creek. Stream restoration, we rebuilt the channel and waterfall using placed rock and added j-hooks and v-weir structures ...

  • Importance of measuring UV transmittance (UVT) for UV disinfection

    UV disinfection systems disinfect water using UV light at the 254 nm wavelength. UV light at this wavelength actually destroys the DNA of microbiological material in the water which prevents dangerous viruses such as cryptosporidium and e-coli from reproducing and causing harm. UV Disinfection Dose and UV Transmittance (UVT) The effectiveness of a UV disinfection system is ...


    By Real Tech Inc.

  • Measurement of NAPL–water interfacial areas and mass transfer rates in two-dimensional flow cell

    The nonaqueous-phase liquid (NAPL)–water interfacial area and the mass transfer rate across the NAPL and water interface are often key factors in in situ groundwater pollution treatment. In this study, the NAPL–water interfacial area and residual NAPL saturation were measured using interfacial and partitioning tracer tests in a two-dimensional flow cell. The results were compared with ...


    By IWA Publishing

  • Modeling scour depth downstream of grade-control structures using data driven and empirical approaches

    Local scour occurs in the immediate vicinity of structures as a result of impinging on a bed with a high velocity flow. Prediction of scour depth has an important role in control structure management and water resource engineering issues, so a study of new heuristic expressions governing it is necessary. The present study aims to investigate different methods' capabilities to estimate scour ...


    By IWA Publishing

  • Experimental observation on factors affecting intrusion volumes during low or negative pressure events

    External water intrusion during low or negative pressure transient events in urban water supply systems may cause pollution and health problems. The volume of intrusion pollutants is one of the significant indicators that can reflect the degree of health risks when a pollution incident occurs. A pilot-scale platform was constructed in this study to simulate intrusion events, which were caused ...


    By IWA Publishing

  • Calibration using 5 flow sensors saves the effort of extensive reconstruction measures

    "Abwasserzweckverband Breisgauer Bucht", a municipal association for sewage treatment in the south of Germany, operates a central wastewater treatment plant for its members (29 communities and cities). The WWTP covers a catchment area of 650km² and its treatment capacity is 600.000 population equivalents. The plant is treating wastewater from 375.000 residents as well as from industry and ...


    By NIVUS GmbH

  • Longitudinal dispersion in open channel flow with suspended canopies

    Suspended canopies can cause flow disturbances such as reducing velocities within the canopy, and increasing flow beneath the canopy. Flow modifications by canopies dramatically affect the fate and transport of sediment, nutrients, contaminants, dissolved oxygen, and fauna in aquatic systems. A three-zone model is presented here to predict the longitudinal dispersion coefficient by simplifying ...


    By IWA Publishing

  • Maintenance tips for cooling towers - White Paper

    Cooling towers are prone to the typical causes of rotating machine failure such as misalignment, but also face a range of specific environmental challenges, including high or gusting wind speeds, dust, sand and, in coastal locations, high concentrations of salt. In the 1990s, for example, vibration and accelerated wear caused a fan blade to shear off a cooling tower in Pennsylvania, ...


    By Hansford Sensors

  • Improvement of multi-parameter-based feed-forward coagulant dosing control systems with feed-back functionalities

    Coagulant dosing control in drinking and wastewater treatment plants (WWTPs) is often limited to flow proportional concepts. The advanced multi-parameter-based dosing control systems have significantly reduced coagulant consumption and improved outlet qualities. Due to the long retention time in separation stages, these models are mostly based on feed-forward (FF) models. This paper ...


    By IWA Publishing

  • Modelling flows in shallow (fluvial) lakes with prevailing circulations in the horizontal plane: limits of 2D compared to 3D models

    The numerical modelling of circulations in shallow lakes is a relevant tool for all environmental applications in which flow advection processes are of interest, e.g. for studies on nutrients, microorganisms, pollutants and sediment dynamics. While three-dimensional (3D) models are needed to properly describe the flow fields of basins with the main circulations in the vertical plane, ...


    By IWA Publishing

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