Weirs, Sluices, Flumes, Gates Articles

  • New Geotechnical Tiltmeter with MEMS Technology

    Introducing the 850 MEMS Tuff Tilt Series, the latest addition to Jewell Instruments’ electrolytic tiltmeter line for geophysical & geotechnical applications. This versatile, rugged, weatherproof tiltmeter is a low-cost alternative to most sensors ...


    By Eneco

  • Sensitivity analysis on the pollutant trapping efficiencies of a novel sewerage overflow screening device

    A novel ‘Comb Separator’ was developed and tested with the aim of improving sewer solids capture efficiency and reducing blockages on the screen. Experimental results were compared against the industry standard ‘Hydro-Jet™’ screen. Analysing the parameter sensitivity of a hydraulic screen is a standard practice to get better understanding of the device performance. In order to understand the ...


    By IWA Publishing

  • 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 ...

  • Sediment deposit thickness and its effect on critical velocity for incipient motion

    The understanding of how the sediment deposit thickness influences the incipient motion characteristic is still lacking in the literature. Hence, the current study aims to determine the effect of sediment deposition thickness on the critical velocity for incipient motion. An incipient motion experiment was conducted in a rigid boundary rectangular flume of 0.6 m width with varying sediment ...


    By IWA Publishing

  • Improving flow distribution in influent channels using computational fluid dynamics

    Although the flow distribution in an influent channel where the inflow is split into each treatment process in a wastewater treatment plant greatly affects the efficiency of the process, and a weir is the typical structure for the flow distribution, to the authors' knowledge, there is a paucity of research on the flow distribution in an open channel with a weir. In this study, the influent ...


    By IWA Publishing

  • 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

  • Prediction of side weir discharge coefficient by support vector machine technique

    Side weirs have many possible applications in the field of hydraulic engineering. They are also considered an important structure in hydro systems. In this study, the support vector machine (SVM) technique was employed to predict the side weir discharge coefficient. The performance of SVM was compared with other types of soft computing techniques such as artificial neural networks (ANN) and ...


    By IWA Publishing

  • Modelling of suspended sediment in a weir reach using EFDC model

    Construction of hydraulic structures often leads to alteration of river dynamics and water quality. Suspended solids entering the upstream of the weir cause adverse effects to the hydroecological system and, therefore, it is necessary to build a modelling system to predict the changes in the river characteristics for proper water quality management. In this study, the discharges and total ...


    By IWA Publishing

  • Denitrification and Floating Sludge

    What is Denitrification? Denitrification is the conversion of soluble nitrate to nitrogen gas in the nitrogen cycle. For denitrification to occur, three factors are needed: Presence of Nitrate Anoxic conditions (no free dissolved oxygen) A carbon source (soluble BOD) Floating Sludge Denitrification is useful and ...

  • Contribution to a flood situation management: a supervisory control scheme to reduce disaster impact

    Inundations due to river overflows are becoming more frequent; management of flood is thus an important task belonging to the set of preventive measures allowing the protection of people and goods downstream. The flood situation management method proposed in this paper was designed to reduce the flood impact at its early arising stage. The river is supposed to be equipped with reservoirs in ...


    By IWA Publishing

  • ROMAG storm water screen system for the CSO works La Maladière in Neuenburg

    With the RSW-K high-capacity storm water screen and a emergency shut-off valve, the volume of the upstream sewerage system is optimally utilized and the receiving body ideally protected against contamination. The storm water screen removes visible solids from the sewage water before the water is discharged into the receiving body. At the La Maladière surplusing works, the ROMAG RSW-K ...


    By ROMAG aquacare ag

  • Distributions of phosphorus fractions in the sediments of a river–lake system: a case study in Huai River catchment area, China

    Phosphorus (P) forms, with respect to sediment characteristics, and an in-stream sluice were studied in the river–lake system, Huai River catchment area, China. The mean of total P in sediments in the mainstream of the Huai River was higher than that in the Hongze Lake. It was found that P fractions varied in the sediments throughout the river and lake. Detrital-P was the dominant P ...


    By IWA Publishing

  • Four free surface algorithms for the 3D Navier–Stokes equations

    Four algorithms are described for computing a steady free water surface with the solution of the three-dimensional (3D) Navier–Stokes equations. The numerical methods are used in hydraulic engineering cases, typically spillways and river modelling. The algorithms were tested against a laboratory experiment of a v-shaped broad-crested weir. The complex geometry of the weir introduced ...


    By IWA Publishing

  • Rotork valve actuators at hub of automated flood alleviation scheme - Case Study

    Overview An extended scope contract performed by Rotork Site Services has successfully delivered full automation of a flood alleviation scheme protecting the historic town of Cardigan in West Wales. The project involved replacing unreliable actuators from another manufacturer, installing a PLC control cabinet and interfacing with the existing river level sensor and telemetry system. ...


    By Rotork

  • Implementation strategies and a cost/benefit comparison for compliance with an environmental flow regime in a Mediterranean river affected by hydropower

    Compliance with the Water Framework Directive (WFD) of the European Union requires water managers to establish environmental flow regimes (EFR) in rivers across the continent. Few water agencies have examined the economic and social welfare impacts of implementing environmental flow requirements. We present the approach used by the Catalan Water Agency to calculate an EFR and estimate the ...


    By IWA Publishing

  • Gas assisted chair mold solution

    Gas assisted molding is widely used in manufacturing hollow plastic parts, light weight but strong strength. Especially for chair mold, then how to manufacture good quality gas assisted chair mould? First the material used. Here are three solutions: 1. pure PP 2. PP plus ...


    By Focare Mould Co.,Ltd.

  • Hundreds of Options Facing Power Plants Purchasing New or Upgrading

    The wet calcium (lime and limestone) process is only one option for removing SO2. Dry systems, ammonium sulfate, seawater, amine and other processes are also alternatives. Assuming that the purchaser has decided to purchase a new or upgrade an existing wet calcium FGD system, he must then make hundreds of decisions about processes and components. These systems represent up to 15 percent of the ...


    By The McIlvaine Company

  • Concrete infilled Channels research at Colorado state university Hydraulics labratory - Case Study

    Geoweb® Cellular Confinement Systems are used for applications such as load support, earth retention, porous pavement, and slope and channel erosion protection. The product can also be utilized in the efficient formation of concrete structures such as levees, stream bank revetment, or slope protection, allowing for rapid installation without the use of stakes or the need for curing. A testing ...


    By Presto Geosystems

  • A comparison of two infiltration models applied to simulation of overland flow over a two-dimensional flume

    At the hillslope scale, where the rill-interrill configuration plays a significant role, infiltration is one of the major hydrologic processes affecting the generation of overland flow. As such, it is important to achieve a good understanding and accurate modelling of this process. Horton's infiltration has been widely used in many hydrologic models, though it has been occasionally found ...


    By IWA Publishing

  • Dual-use value of network partitioning for water system management and protection from malicious contamination

    This paper considers the introduction of a contaminant into a water supply system using a backflow attack. The recent development of techniques for water network sectorization, aimed at improving the management of water systems, is also an efficient way to protect networks from intentional contamination and to reduce the risk of the dangerous effects of network contamination. Users can be ...


    By IWA Publishing

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