Weirs, Sluices, Flumes, Gates Articles

  • How access to knowledge can help stop malaria

    Malaria can be prevented and cured, yet it is still a major problem in more than 90 countries. The World Health Organization estimates that there were 212 million cases of malaria in 2015, leading to 429 000 deaths. ...


    By Elsevier B.V

  • Case study - Hadleys

    Material Source: Excavation waste from construction sites.  Equipment Installed: Main components included: Commander 1400 Hopper Feed Conveyor 16 x 5 Rinsing Screen Logwasher c/ with Dewatering Screens Finesmaster 120 Sand Plant 16 x 5 Dry Screen Bivitec Pre- Screen System ...


    By DUO (Europe) plc

  • South Texas Landfill − Case Study

    During 2011, four QED Precision Fine Tune Control Valves™ were installed in wells at a south Texas landfill. The following graphs show the composition of the landfill gas and flow data before and after the installation of the Control Valves in Wells 07, 54, 78, and 90. The closest neighboring well on the same trunk line, using a gate valve for flow control, was also chosen for an additional ...


    By QED Environmental Systems

  • Calibration of the 1D shallow water equations: a comparison of Monte Carlo and gradient-based optimization methods

    The calibration of parameters in complex systems usually requires a large computational effort. Moreover, it becomes harder to perform the calibration when non-linear systems underlie the physical process, and the direction to follow in order to optimize an objective function changes depending on the situation. In the context of shallow water equations (SWE), the calibration of parameters, ...


    By IWA Publishing

  • Valves in Water System of Heating Air Condition

    Common valves in water system of heating air condition include gate valve, globe valve and butterfly valve.   Gate vale For its moderate length, rotary adjusting rod and good regulating performance, gate valve is widely utilized in large caliber pipes.   Globe valve Globe valve is suitable for small caliber pipes for its long length, ...

  • Xinhai Statement of the Implement Valve Standards

    Following are the design, manufacture and inspection standards of our company.   Check Valve: API 6D 24th Specification for Pipeline and Piping valves BS 1868-1975(R1990) Specification for Check Valves (Flanged and Butt-welding Ends) for the Petroleum, Petrochemical and Allied Industries EN14341-2006 Industrial valves —Steel Check Valves ...

  • 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 ...

  • Optimal control of reservoir release temperature through selective withdrawal intake at hydropower dam

    This study is motivated by the need to understand the temperature dynamics and warm-water temperature withdrawal. This study also recognizes the need for an environmental assessment of the proposed temperature control schemes at New Fengman Dam. An unsteady three-dimensional (3D) non-hydrostatic model is used in the present study to predict the hydrodynamics and thermal dynamics in the forebay ...


    By IWA Publishing

  • 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

  • A real-time, rapid emergency control model for sudden water pollution accidents in long-distance water transfer projects

    A real-time, rapid emergency control (EC) model is proposed to cope with sudden water pollution accidents in long-distance water transfer projects. The EC model outputs the method of EC based on pollutant properties. A generalized form of EC model is proposed and tested with a demonstrative project. The rapid prediction formulas of emergency control parameters (ECPs) are proposed under ...


    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

  • River safe yield with the constraint of a contracted rectangular weir for surface water supply

    Aydin et al. introduced the weir velocity concept in 2011 for discharge measurement in contracted rectangular sharp-crested weirs. Gharahjeh et al. further reinforced this formula in 2015 to allow discharge to be computed using only weir velocity and crest width. These newly introduced expressions are tested and demonstrated to determine surface water yield of Tapah River in ...


    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

  • Assessment of riverside groundwater flood risk induced by high river water levels using a numerical model and monitoring data

    Large barrages have been constructed on the main rivers in South Korea to store water and mitigate fluvial flooding damage. However, the increase in water levels behind the barrages can potentially lead to a rise in groundwater levels in the riversides. The purpose of this study was to describe the effect of a barrage on groundwater levels and to test the applicability of a numerical model to ...


    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

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