Weirs Articles

  • What is a Mineral Thickener Tank

    The Thickener Tank is a solid-liquid separation device based on gravity sedimentation. It is usually a cylindrical shallow groove and a tapered bottom. It is made of concrete, wood or metal welded plates as a structural material. An excellent thickener brand needs to meet two basic indicators: good equipment quality and innovation. In addition ...

  • D-Series decanter for sludge dewatering at RHV STEYR, Austria - Case Study

    The challenge: coping with increasing effluent in line with legislation ...

  • Los Andles & San Felipe WWTP Project - Case Study

    Customer: Geiger International GmbH (Germany) Project Name: Los Andles & San Felipe WWTP Manufacturing year: 2002 Scope of supply 2 pcs. Grit Scrapper 4 pcs. Circular Scrapper 2 pcs. ...


    By ASTIM A.S.

  • Scour depth model for grade-control structures

    Grade-control structures (GCS) are commonly used to protect fish habitat by preventing excessive river-bed degradation in mountain streams. However, flow over the GCS can cause localized scour immediately downstream of the weir. This paper aims to develop more accurate models for prediction of the maximum scour depth downstream of GCS, using a more extensive dataset and evolutionary gene ...


    By IWA Publishing

  • Flow Measurement in the Cold

    Measuring flow can be a very delicate process depending on the needs of your operation. For instance, measuring flow in cold weather locations is an extremely difficult task. When outdoor temperatures are near or below freezing, it makes it nearly impossible to measure flow as you would in normal circumstances, meaning you must find alternative solutions so that your operation continues to have ...


    By TRACOM Inc.

  • Weir Maintenance Tips and Tricks

    devices are self-cleaning and require very little maintenance. However, in some applications, measuring flow with a weir is a much better choice. While weirs are also very accurate, they do require regular maintenance in order to function properly. If you’ve never had to perform weir maintenance before, you should learn about a few of the most common maintenance tasks and their ...


    By TRACOM Inc.

  • Protecting against cross-contamination

    Protecting product from cross-contamination is critical, especially when it comes to seed and pulse crops. Your conveyance is where the risk for contamination is usually at its highest. This necessitates constant clean-out measures that take up valuable time and are less than cost-effective. Here at Norstar, we believe that chain conveyance provides a well-balanced solution to the issue of ...


    By Norstar Industries

  • 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

  • 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

  • Tideflex Valves vs Flap Valves

    MeasurIT are increasingly called upon by end users to provide Tideflex valves to replace faulty flap valves (see case studies here and  ...


    By MeasurIT Technologies Ltd.

  • Rotary batch mixer yields high-quality blends for powder metallurgy

    GKN Sinter Metals Inc. is the world's largest manufacturer of parts made by powder metallurgy, a molding process that produces complex shapes with a range of properties. Powder metallurgy offers benefits in part fabrication over competing metal processes. It is faster than forging or casting and permits the use of more performance-enhancing alloys than die-casting. GKN Sinter Metals, Auburn ...

  • Boundary conditions in finite volume schemes for the solution of shallow-water equations: the non-submerged broad-crested weir

    The broad-crested weir can be regarded as a zone of rapid variation of the bottom elevation that is short with respect to the characteristic length of the considered domain, and for this reason it can be conceptually modelled as a bed step. In this paper, the solution of the Riemann problem for the shallow-water equations over a bed step is exploited in order to simulate the behaviour of the ...


    By IWA Publishing

  • Rectangular side weirs discharge coefficient estimation in circular channels using linear genetic programming approach

    Side weirs are diversion structures extensively used in irrigation, flood protection and combined sewer systems. Accurate estimation of the discharge coefficient (Cd) of side weirs is essential to compute the water surface profile over the weirs and to determine the lateral outflow rate from the system. In this paper, we have utilized a linear genetic programming (LGP) technique ...


    By IWA Publishing

  • Simulation of overflow nappe impingement jets

    Rectangular jets constitute one of the energy dissipation methods in the overtopping of dams. The high turbulence and aeration phenomena that appear in falling jets and dissipation basins make it difficult to carry out studies based only on classical methodologies. There are studies modelling spillways with computational fluid dynamics which produces accurate results. However, the study of ...


    By IWA Publishing

  • Characteristics of gate–all–around polycrystalline silicon channel SONOS flash memory

    In this study, the gate–all–around (GAA) poly–Si channel flash memories with a nitride charge trap layer (Si3N4) have been successfully fabricated. Electrical characteristics of fabricated devices including the threshold voltage shift with program/erase operation have been investigated. Gate structures were formed differently according ...


    By Inderscience Publishers

  • Torque and flux ripple minimisation in direct torque control of induction motor using space vector modulation

    This paper explains the application of Space Vector Modulation (SVM) technique to reduce torque and flux ripple in an induction motor employing Direct Torque Control (DTC). The effective time is determined using imaginary time vector, thereby the lengthy procedure of using reference voltage vector is eliminated, and also the sector identification and angle determination are not used. Simulation ...


    By Inderscience Publishers

  • River weir upgrade illustrates Rotork’s extended scope capabilities

    Another part of Rotork’s activity involves actuators that are retrofitted on site as part of improvement projects which often also include additional work such as mechanical, electrical and civil engineering. The members of Rotork’s dedicated Site Services Division have many years experience of these projects, enabling them in many cases to organise the total supply of the work that ...


    By Rotork plc

  • Share some universal knowledge about HDPE flap valve

    HDPE flap valvespecifications of round and square HDPE flap valve two kinds, according to the size and shape of the outlet design and production; were hollow floats can knock on the door and a plate-plate HDPE flap valve. For pipes, sewage treatment, rivers ...

  • Performance evaluation of horizontal sharp crested weirs in a channel bend

    In some cases, construction of weirs and diversion structures in river bends is inevitable. There are a number of such hydraulic structures which were installed around the river bend without considering the undesirable effects of these structures on the river morphology which resulted in serious problems like that of erosion, sedimentation and non–symmetrical distribution of flow where water ...


    By Inderscience Publishers

  • Discharge coefficient of a broad crested side weir in an earthen channel

    Side weirs are widely used to divert flows from rivers and channels. However, the hydraulic behavior of this type of weir is complex and difficult to predict accurately. Previous studies on side weirs have generally focused on side weirs in rectangular channels with a smooth bed. However, one of the applications of side weirs is in irrigation systems which have trapezoidal cross sections and ...


    By IWA Publishing

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