weir Articles

  • The case for automatic weirs

    With hosepipe bans returning to parts of the country this summer, it’s easy to forget the disastrous floods of recent years – unless, of course, you were personally affected. This year’s harsh winter and modest levels of spring and summer rainfall belie a growing trend of more extreme weather events hitting the UK and a pattern of warmer winters and wetter summers. As we saw ...


    By Kijlstra LTD.

  • Weir floway case study

    When Weir Floway wanted to introduce an in-house PMI (Positive Metal Identification) facility, the handheld Niton XL3t XRF analyser provided the perfect solution. Weir Floway produce vertical turbine pumps from a variety of metallurgies ranging from copper alloys to superaustentics, super-duplex, and stainless steels. Their products are utilised for applications including mining, oil and gas, ...


    By Niton UK Limited

  • Experimental investigation on the efficiency of a high side weir overflow

    ABSTRACTMost of the overflow structures in Flanders are 'high side weir overflows'. For the design of these structures British guidelines are used. However, the design conditions for sewer systems in the U.K. differ from the Flemish design conditions. In Flanders, pressurised flow is in common use in the pipes of the sewer system. That is why tests have been carried out on a scale model of a ...


    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

  • Development of a discharge equation for side weirs using artificial neural networks

    ABSTRACT Flow over a side weir is one of the more complex flows to simulate in one-dimensional unsteady flow analysis. Various experiments have been applied, but no agreement is apparent in the literature about the best method. In this study, an Artificial Neural Network model has been used to extract a discharge equation for side weirs which accurately estimates overflow discharges. The ...


    By IWA Publishing

  • 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

  • River weir upgrade illustrates Rotork’s extended scope capabilities - Case Study

    Overview Rotork is well known for supplying flow control equipment for new and upgraded industrial plants and processes on a global scale. In these contracts, often involving tens or hundreds of valve actuators and associated control equipment, Rotork works with valvemakers, engineering companies and end users as one of several members of a project team, each with different areas of ...


    By Rotork

  • 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

  • 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

  • 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

  • Acoustic Doppler Current Profiler measurements near a weir with fish pass: assessing solutions to compass errors, spatial data referencing and spatial flow heterogeneity

    There has been an increasing interest in the use of Acoustic Doppler Current Profilers (ADCPs) to characterise the hydraulic conditions near river engineering structures such as dams, fish passes and groins, as part of ecological and hydromorphological assessments. However, such ADCP applications can be limited by compass errors, obstructed view to navigation satellites, frequent loss of ...


    By IWA Publishing

  • Optimise inlet condition and design parameters of a new sewer overflow screening device using numerical model

    After heavy rainfall, sewer overflow spills to receiving water bodies cause serious concern for the environment, aesthetics and public health. To overcome these problems this study investigated a new self-cleansing sewer overflow screening device. The device has a sewer overflow chamber, a rectangular tank and a slotted ogee weir to capture the gross pollutants. To design an efficient screening ...


    By IWA Publishing

  • Aftermath of the Long-Term Application of Sludge and Water from a Sewage Treatment Plant to a Lemon Tree (Citrus limon) Plantation

    The effect of sewage sludge application to agricultural soils in industrial countries (Raven and Loeppert 1997; Towers and Horne 1997) and that of the treated domestic and industrial effluents on plants (Hooda et al. 1997; Logan et al. 1997; Palacios et al. 1999; Samaras and Kallianou 2000, Weir and Allen 1997) have been ...


    By Springer

  • 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

  • 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

  • Increased plant efficiency, City of Checotah, Oklahoma

    The City of Checotah, Oklahoma was experiencing excessive solids, foam and grease in their 0.5 MGD extended aeration activated sludge treatment facility. With a daily average flow of 0.25 million gallons per day, the plant had tremendous amounts of foam and grease in the aeration basin with the sidewalls caked with sludge. The centerwells of the clarifier were filled with foam and grease. The ...


    By Byo-Gon, Inc.

  • Online flow measurement

    Background The undershoot weir in Hohensaaten was built in 1913. It has three openings and regulates the discharge from the Oderbruch and from the Finow canal into the Hohensaaten-Friedrichsthaler-waterway. Moreover, it protects parts of the Oderbruch against Oder floods. The weir controls the waterlevels in the Havel-Oder-waterway and in the reach of Niederfinow- Hohensaaten. ...

  • Physical Modeling Reveals Secrets, and Identifies Modifications to Improve Hydraulic Performance

    ABSTRACTA scaled physical model of the high purity oxygen process at the Sacramento Regional Wastewater Treatment Plant was used to evaluate the flow distribution problems and identify potential fixes. A comprehensive field testing program was implemented to collect data needed for calibrating and verifying the physical model. The calibrated physical model was then used to determine possible ...

  • Assessomg the Performance of Secondary Settling Tank by Means of Flow Modeling

    ABSTRACTA model of the double-decker rectangular settling tanks proposed for the Wastewater Treatment Plant of Besòs in Barcelona, Spain was prepared using Computational Fluid Dynamics (CFD). The modeling approach used was a three dimensional, multi-phase simulations with solids transport and removal included, and reflected the state of the art in clarifier modeling. Special attention was paid to ...

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