Triangular Weir
Triangular Weir - Related Videos
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Sternberg's Triangular Theory of Love
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We typically love the people with whom we form relationships, but the type of love we have for our family, friends, and lovers differs. Robert Sternberg (1986) proposed that there are three components of love: intimacy, passion, and commitment. These three components form a triangle that defines multiple types of love: this is known as Sternberg’s triangular theory of love. Intimacy is the sharing of details and intimate thoughts and emotions. Passion is the physical attraction—the flame in the...
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Weir
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A weir is a hydraulic structure designed to partially obstruct an open channel, enabling precise control and measurement of water flow. By forcing water to flow over or through it, a weir allows for accurate determination of discharge rates, making it an essential tool in water resource management. These structures are extensively used in regulating river flows, irrigation systems, and flood control channels.Types of Weirs and Their FeaturesWeirs are categorized primarily into sharp-crested and...
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Water flow in open channels is often measured using hydraulic structures such as weirs, which allow precise calculation of discharge. In a rectangular channel, flow rates are measured using three types of weirs: rectangular sharp-crested, triangular sharp-crested, and broad-crested. The weir head is set at a fixed height above the channel bottom, simplifying calculations and enabling the relationship between depth and flow rate to be analyzed.For the rectangular sharp-crested weir, the flow...
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Rectangular and Triangular Pulse Function
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The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration. For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
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Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
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2025
This protocol describes methods for obtaining weir flow equation coefficients for a V-notch weir within a drainage control structure using (1) a laboratory calibration procedure and (2) an online tool, the "Weir Flow Equation Coefficients Calculator", developed by the authors. These methods apply to flows contained within the V-notch and overtopping flows.
FAQs
The upstream head, measured as the water depth above the notch vertex, provides the hydraulic quantity used to calculate discharge. For a triangular notch, the resulting relationship is proportional to head raised to the 5/2 power, so changes in head strongly affect the calculated flow rate. Accurate head measurement is therefore central to reliable open-channel flow assessment.
The notch angle and discharge coefficient adjust the discharge relationship to the geometry and hydraulic behavior of the measuring device. Gravitational acceleration also enters the calculation. Together with the measured upstream head, these parameters determine the estimated discharge, allowing the same measurement principle to represent different triangular-weir configurations without relying on head alone.
Free-flow conditions support the discharge relationship used for the weir, because the upstream head can then be related to flow passing through the notch as an unobstructed hydraulic measurement. If the stated operating condition is not maintained, the head-to-discharge calculation may no longer represent the intended behavior. Engineers therefore consider flow conditions when evaluating measurement validity.
Engineers observe the upstream head above the notch vertex, identify the notch angle, and apply the discharge relationship with gravitational acceleration and the appropriate discharge coefficient. The calculated result gives the channel discharge. This procedure converts a water-level measurement into a flow estimate and can be used to assess hydraulic performance in controlled channel systems.
This device is particularly useful when engineers need to measure relatively low flows. Its use extends to channel calibration and laboratory systems, where a known relationship between upstream head and discharge supports hydraulic evaluation. The approach is therefore relevant when a project requires a practical flow measurement for small discharges rather than a general observation of water depth.
Measurements can support hydraulic evaluations in irrigation, drainage, and wastewater systems. Engineers may also use the device to calibrate channels or laboratory flow arrangements by comparing the observed upstream head with the calculated discharge. These applications make the method useful for checking how an open-channel system performs under the free-flow conditions required for the discharge relationship.