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Related Concept Videos

Weir: Problem Solving01:26

Weir: Problem Solving

24
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...
24
Weir01:24

Weir

23
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...
23
Underflow Gates01:30

Underflow Gates

28
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
28
Gradually Varying Flow01:29

Gradually Varying Flow

20
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
20
Rapidly Varying Flow01:24

Rapidly Varying Flow

36
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
36
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

88
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
88

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Related Experiment Video

Updated: May 14, 2025

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
07:07

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure

Published on: April 25, 2025

108

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure.

Sheela Katuwal1, Andrew J Craig2, Andrew W Rupiper3

  • 1National Laboratory for Agriculture and the Environment, USDA-ARS.

Journal of Visualized Experiments : Jove
|May 12, 2025
PubMed
Summary
This summary is machine-generated.

Accurate drainage discharge estimation is crucial for water quality and conservation practices. This study presents methods and a calculator for developing precise weir flow equations, improving flow rate monitoring.

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Area of Science:

  • Agricultural Engineering
  • Hydrology
  • Environmental Science

Background:

  • Accurate estimation of drainage discharge is vital for nutrient load calculations and evaluating conservation practices.
  • Existing weir flow equations for control structures often yield inconsistent coefficients for identical weir types and sizes.
  • Reliable flow rate data is essential for effective water resource management.

Purpose of the Study:

  • To describe experimental procedures for measuring water flow rate and head in drainage control structures.
  • To develop a V-notch weir equation for contained flows and outline a method for overtopping flows.
  • To introduce an online tool for generating weir flow equation coefficients for various Agri Drain structures.

Main Methods:

  • Experimental setup for precise water flow rate and head measurements within a drainage control structure.
  • Development of a V-notch weir equation based on laboratory measurements.
  • Utilizing an online calculator for weir flow equation coefficients for both contained and overtopping flows.

Main Results:

  • Established procedures for accurate flow rate and head measurements.
  • Developed a specific weir equation for V-notch weirs.
  • Created an accessible online tool for calculating weir flow coefficients, applicable to various structure sizes.

Conclusions:

  • The study provides a robust methodology for developing site-specific weir equations.
  • The "Weir Flow Equation Coefficients Calculator" enhances accessibility to accurate flow estimation tools.
  • Improved flow rate estimation supports better water quality monitoring and conservation practice assessment.