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Related Concept Videos

Rapidly Varying Flow01:24

Rapidly Varying Flow

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...
Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
Bernoulli's Equation: Problem Solving01:16

Bernoulli's Equation: Problem Solving

A Venturi meter is essential for measuring fluid flow rates in pipelines. It utilizes the relationship between fluid velocity and pressure described by Bernoulli's equation. When installed in a sewage system, the Venturi meter accurately determines the wastewater flow rate by measuring pressure differences.
The first step is to compute the cross-sectional areas of the pipe and the Venturi throat to analyze the pressure difference indicated by the pressure gauge. Next, the continuity equation is...
Gradually Varying Flow01:29

Gradually Varying Flow

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...
Plane Potential Flows01:23

Plane Potential Flows

Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform Flow
Uniform flow...

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Related Experiment Video

Updated: May 26, 2026

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
09:37

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole

Published on: August 26, 2019

Flow measurements in sewers based on image analysis: automatic flow velocity algorithm.

D Jeanbourquin1, D Sage, L Nguyen

  • 1Ecological Engineering Laboratory (ECOL), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|January 5, 2012
PubMed
Summary
This summary is machine-generated.

A new video-based system reliably measures sewer water flow velocity, overcoming challenges posed by harsh environments and traditional probe limitations. This technology enhances understanding of combined sewer overflow (CSO) hydraulic behaviors.

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Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Area of Science:

  • Environmental Engineering
  • Hydraulics
  • Water Resource Management

Background:

  • Combined sewer overflows (CSOs) and stormwater discharges are significant environmental contaminants.
  • Traditional flow measurement probes face reliability issues in harsh sewer environments and during rain events.

Purpose of the Study:

  • To evaluate an in situ sewer water flow monitoring system utilizing video images.
  • To develop and implement image-processing algorithms for accurate water velocity determination.

Main Methods:

  • Developed image-processing algorithms to identify surface features and track their movement.
  • Utilized a web-based interface and three-tier architecture for remote camera and algorithm configuration.
  • Calculated flow velocity on-line using real-world coordinate mapping.

Main Results:

  • The video-based system demonstrated reliable measurement of water velocities in a CSO.
  • The system successfully captured and analyzed hydraulic behaviors during overflow events.

Conclusions:

  • The developed system offers a reliable solution for sewer water flow monitoring.
  • This technology provides valuable insights into sewer hydraulic behaviors, aiding environmental management.