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Related Concept Videos

Design Example: Design of an Irrigation Channel01:27

Design Example: Design of an Irrigation Channel

Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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...
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...
Energy Considerations in Open Channel Flow01:27

Energy Considerations in Open Channel Flow

Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
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...

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Related Experiment Video

Updated: Jul 12, 2026

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow
05:42

Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

Published on: January 7, 2019

Channelization: a case study.

J W Emerson

    Science (New York, N.Y.)
    |July 23, 1971
    PubMed
    Summary

    Channelization of the Blackwater River increased erosion and widened the channel, leading to farmland loss and bridge damage. Reduced dredging downstream has caused sedimentation and increased flooding.

    Area of Science:

    • Environmental Science
    • River Geomorphology
    • Hydrology

    Background:

    • River channelization projects can have long-term geomorphological impacts.
    • The Blackwater River in Johnson County, Missouri, underwent channelization 60 years prior.

    Purpose of the Study:

    • To assess the geomorphological and hydrological consequences of Blackwater River channelization.
    • To understand the impacts of altered river dynamics on the surrounding environment and infrastructure.

    Main Methods:

    • Analysis of historical channel changes.
    • Assessment of river gradient and erosion rates.
    • Evaluation of downstream sedimentation and flooding patterns.

    Main Results:

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

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    Related Experiment Videos

    Last Updated: Jul 12, 2026

    Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow
    05:42

    Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow

    Published on: January 7, 2019

    Watershed Planning within a Quantitative Scenario Analysis Framework
    12:44

    Watershed Planning within a Quantitative Scenario Analysis Framework

    Published on: July 24, 2016

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

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  • Channelization nearly doubled the river's gradient, significantly increasing erosion rates.
  • The river channel has widened and deepened post-channelization, resulting in farmland loss and necessitating bridge repairs.
  • Cessation of downstream dredging has led to reduced channel capacity, causing sedimentation and exacerbating flood events.
  • Conclusions:

    • River channelization has led to detrimental and persistent geomorphological changes.
    • Altered river dynamics pose risks to infrastructure and agricultural land.
    • Management of river dredging and capacity is crucial for mitigating sedimentation and flooding.