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Rapidly Varying Flow01:24

Rapidly Varying Flow

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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...
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Gradually Varying Flow01:29

Gradually Varying Flow

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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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Regulation of Water Output01:26

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The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
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Underflow Gates01:30

Underflow Gates

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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...
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Design Example: Design of an Irrigation Channel01:27

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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...
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Quality of Water01:19

Quality of Water

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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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Related Experiment Video

Updated: Sep 22, 2025

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
12:50

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

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Where rivers jump course.

Sam Brooke1, Austin J Chadwick2, Jose Silvestre3

  • 1Department of Geography, University of California Santa Barbara, Santa Barbara, CA, USA.

Science (New York, N.Y.)
|May 26, 2022
PubMed
Summary
This summary is machine-generated.

River avulsions, which cause floods, are poorly understood. This study analyzed 113 global avulsions over 50 years, identifying key controls on their locations and improving flood hazard prediction.

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Area of Science:

  • Fluvial geomorphology
  • Hydrology
  • Remote sensing applications

Background:

  • River avulsions are abrupt channel shifts causing significant floods.
  • Understanding avulsion controls is crucial for hazard assessment but limited by sparse data.

Purpose of the Study:

  • To identify and characterize the primary controls on river avulsion locations globally.
  • To enhance the understanding of factors influencing flood hazards.

Main Methods:

  • Analysis of nearly 50 years of global satellite imagery.
  • Documentation and spatial analysis of 113 river avulsion events.
  • Correlation of avulsion locations with geomorphological features and hydrological conditions.

Main Results:

  • Three distinct controls on avulsion location were identified: valley confinement changes on fans, and flow dynamics (deceleration/acceleration) within the backwater zone on deltas.
  • A significant portion (38%) of delta avulsions occurred upstream of backwater zones, linked to steep, sediment-rich rivers in arid and tropical environments.
  • Upstream flood-driven erosion, extending beyond backwater effects in specific river types, dictates avulsion location in these cases.

Conclusions:

  • Avulsion locations are governed by a combination of geomorphological setting and flood dynamics.
  • Steep, sediment-rich rivers exhibit unique avulsion behavior extending beyond typical backwater influences.
  • Findings provide critical insights into how river avulsion hazards may evolve with changing land use and climate.