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Related Concept Videos

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...
Underflow Gates01:30

Underflow Gates

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 Drowned...
The Water Cycle01:00

The Water Cycle

The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

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Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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Plane Potential Flows

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Uniform Flow
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Related Experiment Video

Updated: May 14, 2026

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
08:09

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management

Published on: September 12, 2017

Global patterns of groundwater table depth.

Y Fan1, H Li, G Miguez-Macho

  • 1Department of Earth and Planetary Sciences, Rutgers University, New Brunswick, NJ 08854, USA. yingfan@rci.rutgers.edu

Science (New York, N.Y.)
|February 23, 2013
PubMed
Summary
This summary is machine-generated.

Shallow groundwater is vital for global land ecosystems, supporting 22-32% of land area. Understanding water table depth is key to ecosystem health and water resource management.

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Published on: May 1, 2018

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
06:37

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds

Published on: November 13, 2017

Related Experiment Videos

Last Updated: May 14, 2026

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
08:09

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management

Published on: September 12, 2017

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

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Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
06:37

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds

Published on: November 13, 2017

Area of Science:

  • Earth Science
  • Ecology
  • Hydrology

Background:

  • Shallow groundwater sustains terrestrial ecosystems by maintaining river base-flow and root-zone soil moisture.
  • Global patterns of water table depth and its ecological significance remain poorly understood.

Purpose of the Study:

  • To map global water table depth patterns.
  • To identify areas where shallow groundwater critically supports land ecosystems.

Main Methods:

  • Compiled global water table depth observations from government archives and literature.
  • Utilized a groundwater model driven by climate, terrain, and sea level data to infer patterns and fill data gaps.

Main Results:

  • Shallow groundwater influences 22-32% of global land area.
  • Approximately 15% of land features groundwater-fed surface water, while 7-17% has the water table within plant rooting depths.
  • Water table depth patterns correlate with global wetland distribution and regional/local vegetation gradients.

Conclusions:

  • Shallow groundwater plays a crucial role in supporting global terrestrial ecosystems.
  • Mapping water table depth is essential for understanding ecosystem function and water resource availability.