Hydraulic head
Hydraulic head
Hydraulic head is a specific measurement of liquid pressure above a geodetic datum. It is usually measured as a liquid surface elevation, expressed in units of length, at the entrance of a piezometer. Hydraulic head is a key concept in hydrology, hydraulics, and civil engineering, particularly in the study of groundwater flow and the design of water supply systems.
Definition[edit]
Hydraulic head is defined as the height of a liquid column that corresponds to the pressure exerted by the liquid at a given point. It is a measure of the potential energy available to drive the flow of water in a hydraulic system. The hydraulic head (h) at a point in a fluid is given by the equation:
- h = z + \frac{p}{\gamma}
where:
- z = elevation head (height above a reference datum)
- p = pressure head (pressure at the point)
- \gamma = specific weight of the fluid
Components[edit]
Hydraulic head consists of two main components:
- Elevation head: The height of the point above a reference level, usually mean sea level.
- Pressure head: The height of a fluid column that would produce the pressure exerted by the fluid at the point of measurement.
Applications[edit]
Hydraulic head is used in various fields, including:
- Groundwater hydrology: To determine the direction and rate of groundwater flow.
- Hydraulic engineering: For the design and analysis of dams, levees, and canals.
- Environmental engineering: To assess the movement of contaminants in groundwater.
Measurement[edit]
Hydraulic head is typically measured using a piezometer, which is a device that measures the pressure head of groundwater at a specific point. The elevation head is determined by the height of the piezometer above a reference datum.
Related Concepts[edit]
- Hydraulic gradient: The slope of the hydraulic head in a given direction, which drives the flow of water.
- Darcy's law: A fundamental equation that describes the flow of a fluid through a porous medium, which is driven by the hydraulic gradient.
- Aquifer: A geological formation that can store and transmit groundwater, characterized by its hydraulic head distribution.
See Also[edit]
References[edit]
External Links[edit]
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