The height of water above any plane or point of references (The energy possessed by each unit of weight of a liquid, expressed as the vertical height through which a unit of weight would have to fall to release the average energy posed.) Standard unit of measure shall be the foot. Head in feet for water at 68?/font F is 1 psi = 2.310 ft.
(1) A measure of the energy possessed by water at a given location in the water system, expressed in feet. (2) A measure of the pressure or force exerted by water, expressed in feet.
In hydrologic terms, the difference between the pool height and tailwater height. Usually expressed in feet of head, or in lbs./sq. inch
A measure of the pressure at a given point in a water system, expressed as pounds per square inch (psi), or the height of a column of water that would produce the pressure.
(1) The height of the free surface of fluid above any point in a hydraulic system; a measure of the pressure or force exerted by the fluid on a given area. (2) The energy, either kinetic or potential, possessed by each unit weight of a liquid, expressed as the vertical height through which a unit weight would have to fall to release the average energy possessed. It is used in various compound terms such as pressure head, velocity head and loss of head. (3) The upper end of anything, as headworks. (4) The source of anything, as headwater. (5) A comparatively high promontory with either a cliff or steep face extending into a large body of water, such as a sea or lake. An unnamed head is usually called a headland. Also hydraulic head.
The difference between the pool height and tailwater height, expressed in a height or in a force per area.
Another method of calculating pressure in feet of head instead of psi (one foot of head equals 0.433 psi).
First-kind boundary condition for flow: hydraulic head (unit [m]).
The height of the surface of water above a specific point - used as a measurement of pressure.
Gains or losses in pressure caused by gravity and friction as water moves through a system. It can be measured in lbs. per square inch (PSI) or feet of water. A pump must produce 1 PSI to push a column of water vertically 2.31 feet. Use the following formulas to convert: Max. pressure x 2.31 = Max. Head Rating Max. Head Rating ÷ 2.31 = Max. Pressure
Hydraulic head is defined as the sum of the pressure head and the elevation. Pressure head is, in turn, defined as p/( g), where p is the fluid pressure, is the fluid density, and g is the acceleration of gravity.
The difference in elevation between the reservoir water surface and the power generating turbines at a powerplant which is connected to a reservoir.
(1) See Bulkhead, Tank. (2) Also terminology for pressure of a liquid caused by its own weight.
Is another word for Pressure.
(1) A comparatively high PROMONTORY with either a CLIFF or steep face. It extends into a large body of water, such as a SEA or lake. An unnamed HEAD is usually called a headland. (2) The section of RIP CURRENT which has widened out seaward of the BREAKERS, also called head of rip.
A measure of the pressure at a point in a water system, expressed in pounds per square inch, or in the height of a column of water which would produce the pressure. 1 psi equals 2.31 feet of head (water).
A measure of pumping pressure. 10 metres head = 1 Bar at 20°C More information
The difference in the depth of water at any two points, or the measure of the pressure at the lower point expressed in terms of this difference.
term used to describe the height of falling water in a hydropower system.
The height from the inlet of the pipe for a micro-hydro system to the outlet (which may be at the turbine or at the tail water level - depending on the type of turbine used). The head is important in determining what the output of the micro-hydro system will be.
The height above a standard datum of the surface of a column of water (or other liquid) that can be supported by the static pressure at a given point.
The hydrostatic pressure generated by water in a reservoir.
Shortened form of the phrase "pressure head", referring to the pressure resulting from a column of water or elevated supply of water.
the height of a column of fluid equal to a pressure
A comparatively high promontory of land projecting into the sea with a steep face. An un-named head is usually described as a `Headland' when a specific name is assigned, it becomes a `Head'.
Another term for pressure, usually referring to gas or liquid.
The vertical distance between a pump and water outlet, used to determine pump performance. Pumps are sized by how much water (in gallons per hour) they can deliver at different head heights above the water level of the pond.
The water pressure exerted by gravity (2.31 feet of height means/delivers one pound of head). Also, slang for toilet.
The vertical height of the water in a reservoir above the turbine. In general, the higher the head, the greater the capability to generate electricity.
Energy contained in a water mass; expressed in elevation (feet) or pressure (pounds per square feet).
The difference in elevation between the headwater surface above and the tailwater surface below a hydroelectric powerplant under specified conditions.
The pressure of water (or steam) in a closed system (see Pressure Head). It represents the differential in the gravitational force exerted by a liquid at two different depths. Nautical slang term for toilet
Height of the column of water at a given point in a groundwater system above a datum plane such as mean sea level. It is also a measure of pressure as in a confined aquifer where the elevation of the groundwater does not equal its head because it is under pressure.
The equivalent height of the liquid. 20° C. water is used as the standard where 10 meters (33.9 ft.) of water equals one atmosphere (14.7 psi. or 1 bar). The term head is used instead of pressure in the centrifugal pump business.
is a term that normally refers to the height in feet that the concrete grout is above the tip of the auger discharge bit as it is being withdrawn from the hole. While this can't be measured because it is below the ground it is normally estimated by observing height the grout on the auger after it is totally withdrawn from the hole.
A unit of pressure for a fluid, commonly used in water pumping and hydropower to express height a pump must lift water, or the distance water falls. Total head accounts for friction head losses, etc.
The total vertical distance between the beginning of a hydro system diversion and the micro hydro turbine. The amount of power a turbine produces is proportional to the total available head. See also: Francis Turbine, Impulse Turbine, Penstock, Propeller Turbine, Reaction Turbine, Static Pressure, Suction Head
The difference in number of feet between two water surface elevations. Height of water above a specified point.
A measure of pressure, expressed in feet of head for centrifugal pumps. Indicates the height of a column of water being moved by the pump (without friction losses).
The measure of pressure indicating the height of a column of system fluid that has an equivalent amount of potential energy.
The product of the water's weight and a usable difference in elevation gives a measurement of the potential energy possessed by water.
The mechanical energy per unit weight. It is the total pressure of a fluid expressed as a vertical distance.
Specific energy or energy per unit weight of fluid, the unit of head is a distance in feet or meters.
The difference in elevation between two water surfaces, measured in metres or feet. Gross head: The vertical drop between the intake of a pipeline (penstock) and the outlet (location of turbine).
A term used to define water pressure in vertical feet. Or a term representing the energy content of a liquid, expressed as the height of an equivalent vertical column of water. a. This is expressed in feet of head. b. This can apply to both sides of a pump; the suction side and discharge side. c. It is also used to express the total losses in a pumping system (Total Dynamic Head).
Often used to indicate gauge pressure, this is energy per pound produced by pressure, elevation or velocity. Expressed in linear units, it is the height of a column or body of fluid above a given point.
The measure of the pressure or force exerted by a fluid in a hydraulic system. Also, the height of fluid above any point, taking into account losses or gains in pressure due to gravity and friction as water travels through a system, measured in lbs per square inch (psi) or feet of water.
Measure of the potential energy of a fluid at any given point with respect to a given datum.
Represents an available force equivalent to a certain depth of water. This is the motivating force in effecting the movement of water. The height of water above any point or plane of reference. Used also in various compound expressions, such as energy head, entrance head, friction head, static head, pressure head, lost head, etc.
The potential energy per unit weight of fluid above a certain point. This point is usually the height of the free water level.
The distance that water falls in passing through a hydraulic structure or device such as a hydroelectric plant. Gross head is the difference between the headwater and tailwater levels; net head is the gross head minus hydraulic losses such as friction incurred as water passes through the structure; and rated head is the head at which the full-gate discharge of a turbine will produce the rated capacity of the connected generator.
(1) Pressure of liquid upon a unit area due to the height of the liquid column above the point at which the pressure is measured.(2) A single flow of a well when flowing intermittently.
A measurement of pressure typically expressed in feet/head or lb/in2.
A measure of the amount of pressure or resistance in a hydraulic system. Resistance may include both the vertical distance and the amount of friction in a system and is measured in pounds per square inch (psi) or inches of mercury.
A measure of water pressure in m or bar or psi or Kpa.
The differential or pressure, usually expressed in terms of the height of a liquid column that the pressure will support. Also, the differential across a primary measuring device in feet of flowing fluid.
The pressure at any given point in a water system, generally expressed in pounds per square inch (psi).
The pressure exerted by a column of fluid, such as molten metal, water, etc.
(1) The elevation of the water table above a reference horizon; (2) the edge of ice at the origin of a glacier.
The energy of fluid per weight units; dimensionally expressed as length unit, for example, Newton × meters/Newton = meters.
The end caps on a cylindrically shaped Pressure vessel are commonly known as heads.