The answer to that question is " Piezometric plane". Though in reality the correct definition of Piezometric plane is actually "The equivalent elevation head (EH) of water at the point force is measured", what they are talking about when they say "equivalent" is that imaginary line.
The imaginary line that divides the Earth into the northern hemisphere and the southern hemisphere is called the equator. It is an imaginary line located at 0 degrees latitude and circles the Earth, dividing it into two equal halves. It is used as a reference point for navigation and to determine climatic zones.
Longitude is the angle east or west from the reference line to your location. Latitude is the angle north or south from the reference line to your location.
The height of the lands surface above sea level
A meridian is a line of constant longitude.
An imaginary line (one of the anatomical reference axes) running down the centre of the body perpendicular to the transverse plane, around which rotations in the transverse plane (e.g. a body spin during a pirouette) occur.
Earth's surface is a common reference point for determining position and motion.
Sea level is 0 feet, period - that's the reference used for determining land elevation. Sea level is the same in Hawaii as it is in Siberia or anywhere else.
BM in surveying stands for "Bench Mark." It is a point of known elevation used as a reference for conducting leveling surveys. Bench Marks are typically physical markers installed in the ground or on a structure that serve as a consistent point of reference for determining elevations.
reference point
Elevation is how high something is. Ex: The mountain has an elevation of about 600 ft.
Sea level ~ average (mean) height of the sea, with a reference to a suitable reference point. Elevation ~ height of a geographic location above mean sea level.
It is a reference elevation in feet above sea level. A Benchmark (with a capital B) is an elevation marker established by the Federal Governement (USGS)for the use by land surveyors.
Elevation. "The elevation of a geographic location is its height above a fixed reference point, often the mean sea level."
The geographical term for heights is elevation. Elevation is the vertical distance of a location above a reference point, such as sea level.
It is a fixed reference point whose elevation above a given datum line
a topographic map of the area
Elevation. "The elevation of a geographic location is its height above a fixed reference point, often the mean sea level."