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John1397
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Fill a bath tub with six inches of water is the water completely flat or level on top?
John
John
John1397 said:Fill a bath tub with six inches of water is the water completely flat or level on top?
John
what do you mean by "flat or level" at this scale?
What exactly does "level" mean on scales where tidal forces are significant?
John1397 said:I was thinking in terms of surveying
bahamagreen said:Wikipedia says, "A megagon is a polygon with 1 million sides...for a circle the size of the Earth, with a circumference of 40,075 kilometers, the difference between the perimeter of the megagon and the circumference of the circle comes to less than 1/16 millimeters."
That total difference of 1/16mm (0.0625mm) is distributed across one million sides of length 40.075m each.
So each 40.075m length has an individual contribution to the total error of 0.0000000625mm.
If your bath tub water surface is on the order of 1m, that's 40 times smaller, so a flat tub water surface would deviate from curved the amount corresponding to whatever the 40 million side polygon would be called, with an individual side's part of the error being 0.0000000016mm, or 1.6^-9mm.
Water surface level refers to the height or elevation of the surface of a body of water, such as a lake, river, or ocean.
Water surface level is typically measured using a device called a water level gauge or staff gauge. This device consists of a graduated scale attached to a vertical post that is installed near the water's edge. The water level can be determined by reading the scale at the point where it intersects with the water's surface.
Several factors can affect water surface level, including precipitation, evaporation, inflow and outflow of water, tides, and human activities such as damming or diversion of water.
Monitoring water surface level is important for several reasons. It can help predict and prevent flooding, assess the health of aquatic ecosystems, and guide water management decisions such as determining water allocations for agriculture or other purposes.
Scientists use water surface level data to study and understand the dynamics of water bodies, including changes in water level over time. This data is also used to create models and make predictions about future water levels, which can inform management and conservation efforts.