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AQUIFER-Rock formation/its derivatives where ground water occurs and move but invisible WATERSHED-it is a land surface unit where we alllive and surface water occurs& is visible
AQUIFER-Rock formation/its derivatives where ground water occurs and move but invisible WATERSHED-it is a land surface unit where we alllive and surface water occurs& is visible
Land-surface datum is a datum plane that is approximately at land surface at each well. If known, the elevation of the land-surface datum above sea level is given... Datum: any level surface, line, or point used as a reference in measuring elevations.
A watershed is an area land from which water ultimately drains into a major river, which then dumps into the ocean or sea. A water table is the level below which the ground is saturated with water.
Since the water table is just a level of ground that holds water, much of the content of the water table is water. When the water is gone, the water table shrinks, and the land moves downwards.
wetland
wetland
A Marsh
Marsh
A marsh
Increase.
Yes and no. Liquifaction usually only happens when land is in a low lying area which is either susceptible to flooding or used to be a swamp etc. This means the water level under the ground is quite near the surface. Therefore in an earthquake the ground shaking - sort of shakes up the water to the surface and it spills out overland. You can do the same thing with a bowl of thick mud. if you bang and shake the bowl the water in the mud will come to the surface - liquifaction. After a while it will sink back into the ground, but the drying out causes land to sink and rise.
If the water table is higher the the surface of the land, water will seep out of the land surface and form a puddle, pool or lake. The depth of the water body will increase until the water surface is at the same level as the surrounding water table - this is a state of equilibrium. If the water table lowers, so will the water level in the water body, until equilibrium is reached. Water moves slowly into and out of the land surface and follows the movement of the water table in the area. Don't confuse this with storage reservoirs behind dams. These have an artificially high water level and the surrounding water table can be lower than the reservoir.
1. Seepage from the ground 2. Runoff from the surface
1. Seepage from the ground 2. Runoff from the surface
The sun more quickly heats the surface of the land during the daytime than that of the water. The reason for this is that the surface of the water has a much higher effective heat capacity (amount of temperature change for a given unit of heat imparted) than land. This contrast in surface temperatures causes the air column over land to expand, consequently an upper level pressure gradient to develop (high over land at altitude vs low over the water) and flow at altitude from land to ocean. This movement of air out of the land air column and towards the water air column causes a surface pressure gradient to develop, with a surface level high pressure over water and a surface level low over the land. This gradient drives the daytime "see breeze" flow of surface level air from the water to the land. It's actually part of a cell that develops that can be thought of as a roll laying parallel to the shore, going up over land, out to sea at height, down over the sea, and towards land at the surface.
One of the factors that determine whether water infiltrates is the nature of the surface. Another factor that determines is the elevation of the surface or its shape.