Question: What Are The 3 Zones Of Groundwater?

What are the zones of groundwater?

Groundwater is found in two zones.

The unsaturated zone, immediately below the land surface, contains water and air in the open spaces, or pores.

The saturated zone, a zone in which all the pores and rock fractures are filled with water, underlies the unsaturated zone..

What is the level of underground water at a place?

The upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where in general all pore spaces are saturated with water, is the phreatic zone. Substrate with low porosity that permits limited transmission of groundwater is known as an aquitard.

Where does groundwater go?

Groundwater discharges into lakes, streams, and wetlands. This usually occurs as underground seepage. However, you may have seen a spring before, such as in the picture below.

What happens after groundwater?

Groundwater and surface water are connected. When groundwater is overused, the lakes, streams, and rivers connected to groundwater can also have their supply diminished. Land subsidence occurs when there is a loss of support below ground.

Which is the saturated zone?

The saturated zone encompasses the area below ground in which all interconnected openings within the geologic medium are completely filled with water . Unlike the phreatic zone, however, the capillary action causes the water in the pores to have a pressure that is lower than atmospheric pressure. …

Is groundwater drinkable?

Most of the time, U.S. groundwater is safe to use. However, groundwater sources can become contaminated with germs, such as bacteria, viruses, and parasites, and chemicals, such as those used in fertilizers and pesticides. … More often, however, human activities contaminate ground water.

Where is the vadose zone?

The vadose zone, also termed the unsaturated zone, extends from the top of the ground surface to the water table. The word Vadose means “shallow” in Latin.

How do I find my water table?

The most reliable method of obtaining the depth to the water table at any given time is to measure the water level in a shallow well with a tape. If no wells are available, surface geophysical methods can sometimes be used, depending on surface accessibility for placing electric or acoustic probes.

Is groundwater always fresh?

The world’s supply of fresh water is made up of lakes, rivers, etc. (0.4 percent); snow and ice (68.7 percent); and groundwater (30.9 percent).

How do I know if my water table is seasonal high?

Under current standards DEM (2008) defines the seasonal high water table (SHWT) as “the elevation of the groundwater table during that time of the year at which it is highest as determined by direct observation or by interpretation of hydromorphic features in the soil profile”.

What is zone of saturation in groundwater?

The term groundwater refers to all water which is below the surface of the ground in the saturated zone and which is in direct contact with the ground or subsoil. The saturated zone is where all the cracks in the rock and all the spaces between the grains of rock or within the soil are filled with water.

What is the process of groundwater?

Recharge occurs when surface water, either from direct precipitation or from rivers and lakes, percolates downwards through the microscopic spaces in the soil and rock profile. Eventually, the infiltrated water may make its way into an underground water-bearing rock formation, known as an aquifer.

What is the main source of groundwater?

precipitationThe main (and frequently only) source of groundwater is precipitation. Water falling on the surface is absorbed into the ground and slowly filters…

How do I find the elevation of my water table?

water-table elevation = land-surface elevation – depth to water below land surface (elevations are in feet NAVD 88; depth is in feet).