What is the main difference in the procedure required for obtaining a sample of groundwater from below the groundwater table and from above the water table in a monitoring well?
What is the main difference in the procedure required for obtaining a sample of groundwater from below the groundwater table and from above the water table in a monitoring well?
Groundwater is water that is placed beneath the surface of the Earth. Groundwater started as precipitation and therefore, the portion of the rain water that infiltrates beneath the ground's surface, either naturally or artificially, becomes groundwater. The remaining portion of the precipitation is used by plants, evaporates, or becomes surface water runoff which can either add to groundwater levels in other areas or be increased by groundwater outflows depending on the geology the surface water travels through. The amount of precipitation that gets absorbed and becomes groundwater depends on the soil type. Highly porous soils, such as sandy soils, absorb water much faster than soil such as clay which has very small pores. The saturated soil acts like a sponge and the area where groundwater is present, or saturated, in the soil is called an aquifer, which generally has a boundary defined as its basin. Groundwater basins are formed naturally over a period ranging from several years to more than a millennium in some geologies.
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