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What is the upper boundary of the saturated zone in an aquifer called?

Answer and explanation

Correct answer: Groundwater level or water table

Correct answer: B, the water table. An aquifer is a permeable underground layer that can store and transmit groundwater. Below the water table, the connected pores and cracks are generally filled with water; this is called the saturated zone. Above it, pores contain a mixture of air and water and belong to the unsaturated or vadose zone. The boundary between these two zones is called the water table, or groundwater level. Its position can rise after substantial recharge from rainfall and fall when pumping, natural discharge, or drought removes more water than enters. A, the aquifer base, is the lower boundary or underlying confining material, not the upper surface of saturation. C, infiltration line, is not the standard name for this boundary; infiltration describes water entering soil. D, runoff crest is not an aquifer term and refers neither to groundwater saturation nor to its upper limit. Memory cue: “table” is the top level of groundwater, while the saturated water lies below it.

Related tags

AquiferWater TableSaturated ZoneGroundwaterHydrological CycleThe Living WorldBiologyClass 11 Mcq

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