Subtopic: Steady and unsteady flow in confined and unconfined aquifers
Question Statement:
An imaginary surface obtained by joining the water levels in several observation wells driven in a confined aquifer is known as
Options:
(A) Phreatic surface
(B) Piezometric surface
(C) Capillary fringe
(D) Water table
Official Answer Key:
B
Step-by-Step Solution & Explanation
In a confined aquifer, water is under pressure beneath a confining layer; the level to which water rises in an observation well tapping that aquifer defines the piezometric (potentiometric) surface — an imaginary surface joining these water levels. The water table (D) and phreatic surface (A) refer to the free surface of an *unconfined* aquifer, not a confined one; capillary fringe (C) is the zone of capillary rise just above the water table. Answer: (B).
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