Subtopic: Steady and unsteady flow in confined and unconfined aquifers
Question Statement:
The following data were collected from two piezometers P and Q located adjacent to each other in a groundwater basin. R.L. of the ground surface (m): P=220, Q=220. Depth of piezometer (m): P=120, Q=90. Depth to groundwater level from ground surface (m): P=60, Q=50. Hydraulic gradient between the piezometers is
Options:
(A) 0.33
(B) 3.00
(C) 0.94
(D) 1.06
Official Answer Key:
A
Step-by-Step Solution & Explanation
Head difference between P and Q = 170−160 = 10 m. With the piezometers set at different depths (120 m and 90 m), the flow-path (vertical) separation between their intake points is taken as the difference in piezometer depths = 120−90 = 30 m. Hydraulic gradient = Δh/ΔL = 10/30 = 0.33.
Section 6 — Agricultural Process Engineering
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