Question Bank • QB_EXP_IDE_HGT_003
MSQ • 2 Marks
Section 5: Irrigation and Drainage Engineering
Subsurface Drainage: Hooghoudt & Steady-State Equations
Subtopic: Steady vs unsteady subsurface drainage
Question Statement:
Which of the following equations is/are applicable to agricultural subsurface drainage calculations?
Options:
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(A) Hooghoudt equation (steady-state water table under uniform steady recharge)
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(B) Ernst equation (steady-state multi-layered soil profile with vertical, horizontal, and radial resistance)
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(C) Glover-Dumm equation (transient / unsteady water table drawdown following an instantaneous recharge)
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(D) Navier-Stokes equation for boundary layer separation on aerofoils
Step-by-Step Solution & Explanation
1. Hooghoudt is the primary international steady-state drainage equation (A).
2. Ernst equation solves two-layered stratified soils separating $W, H, R$ head losses (B).
3. Glover-Dumm solves the linearized 1D Boussinesq unsteady drawdown equation (C).
4. Aerofoil boundary layer dynamics is external aerodynamics, irrelevant to porous media drainage (D is false).
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