The Dupuit''s assumptions in groundwater flow through unconfined aquifer include:
Choose the correct answer
Flow is vertical only
Flow is essentially horizontal; hydraulic gradient = slope of water table; velocity uniform over depth
Aquifer is confined (artesian)
Flow is always turbulent
Correct Answer
B. Flow is essentially horizontal; hydraulic gradient = slope of water table; velocity uniform over depth
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Dupuit (1863) assumptions for unconfined flow: (1) Flow is essentially horizontal (hydraulic gradient = slope of water table, not actual slope); (2) Velocity uniform over the aquifer depth; (3) Free surface slope is small. Gives Dupuit-Forchheimer equation: q = kh(dh/dx) per unit width. Valid when water table slope < 1:10.
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