Question Bank • QB_SWCE_EXP_045 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil and Water Erosion

Subtopic: Earthen dams

Question Statement:

The top flow line of saturated seepage within an earth dam without a rock toe filter is called the:

Options:

  • (A) Phreatic line (zero pore water pressure line)
  • (B) Equipotential base line
  • (C) Capillary fringe line
  • (D) Isochore line

Answer Key:

A

Step-by-Step Solution & Explanation

The phreatic line (or seepage line) is the upper-most streamline along which pore water pressure is atmospheric ($u = 0$). Below this line the soil is fully saturated under positive pressure.
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