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GATE 2020 CE (CE2) – Question 23

Irrigation · Canals, design of weirs on permeable foundation, cross drainage structures · 1 mark · Multiple choice

A superpassage is a cross-drainage structure in which ______.

  1. natural stream water flows with free surface below a canal
  2. natural stream water flows under pressure below a canal
  3. canal water flows with free surface below a natural stream
  4. canal water flows under pressure below a natural stream

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Show answer and explanation

Correct answer: (C) canal water flows with free surface below a natural stream

Explanation

In a superpassage,the natural drainage channel crosses above the canal,and the canal continues underneath with a free surface. **Answer:C**. A canal carrying pressure flow below the drainage would be a canal siphon.