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  • Question

  • Retrogression of the bed level of a river downstream a weir, occurs due to


  • Options
  • A. heavy impact of water
  • B. increase of the bed level
  • C. less percentage of silt
  • D. soft soil strata.

  • Correct Answer
  • less percentage of silt 

    • Irrigation problems

    Search Results

    • 1. The measure to remove water logging of land, is

    • Options
    • A. to reduce percolation from canals and water courses
    • B. to increase outflow from the ground water reservoir
    • C. both (a) and (b)
    • D. neither (a) nor (b)
      • Discuss
    • 2. Irrigation canals are generally aligned along

    • Options
    • A. ridge line
    • B. contour line
    • C. valley line
    • D. straight line.
      • Discuss
    • 3. The top soil of a water logged field becomes more alkaline and infertile if its pH value is

    • Options
    • A. 6
    • B. 8
    • C. 9
    • D. 10
    • E. 11
      • Discuss
    • 4. The crest level of a canal diversion head work, depends upon

    • Options
    • A. F.S.L. of the canal
    • B. discharge perimeters
    • C. pond level
    • D. all the above
    • E. none these.
      • Discuss
    • 5. Pick up the correct statement from the following

    • Options
    • A. Approach of the water line in a flumed channel section should not be steeper than
    • B. Departure of the water line from a flumed channel section should not be steeper than 30°
    • C. Approach of the water line should not be steeper than 30° and departure line not steeper than in a flumed channel section
    • D. Approach and departure of the water line in a flumed channel section, should not be steeper than
      • Discuss
    • 6. The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept

    • Options
    • A. 0.20 m
    • B. 1.20 m
    • C. 2.20 m
    • D. 3.20 m
    • E. 4.90 m
      • Discuss
    • 7. For a given discharge in a channel, Blench curves give the relationship between the loss of head (HL) and

    • Options
    • A. specific energy up-stream
    • B. specific energy down-stream
    • C. critical depth of water down-stream
    • D. depth of water down-stream
      • Discuss
    • 8. Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less

    • Options
    • A. populated area
    • B. alkaline area
    • C. forest area
    • D. fallow land.
      • Discuss
    • 9. The sinuosity of a meander is the ratio of

    • Options
    • A. meander length and the width of meander
    • B. meander length and half width of the river
    • C. curved length and the straight distance
    • D. none of these.
      • Discuss
    • 10. Pick up the correct statement from the following

    • Options
    • A. In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal
    • B. In a level crossing a regulator is provided across the drainage at its down-stream
    • C. In a level crossing, a cross regulator is provided on the canal below the crossing
    • D. All the above.
      • Discuss

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