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Which of the following type of tank weirs are provided with a number of vertical steps instead of horizontal or sloping downstream apron?

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in Irrigation Engineering by (75.2k points)
Which of the following type of tank weirs are provided with a number of vertical steps instead of horizontal or sloping downstream apron?

(a) Type A: Masonry weir with a vertical drop

(b) Type B: Rock-fill weirs with a sloping apron

(c) Type C: Masonry weirs with a glacis

(d) Type D: Combination of Type A and Type C

I have been asked this question in class test.

The doubt is from Tank or Surplus Escape Weirs Design in portion River Navigation & Tank Irrigation of Irrigation Engineering

1 Answer

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by (106k points)
Correct choice is (d) Type D: Combination of Type A and Type C

Easiest explanation: Weirs of Type-D are called as weirs with stepped aprons as they are provided with a number of vertical steps as in case of a stepped fall instead of providing a horizontal or sloping downstream apron. Type-A and Type-D weirs are the most widely adopted.

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