When a canal flowing under pressure is carried below a natural drainage such tha

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Question
When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called
Options
A. syphon
B. aqueduct
C. super passage
D. syphon-aqueduct.

Correct Answer

super passage

Irrigation problems

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1. Pick up the incorrect statement from the following
Options
A. Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
B. Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary
C. Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
D. None of these.

4. Water-shed line is abondened for aligning an irrigation canal if
Options
A. water shed forms a sharp loop
B. canal has to take off from a river
C. towns and villages are located on the water shed line
D. all the above.

7. The discharge over a trapezoidal crest of a Sarda fall with free over fall conditions, is
Options
A. 0.45 2g . LH^3/2 (H/B)^1/3
B. 0.45 2g . LH^2/3 (H/B)^2/3
C. 0.45 2g . LH^3/2 (H/B)^1/6
D. 0.45 2g . LH^1/6 (H/B)^3/2

8. A water-logged land is found suitable for cultivation due to
Options
A. ease of tillage for preparation of the field for optimum condition of germination
B. absence of aeration of soil from root zone of the plant
C. regular supply of water to plants from the water table by capillary action
D. none of these.

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