Lacey's equation for calculating flood discharge in rivers, is V = 10.8 R1/2 S1/

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Question
Lacey's equation for calculating flood discharge in rivers, is
Options
A. V = 10.8 R^1/2 S^1/2
B. V = 10.8 R^2/3 S^1/2
C. V = 10.8 R^2/3 S^1/3
D. V = 10.8 R^1/3 S^2/3

Correct Answer

V = 10.8 R^2/3 S^1/3

Irrigation problems

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3. According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
Options
A. 1.25 D
B. 1.50 D
C. 1.75 D
D. 2.00 D

7. Which one of the following statements is correct?
Options
A. The canal system and the drainage system are complementary
B. The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land
C. The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
D. All the above.

9. In case of a trapezoidal notch fall
Options
A. top width of the notch is kept between 3/4 th of full water depth above the sill of the notch
B. top length of the piers should not be less than their thickness
C. splay up stream from the notch section is 45�
D. splay down stream from the notch section is
E. all the above.

10. A counter berm is
Options
A. a horizontal benching provided on the inside slope
B. a horizontal benching provided on the outside slope
C. a vertical benching provided on the outer edge of the bank
D. a vertical benching provided on the inner edge of the bank.

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