The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by______________?

A. 4rs
B. 11 rs
C. 7rs
D. 15 rs

Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be_________?

A. 19 m
B. 38m
C. 57m
D. 76m

For a proportional outlet, the flexibility is______________?

A. Zero
B. Between zero and 1
C. 1
D. Greater than 1

If the critical shear stress of a channel is xc, then the average value of shear stress required to move the grain on the bank is___________________?

A. 0.5 xc
B. 0.75 tc
C. Xc
D. 1.33 tc

Which of the following is a flexible outlet ?

A. Submerged pipe outlet
B. Kennedy’s gauge outlet
C. Gibb’s outlet
D. None of the above

Which of the following types of falls use parabolic glacis for energy dissipation ?

A. Vertical drop fall
B. Glacis fall
C. Montague type fall
D. Inglis fall

Which of the following can be used as a meter fall ?

A. Vertical drop fall
B. Flumed glacis fall
C. Unflumed glacis fall
D. All of the above

Which of the following canal outlets maintains a constant discharge ?

A. Non-modular outlet
B. Flexible outlet
C. Rigid module
D. None of the above

The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in___________________?

A. Aqueduct and syphon aqueduct
B. Aqueduct and super passage
C. Super passage and canal syphon
D. Level crossing

The aqueduct or superpassage type of works are generally used when_______________?

A. High flood drainage discharge is small
B. High flood drainage discharge is large and short lived
C. High flood drainage discharge is large and continues for a long time
D. None of the above