As per Lacey’s theory, the silt factor is_________________?
(A) directly proportional to average par¬ticle size
(B) inversely proportional to average par¬ticle size
(C) directly proportional to square root of average particle size
(D) not related to average particle size
The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is________________?
(A) less than 1
(B) equal to 1
(C) greater than 1
(D) equal to zero
As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at_____________?
(A) lower level
(B) higher level
(C) same level
(D) any of the above depending on the design
The main function of a divide wall is to_______________?
(A) control the silt entry in the canal
(B) prevent river floods from entering the canal
(C) separate the undersluices from weir proper
(D) provide smooth flow at sufficiently low velocity
If there are two canals taking off from each flank of a river, then there will be____________________?
(A) one divide wall and one undersluice
(B) one divide wall and two undersluices
(C) two divide walls and one undersluice
(D) two divide walls and two undersluices
In a chute spillway, the flow is usually____________________?
(A) uniform
(B) subcritical
(C) critical
(D) super critical
A land is known as waterlogged_________________?
(A) when the permanent wilting point is reached
(B) when gravity drainage has ceased
(C) capillary fringe reaches the root zone of plants
(D) none of the above
A repelling groyne is aligned________________?
(A) pointing upstream
(B) pointing downstream
(C) perpendicular to bank
(D) parallel to bank
If D is the depth of scour below original bed, then the width of launching apron is generally taken as________________?
(A) 1.2 D
(B) 1.5 D
(C) 2.0 D
(D) 2.5 D
River training for depth is achieved by_______________?
(A) groynes
(B) construction of dykes or leavees
(C) both (A) and (B)
(D) groynes and bandalling