A. flood control
B. to provide sufficient depth of water in navigable channels, during low water periods
C. to preserve the channel in good shape by efficient disposal of suspended and bed load
D. all of the above
Related Mcqs:
- The main cause of meandering is________________?
A. presence of an excessive bed slope in the river
B. degradation
C. the extra turbulence generated by the excess of river sediment during floods
D. none of the above - 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 - The most suitable chemical which can be applied to the water surface for reducing evaporation is________________?
A. methyl alcohol
B. ethyl alcohol
C. cetyl alcohol
D. butyl alcohol - When surface of transpiration is submerged under water, then potential evapotranspiration is________________?
A. much more than evapotranspiration
B. much less than evapotranspiration
C. equal to evapotranspiration
D. equal to or less than evapotranspi-ration - River training for depth is achieved by_______________?
A. groynes
B. construction of dykes or leavees
C. both (A) and (B)
D. groynes and bandalling - A river training work is generally required when the river is_______________?
A. aggrading type
B. degrading type
C. meandering type
D. both (A) and (B) - For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of_______________?
A. rabi or kharif
B. rabi and kharif or sugarcane
C. rabi and sugarcane or kharif and sugarcane
D. rabi or kharif or sugarcane - When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?
A. 0 and wH212
B. wH2/2and wH2/3
C. wH and 0
D. OandwIIwhere w is unit weight of water and H is the depth of water
- The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000) will be________________?
A. V2 Q m3/sec
B. 0.5 Q mVsec
C. 2 Q m3/sec
D. 4 Q m3/sec - The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as__________________?
A. water conveyance efficiency
B. water application efficiency
C. water use efficiency
D. none of the above
