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
Related Mcqs:
- Tortuosity of a meandering river is the ratio of__________________?
A. meander belt to meander length
B. meander length to meander belt
C. curved length along the channel to the direct axial length of the river reach
D. direct axial length of the river reach to curved length along the channel - Main purpose of mean water training for rivers is________________?
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 - Unit of runoff in M.K.S. system is________________?
A. cubic metre/sec
B. metre/sec
C. cubic metre
D. square metre - 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 - For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is________________?
A. N/(m+l)
B. m/(N+l)
C. m/N
D. (N+l)/m - In case of non-availability of space due to topography, the most suitable spillway is________________?
A. straight drop spillway
B. shaft spillway
C. chute spillway
D. ogee spillway - The best unit duration of storm for a unit hydrograph is________________?
A. 1 hour
B. one-fourth of basin lag
C. one-half of basin lag
D. equal to basin lag - 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 - 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
