Q. What minimum value of shear stress is needed to move the sediment?

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Q. Design a channel carrying a 30 cumecs. The median grain diameter is taken as 0.5 mm. The bedload concentration is 60 p.p.m by weight. Use Lacey’s Regime perimeter and Meyer-peter’s formulas.

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Q. The scouring and silting on the river banks raise the flood levels for the particular discharge.

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Q. The phenomenon of sediment transport increases maintenance work and sometimes leads to huge economic loss.

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Q. Which of the following statement is wrong?

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Q. BEAST Stands for _______________

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Q. The soil is assumed to be coherent in the study of the mechanism of sediment transport.

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Q. The basic mechanism behind the phenomenon of sediment transport is ______________

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Q. Which of the following statement is wrong?

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Q. For the bed of the canal, the average shear stress is equal to the tractive force per unit area.

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Q. A wide unlined channel carrying silt-free water has a depth of 2.0 m. The maximum slope that can be given to a channel is 1 in 10,000. Calculate the maximum tractive stress permissible on the bed to prevent scouring.

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Q. The water flows at a depth of 0.6 m in a wide stream having a bed slope of 1 in 2500. The critical tractive stress is 0.53 N/m². Determine the motion of soil grains and the average shear stress.

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Q. Whose equation was the first on the rate of bed load transport?

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Q. Which of the following statement is not correct about Einstein’s theory?

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Q. If the width of a river increases, the discharge per unit width will decrease and therefore, sediment carrying capacity will increase.

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Q. Which of the following statement is not correct about sediment load phenomenon and its measurement?

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Q. The sediment confined along and above the bed up to a depth ‘2d’ (d being grain size) is treated as bed load.

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Q. In a wide stream, a suspended load sample taken at a height of 0.30 m from the bed. The stream is 5.0 m deep and has a bed slope of 1/4000. The bed material can be of uniform size. Estimate the shear friction velocity.

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Q. For the usual turbulent flow, calculate the critical shear stress if the mean diameter of the grain particle of bed material is 0.3 mm.

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Q. Calculate the corresponding hydraulic mean depth that would exist in the channel if the bed was unrippled. The rugosity coefficient in an unrippled channel is 0.015 and the rugosity coefficient actually observed by experiments on the rippled bed of channel is 0.020. Consider the value of hydraulic mean depth of the channel as 1.5 m.

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