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

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Calculate the effective unit tractive force that causes bed load transportation if the unit tractive force produced by the flowing water is 3.20 N/m^2. The Manning’s coefficient on an unrippled bed is 0.0108 and the actual observed value of Manning’s coefficient on ripped channels is 0.0222. Take the value of critical shear stress that is required to move the grain particle as 0.5 N/m^2.

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

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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/m^2. Determine the motion of soil grains and the average shear stress.

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

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The basic mechanism behind the phenomenon of sediment transport is ______________

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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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Which type of force is needed for suspension of suspended load in flowing water?

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Given that the bed slope of a channel is 1 in 2000 and the discharge is 60 cumecs. The depth of the channel is fixed and is given as 2 m. The tractive force needed for the movement of bedload is? Take critical velocity ratio as 1.1.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

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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.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

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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.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

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The shear stress required to move grain on the side slopes is less than the shear stress required to move the grain on the canal bed.

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Determine the shear stress required to move the single grain on the side slopes, if the critical shear stress required moving the similar grain on the horizontal bed is 2.91 N/m^2. Consider the angle of the side slope with the horizontal as 30° and the angle of repose of soil as 37°.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

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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.

asked Aug 19, 2023 in Irrigation Engineering by Carter (75.2k points)

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What cause is prime responsible for the heavy movement of water from main canal to branch canal?

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

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What type of force is completely responsible for the bedload movement?

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

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

asked Aug 19, 2023 in Irrigation Engineering by Carter (75.2k points)

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Calculate the quantity of bed load transport by using Meyer and Peter formula if the effective tractive force that causes bed load transportation is 2.5 N/m^2.

asked Aug 15, 2023 in Irrigation Engineering by Carter (75.2k points)

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Commonly the bed load is 10% of total suspended load.

asked Jul 31, 2023 in Irrigation Engineering by Carter (75.2k points)

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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.

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

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Which of the following statement is wrong? (a)Threshold condition is the one in which a few particles on the bed will just start moving

asked Jul 29, 2023 in Irrigation Engineering by Carter (75.2k points)

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

asked Aug 16, 2023 in Irrigation Engineering by Carter (75.2k points)

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