What is the minimum size of the bed material that will remain at rest in a channel?

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The manning’s coefficient for a lined trapezoidal channel with a bed slope of 1 in 4000 is 0.014 and it will be 0.028 if the channel is unlined. The area in the case of the lined section is 19.04 m^2 and for the unlined section is 29.09 m^2. What percentage of earthwork is saved in a lined section relative to an unlined section, when a hydraulically efficient section is used in both the cases?

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

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Calculate the ratio of the tractive critical stress to the average shear stress if the water flows at a depth of 0.8 m in a wide stream having a bed slope of 1 in 3000. The median diameter of the sand bed is 2 mm.

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

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Calculate the Manning’s rugosity coefficient in a coarse alluvium gravel with D-75 size of 5 cm.

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Calculate the critical tractive stress if the median diameter of the sand bed is 1.0 mm.

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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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Whose theory was the first to provide semi-theoretical analysis of the problem of incipient condition of bed motion?

asked Jul 29, 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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What is the limitation of the Shield’s expression?

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

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For the design of non-scouring channels in coarse alluviums, the shield’s entrainment function should be ____________

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

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Which one is the correct expression for Shield’s entrainment function?

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

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Strickler’s formula is only applicable to the flexible boundary channels.

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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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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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A part of tractive force does not have any part in transporting the bed material, i. e bed load.

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

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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.

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

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Which of the following statement is wrong? (a)Ripples do not occur if the size of the bed particles is coarser than 0.6 mm

asked Jul 31, 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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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.

asked Aug 25, 2023 in Irrigation Engineering by Carter (75.2k points)

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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.

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

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According to Lacey what factor is needed to have a true regime in an artificial channel?

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

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Based on his research what factor is given by Kennedy for free silting and scouring actions in a channel?

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

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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.

asked Sep 16, 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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