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

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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.

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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°.

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

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

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

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.

asked Jul 29, 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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Calculate the Manning’s rugosity coefficient in a coarse alluvium gravel with D-75 size of 5 cm.

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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On increasing velocity beyond the threshold stage of motion, the bed develops ____________ shape.

asked Jul 31, 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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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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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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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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For the bed of the canal, the average shear stress is equal to the tractive force per unit area.

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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What is the problem in India for artificial channels?

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

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A pump was installed in a field to supply water to the crops. The duty for this crop is 432 hectares/cumec on the field and the efficiency of pump is 50%. The sown area of the field is 5 hectares. Determine the maximum output required (H.P) of the pump, if the highest water level is 4 meters below the highest portion of the field. Assume negligible field channel losses.

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

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Design a regime channel for a discharge of 90 cumecs and silt factor is 1.3 use Lacey’s Theory.

asked Aug 25, 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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What is the condition for digging of borrow pits?

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