Q. 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.

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Q. At a certain place, the transplantation of a crop takes 15 days, and the total depth of water required by the crop is 90 cm on the field. During the plantation rain falls and about 20 cm is utilised to fulfil the demand. Now determine the duty of irrigation water required during the plantation.

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Q. Let us take the gross commanded area of a watercourse is 2000 hectares, 80% of which is culturable irrigable. Intensities of sugarcane and paddy are 30% and 50%. The duties of the crops at the head of the watercourse are 850 hectares/cumec and 1900 hectares/cumec. Find the discharge required at the head of the watercourse?

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Q. We can find out monthly or fortnightly water requirements of various crops using intervals.

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Q. By how much percentage canal capacity is increased to meet peak demands?

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Q. Suppose the culturable commanded for a distributary is 8000 hectares, and the intensity of irrigation for Kharif season is 60% and that of rabi season is 30%. The average duty at the head of a distributary is 4000 hectares/cumec for Kharif season and for Rabi season it is 1800 hectares/cumec, find out discharge required at the head of the distributary?

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Q. Determine the discharge required at the head of the distributary in a canal where Kharif area to be irrigated is 2400 hectares and Rabi area to be irrigated is 1800 hectares, for fulfilling maximum crop requirement. Assume suitable values for kor depth and kor period.

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

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

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

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

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

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Q. What is the limitation of the Shield’s expression?

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

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Q. 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 m² and for the unlined section is 29.09 m². 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?

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

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Q. 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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Q. 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/m². 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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Q. 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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Q. Design of alluvial channels in India is based on Kennedy and Lacey theories.

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