Irrigation Questions

• The consumptive use of water for a crop
• Lacy's regime condition is obtained if
• The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is
• For a standing crop, the consumptive use of water is equal to the depth of water
• The useful moisture of soil, is equal to its
• If the optimum depth of kor watering for a crop is 15.12 cm, the outlet factor for the crop for four week period in hectares per cumec, is
• A fall in a canal bed is generally provided, if
• If V0 is the critical velocity of a channel, its silt transporting power, according to Kennedy, is proportional to
• The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
• According to Khosla, the exist gradient of surface flow
• If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is
• In Montague type fall
• A hydraulic structure is designed to withstand
• Useful soil moisture for plant growth, is
• Solution of Laplacian equation in three dimensions of water in a syphon, is done by
• If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is
• In gravity canals, F.S.L. is
• According to Bligh's creep theory, percolating water flows along
• The scour depth D of a river during flood, may be calculated from the Lacey's equation
• If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is