61. Which of the following can be used as a meter fall ?
62. The value of Sodium Absorption Ratio for high sodium water lies between
63. 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
64. If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by
65. Borrow pits should preferably be located in
66. Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less
67. In gravity canals, F.S.L. is
68. Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?
69. If $$\Delta $$ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is
70. The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called
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