61. The aqueduct or superpassage type of works are generally used when
62. The most suitable chemical which can be applied to the water surface for reducing evaporation is
63. According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
64. The best unit duration of storm for a unit hydrograph is
65. S-hydrograph is used to obtain unit hydrograph of
66. Regime conditions in a channel may occur if
67. The ratio of the rate of change of discharge of an outlet and parent channel, is known as
68. Dimensions of coefficient of transmissibility are
69. According to Khosla’s theory, the exit gradient in the absence of a downstream cutoff is
70. For cereal crops the most commonly adopted method of irrigation, is
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