61. A land is known as waterlogged
62. When the reservoir is full, the maximum compressive force in a gravity dam is produced
63. 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
64. Fundamental momentum equation for a hydraulic jump, is
65. The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
66. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by
67. Solution of Laplacian equation in three dimensions $$\frac{{{{\text{d}}^2}\varphi }}{{{\text{d}}{{\text{x}}^2}}} + \frac{{{{\text{d}}^2}\varphi }}{{{\text{d}}{{\text{y}}^2}}} + \frac{{{{\text{d}}^2}\varphi }}{{{\text{d}}{{\text{z}}^2}}} = 0$$ of water in a syphon, is done by
68. In case of a trapezoidal notch fall
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