Hydrology and Ground Water

91. Isohyets are the imaginary lines joining the points of equal

1. Pressure
2. Height
3. Humidity
4. Rainfall

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92. Isopiestic lines are the contours

1. Drawn to represent water table
2. Drawn to represent piezometric heads
3. Drawn to piezometric surface
4. None of these

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93. Izzard formula for the time of concentration in minutes for the plots having no channels, is (where L₀ is the length of overland flow in metres and Kp rainfall intensity in cm/hour)

1. T = 111 b. L₀ ^1/3/(Kp)^2/3
2. T = 222 b. L₀ ^1/2/(Kp)^1/3
3. T = 333 b. L₀/Kp
4. T = 111 b. L₀ ^1/3/(Kp)^2/5

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94. Knowledge of hydrology is necessary for civil engineers for

1. Designing and construction of irrigation structures
2. Designing and construction of bridges and culverts
3. Flood control works
4. All the above

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95. Levees and flood walls,

1. Are designed to carry unbalanced water load
2. Are designed with adequate dimensions
3. Are means of controlling floods
4. Are never provided free-boards

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96. Lining of irrigation channels

1. Increases the water-logging area
2. Decreases the water-logging area
3. Does not change the water logging area
4. None of the above

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97. Main purpose of mean water training for rivers is

1. Flood control
2. To provide sufficient depth of water in navigable channels, during low water periods
3. To preserve the channel in good shape by efficient disposal of suspended and bed load
4. All of the above

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98. Which of the following types of falls use parabolic glacis for energy dissipation?

1. Vertical drop fall
2. Glacis fall
3. Montague type fall
4. Inglis fall

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99. Non-recording rain gauges

1. Collect the rain whose volume is measured by means of graduated cylinders
2. Collect the rain which is directly measured by means of graduated cylinders in centimetres of water depth
3. Are generally used in hilly terrain
4. Are cylindrical in shape

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100. Pettis formula Q = C (P.B)^5/4 cumecs, is based upon

1. Rainfall and drainage area
2. Run off and drainage area
3. Drainage area and its shape
4. Drainage area

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