Irrigation, Waterways , Hydrology Section 11
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1) Question.
The peak of a 4- hour flood hydrograph is 240m^3/sec. If the rainfall excess is 80 mm and base flow which is constitution 40 m^3/sec, then the peak of 4 hours unit hydrograph will be
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2) Question.
As compared to gravity dam, earthern dams
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3) Question.
For wave action dams, the maximum height of free board is generally taken to be equal to
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4) Question.
By providing a top width for roadway and a free board in the elementary profile of a gravity dam, the resultant force for full reservoir condition will
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5) Question.
The focus of vase parabola for a dam having a horizontal drainage filter is at a distance of
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6) Question.
The maximum possible height of a safe dam having an elementary profile is
where f =allowance stress of dam material, G= specific gravity of dam material, W= unit weight of water
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7) Question.
In the empty condition of reservoir and with the elementary profile of a dam, the vertical stress at heel and toe respectively are given by
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8) Question.
The uplift pressure on a dam can be controlled by
i) constructing cutoff under upstream face
ii) constructing drainage channels between the dam and its foundation
iii) by pressure grouting in foundation
The correct answer is
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9) Question.
When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be
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10) Question.
The forces which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are
(i) water pressure
(ii) self weight
(iii) uplift
(iv) pressure due to earthquake
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11) Question.
The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after
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12) Question.
Trap efficiency of a reservoir is a function of
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13) Question.
For a flood control reservoir, the effective storage is equal to
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14) Question.
The water stored in the reservoir below the minimum pool level is called
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15) Question.
Dimensions of coefficient of transmissibility are
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16) Question.
The relation between probability (P) and recurrence interval (T) is given by
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17) Question.
According to Dicken's formula for estimating floods, the peak discharge is proportional to
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18) Question.
If a 4-hour unit hydrographs are staggered and added graphically, the resulting hydrograph will be
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19) Question.
The unit hydrograph of a specified duration can be used to evaluate the hydrgraph of storms of
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20) Question.
The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by
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