Irrigation, Waterways , Hydrology Section 4
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1) Question.
Partial duration series is mostly used for
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2) Question.
If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be
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3) Question.
For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is
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4) Question.
To estimate the magnitude of a flood with a return period of T years, Gumbel's distribution method required the following data pertaiming to annual flood series
i) mean value
ii) standard deviation
iii) length of record
iv) coefficient of skew
The correct answer is
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5) Question.
A 4 hour direct runoff hydrograph of a catchement is triangular in shape with a time base of 100 hours and peak flow of 50m^3/sec. The catchment area is 360 km^2. The peak flow of this catchment area foe a 4-house unit hydrograph is
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6) Question.
A unit hydrograph has one unit of
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7) Question.
For a catchmemt area of 120kms^2, the equilibrium discharge in m^3 per hour of an S-curve obtained by the summation of 6-hour unit hydrograph is
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8) Question.
Instantaneous unit hydrograph is a hydrograph of
i) unit duration
ii) unit rainfall excess
iii) infinitely small duration
iv) infinitely small rainfall excess
The correct answer is
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9) Question.
The shape of recession limb of a hydrograph depends upon
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10) Question.
In the demand line drawn from a ridge in a flow-mass curve does not intercept the curve again, it indicates that
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11) Question.
The flow - mass curve is graphical representation of
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12) Question.
The stream which does not have any base flow contribution is called
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13) Question.
The stage of river carrying a discharge of Q m^3/sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10m with a water surface slope of (1/1000) will be
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14) Question.
In the moving boat method of stream flow measurements, the following measurements are required
i) velocity and direction of current meter
ii) speed of the boat
iii) depths and time interval between depth readings
The correct answer is
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15) Question.
Which of the following methods are used to estimate flood discharge based on high water marks left over in the past?
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16) Question.
A six hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If ¢ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is
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17) Question.
The most suitable chemical which can be applied to the water surface for reducing evaporation is
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18) Question.
The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 year. The probability of 24 hours rainfall equal to or greater than 300 mm occurring atleast once in 10 years is given by
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19) Question.
The maximum average depth due to one day storm over an area of 100kms^2 is 100mm. Depth - Area - Duration (DAD) curves indicate that for the same area of 100km^2 the maximum average depth for a three hours storm will be
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20) Question.
In India which of the following is adopted as standard recording rain gauge
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