Civil Engineering :: Water Resources Engineering
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The area of a drainage basin whose axial length is 100 km is 2500 sq. km. Its form factor is
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If the axial length of a drainage basin is 35 km and its form factor is 0.2, the total area of the basin is
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The elevation Z of the watershed is : (where letters carry their usual meanings)
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Run off is measured in
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The rational formula for calculating the discharge, is (where A is the area of basin and Po is one hour rainfall)
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The formula for calculating the overland flow time (To) in hours for any basin, is (where Lo is the distance of the critical point and H is the difference in elevation)
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Pick up the correct statement from the following :
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Bernard's distribution graph is a plot of time on X-axis and
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An intense rain is falling at a uniform rate of 7.5 cm/hour for a period of 60 minutes on a basin whose areas is 500 hectares. If the average infiltration capacity during the entire rain period is assumed to be 1.5 cm/hr, the maximum run-off rate based on 10 minute peak percentage of 16% from distributing graph of the basin, is
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Pick up the correct statement from the following :
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A.
The unit hydrograph of a specified unit duration obtained from the past data can be used to obtain the hydrograph of future storms of like duration
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B.
To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor
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C.
The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm
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D.
A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error
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E.
All the above.
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A.
The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity
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B.
Water retained by the interstices due to molecular attraction, is called pellicular water
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C.
The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield'
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D.
Sum of the percentage of specific yield and specific retention is 100
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E.
All the above.
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