Civil Engineering - Water Resources Engineering

Exercise :: Water Resources Engineering - Section 2

31.

A unit hydrograph is a hydrograph of a rain storm of a specified duration resulting from a run-off of

 A. 15 mm B. 20 mm C. 25 mm D. 30 mm.

Explanation:

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32.

Pick up the correct statement from the following :

 A. The specified duration of unit hydrograph, is called unit duration B. The rain during specified duration, is called unit storm C. A unit hydrograph for a particular unit duration may be utilised for evaluating the run off hydrographs of other storms of like durations D. The number of unit hydrographs for a given basin, is theoretically infinite E. All the above.

Explanation:

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33.

The best unit period of a unit hydrograph, is equal to basin lag divided by

 A. 2 B. 3 C. 4 D. 5

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34.

If total run off of a basin of 50 hectares is 0.8 cm, the ordinate of Bernard's distribution graph, may be calculated by the formula (where Q is the discharge in cumecs at the given time)

 A. y = 50 Q B. y = 100 Q C. y = 150 Q D. y = 200 Q E. y = 250 Q

Explanation:

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35.

Pick up the correct statement from the following :

 A. The zone below water table, is called zone of saturation B. The zone above water table, is called zone of aeration C. The water which exists in the zone of saturation, is called ground water D. Water in the zone of saturation, remains under hydrostatic pressure E. All the above.