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Civil Engineering - Water Resources Engineering

Exercise : Water Resources Engineering - Section 3
36.
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)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Pick up the correct statement from the following :
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
To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor
The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm
A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error
All the above.
Answer: Option
Explanation:
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38.
Bernard's distribution graph is a plot of time on X-axis and
run off on the y-axis
total run off on the y-axis
percentage of total surface run off on y-axis
percentage of total surface run off during uniform time intervals on y-axis
none of these.
Answer: Option
Explanation:
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39.
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
40 cumecs
60 cumecs
80 cumecs
100 cumecs.
Answer: Option
Explanation:
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40.
Pick up the correct statement from the following :
The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity
Water retained by the interstices due to molecular attraction, is called pellicular water
The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield'
Sum of the percentage of specific yield and specific retention is 100
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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