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Civil Engineering :: Water Resources Engineering

  1. The area of a drainage basin whose axial length is 100 km is 2500 sq. km. Its form factor is

  2. A.
    0.10
    B.
    0.20
    C.
    0.25
    D.
    0.30
    E.
    0.35

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  3. 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

  4. A.
    205 sq. km.
    B.
    215 sq. km.
    C.
    225 sq. km.
    D.
    235 sq. km.
    E.
    245 sq. km.

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  5. The elevation Z of the watershed is : (where letters carry their usual meanings)

  6. A.
    reduced level of the top most point of the basin
    B.
    reduced level of the lower most point of the basin
    C.
    average elevation of the highest and lowest point of the drainage basin
    D.
    obtained by the formula

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  7. Run off is measured in

  8. A.
    cubic metres
    B.
    cubic metres per sec.
    C.
    cubic metres per minute
    D.
    cubic metres per hour.

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  9. 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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  11. 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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  13. Pick up the correct statement from the following :

  14. 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
    B.
    To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor
    C.
    The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm
    D.
    A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error
    E.
    All the above.

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  15. Bernard's distribution graph is a plot of time on X-axis and

  16. A.
    run off on the y-axis
    B.
    total run off on the y-axis
    C.
    percentage of total surface run off on y-axis
    D.
    percentage of total surface run off during uniform time intervals on y-axis
    E.
    none of these.

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  17. 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

  18. A.
    40 cumecs
    B.
    60 cumecs
    C.
    80 cumecs
    D.
    100 cumecs.

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  19. Pick up the correct statement from the following :

  20. A.
    The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity
    B.
    Water retained by the interstices due to molecular attraction, is called pellicular water
    C.
    The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield'
    D.
    Sum of the percentage of specific yield and specific retention is 100
    E.
    All the above.

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