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Hydrology Test 2
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  • Question 1/6
    1 / -0
    For a catchment with an area of 600 km2 the maximum ordinate of an S-Curve obtained by a unit hydrograph of 4 hour duration is 
  • Question 2/6
    1 / -0

    Flood discharge for a 100 year return period is calculated using Gumbel’s method.

    The following data is available from the analysis:-

    1) Mean of annual data series = 30000 m3/s

    2) Standard deviation of annual data series = 300 m3/s

    3) Frequency factor = 0.2

    The estimated discharge for a flood of 100 year return period is (in m3/s up to 2 decimal places)

  • Question 3/6
    1 / -0

    The effective rainfall hyetograph and a 5-hr unit hydrograph is given below in the table 1 and table 2 respectively

    Time (hr)

    0 - 5

    5 - 10

    Rainfall intensity (cm/hr)

    2

    1

     

    Time (hr)

    0

    5

    10

    15

    20

    25

    Discharge (m3/s)

    0

    25

    50

    75

    25

    0

     

    If the area of catchment is 56700 hectares then, the runoff depth of final direct runoff hydrograph will be

  • Question 4/6
    1 / -0

    The ordinates of a flood hydrograph of 2-hour storm is given as follows:

     Time (hour)

    0

    2

    4

    6

    8

    10

    12

     Ordinate (m3/s) 

    3

    7

    12

    15

    11

    5

    3

    If the storm generates 4 cm of excess rainfall and the base flow is 3 m3/s, then the peak ordinate of a 4-hour DRH with excess rainfall of 2 cm is _______.

  • Question 5/6
    1 / -0
    Analysis of data on maximum one-day rainfall depth at Madras indicated that a depth of 280 mm had a return period of 50 years. Determine the probability (in percentage, up to two decimal places) of a one-day rainfall depth equal to or greater than 280 mm at Madras occurring two times in 15 successive years.
  • Question 6/6
    1 / -0
    The peak of a flood hydrograph due to a 3-h duration isolated storm in a catchment is 180 m3/s. The total depth of 3-h rainfall is 2.7 cm and an average loss due to infiltration is 0.3 cm/hr. The peak discharge of the 3-hour unit hydrograph for a base flow of 30 m3/s is (in m3/s up to 2 decimal places)
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