GATE CE 2020: Hydrology & Irrigation Quiz 3

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Question 1

Assuming the given 1-hr UH to be triangular in shape with the time to peak as 1-hr, the peak of the 2-hr UH for the catchment (in m³/s) is

• A> 25
• B< 25
• C= 25
• DInsufficient data

Question 2

The direct runoff hydrograph in response to 5 cm rainfall excess in a catchment is shown in the figure. The area of the catchment (expressed in hectares) is ___________.

• A21.6
• B21600
• C43.2
• D43200

Question 3

An isolated 4-hour storm occurred over a catchment as follows

The φ index for the catchment is l0mm/h. The estimated runoff depth from the catchment due to the above storm is_____mm.

• A10
• B16
• C20
• D23

Question 4

The 4–hr unit hydrograph for a catchment is given in the table below. What would be the maximum ordinate of the S–curve (in m⁴/s) derive from this hydrograph?

• A22
• B25
• C29
• DNone

Question 5

The ordinates of one hour unit hydrograph at sixty minute interval are 0, 2, 8, 6, 3 and 0 m³/s. The peak discharge due to a 3 hr storm of 9 cm rainfall is

• A38 m³/s
• B51 m³/s
• C42 m³/s
• D39 m³/s

Question 6

Ordinates of a I-hour unit hydrograph at 1 hour intervals, starting from time t = 0, are 0, 2, 6,4,2,1 and 0 m³/s.

Catchment area represented by this unit hydrograph is

• A1.0 km²
• B2.0 km²
• C3.2 km²
• D5.4 km²

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