GATE 2019 Hydrology Day 3 Quiz

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Question 1

At a station, Storm 1 of 5 hour duration with intensity 2 cm/h resulted in a runoff of 4 cm and storm II of 8 hour duration resulted in a runoff of 8.4 cm. Assume that the f–index is the same for both the storms.

The f–index (in cm/h) is:

• A1.2
• B1.0
• C1.6
• D1.4

Question 2

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 3

The peak discharge of a 4-hr unit hydrograph, triangular in shape, for a basin of 108 km², is 20 cumecs. The time base (in hrs)of this hydrograph is

• A4
• B8
• C20
• D30

Question 4

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 5

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 6

In reservoirs with an uncontrolled spillway, the peak of the plotted outflow hydrograph

• Alies outside the plotted inflow hydrograph
• Blies on the recession limb of the plotted inflow hydrograph
• Clies on the peak of the inflow hydrograph
• Dis higher than the peak of the plotted inflow hydrograph

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