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ESE 2021 Technical Quiz || Infiltration and Runoff

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Question 1

A raingauge recorded hourly rainfall as 5 cm, 2 cm, 4 cm and 3 cm for a four hour storm respectively. If the ϕ index was 3 cm/hour, the total direct runoff from a catchment for the storm was

Question 2

A catchment of area 100 ha received a rainfall of 10 cm in 2 h due to storm. At the outlet of the catchment, the stream draining the catchment was dry before the storm and experienced a runoff lasting for 8 h with an average discharge value of 2 m3/s. the stream was again dry after the runoff event. What is the loss of water?

Question 3

Which of the following are the causes of inconsistency of rainfall?

I- Shifting of rain gauge

II- Neighbour hood of station has marked changes

III- recording of data multiple times a day but according to standard time

IV- Occurrence of observational error from a certain date.

Question 4

If the coefficient of variation of rainfall values at 4 rain gauge stations is 30% and permissible error in the estimation of mean rainfall is 10%, then the additional number of rain gauge stations required in the catchment is

Question 5

A reservoir has a catchment area is about 150 hectares. The rainfall is 2.5times of run-off and the catmint gets 10 cm rainfall, a stream flow at the catchment outlet lasts for 10 hours, what is average stream flow in the period?
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