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ESE 2021 Technical Quiz || Precipitation, Evaporation and Evapotranspiration

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Question 1

Calibration of a current meter for use, in channel flow measurement is done in a

Question 2

Consider the following statements:
1). The normal annual rainfall of a station is obtained as the arithmetic average of the successive annual rainfall in the last 30 years.
2). The ‘normal rainfall are updated by deleting the needful number of oldest years data from the record and adding the needful number of most recent years data to the record.
3). The standard deviation computed for the rainfall of the same 30 years of rainfall data is taken as a measure of the variability of the rainfall during the self same set of years.
4). If the observed rainfall in any year is less than the current normal annual rainfall, then that year is called a dry year.

Which of the above statements are correct?

Question 3

In a river carrying a discharge of 142 m3/s, the stage at a station A was 3.6 m and the water surface slope was 1 in 6000. If during a flood, the stage at A was 3.6 m and the water surface slope was 1 in 3000, what was the flood discharge (approximately)?

Question 4

Consider the following statements concerning precipitation:
1) The Isohyetal map method of determining the average precipitation is considered to be better than the Thiessen method.
2) There is no possibility of damaging the storms because of cloud seeding activity.
3) Water that percolates through the soil emerges as the dry weather flow in streams.
Which of the above statements are correct?

Question 5

A standard, ground-based evaporation pan, corresponding to Indian Standards, is installed at the banks of a surface reservoir. The water surface area on a particular day is 100 hectares. The recorded evaporation loss from the pan, on a certain day, is nearly 4.0 cm. what is the anticipated evaporation loss from the reservoir for that day?
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