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# GATE (CE) 2022 : HYDROLOGY AND IRRIGATION QUIZ#1

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Question 1

The normal annual rainfall at station I, II, III, and IV in a basin are 155, 150, 150 and 105 cm respectively. In the year 2000, stations I, II and III received annual rainfalls of 156, 140 and 104 cm respectively. Estimated value of rainfall (in cm) at station IV during the year 2000 is

Question 2

The level of water in the reservoir is 1.25 m. If there is a rainfall of 38 cm occurring in a month, during this period evaporation as measured by the class A pan is 32 cm. What is the level of water in m at the end of the month.

Question 3

A watershed has five non-recording raingauges, installed in its area. The amount of rainfall recorded for one of the year is given below: Find the sum of the required optimum number of non-recording and recording rain gauges for this catchment. Assume an error of 10% in the estimation of mean rainfall.

Question 4

Rainfall depth over a watershed is monitored through six number of well distributed rain gauges. Gauged data are given below: The Thiessen mean value (in mm, up to one decimal place) of the rainfall is ____________

Question 5

A lake with surface area of 400 ha has saturation vapour at water surface = 18.96 mm of Hg and actual vapour pressure of air = 9.24 mm of Hg. The wind velocity at 2.5m above the ground surface is 12.5 km/hr. Estimate the average daily evaporation from the reservoir in mm/day using Meyer’s formula considering it to be a shallow water body.

Question 6

Five rain gauges are located on a basin as shown in figure. What will be the mean rainfall (in cm) over the basin using Thiessen Polygon method, if the rainfall at stations A, B, C, D and E are 10 cm, 8 cm, 11 cm, 12 cm and 9 cm respectively? • 356 attempts
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