Q. What is the correct formula for Gross irrigation requirement?

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Q. Which formula is extensively used for estimating seasonal water requirements?

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Q. Which method is time-consuming and expensive?

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Q. Which of the following is not an empirical method of determining consumptive use?

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Q. The evapotranspiration rate is higher in light green vegetation than in dark green vegetation.

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Q. The monthly consumptive use values for paddy are 26.69, 8.76, 14.38, 22.73, 21.29, 25.50 and 15.06 for the duration of month from June to July. What is the average daily consumptive use?

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Q. Which of the following statement is wrong about consumptive use coefficient?

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Q. What is the range of reflection coefficient for close-grained crops?

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Q. Which method is widely used in India for the computation of consumptive use?

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Q. The average value of Eₜ/Eₚ for citrus crops?

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Q. The monthly consumptive use is given by _____________

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Q. Determine the pan evaporation from the following data using the Christiansen method.

Extra-terrestrial radiation in cm = 47.3 cm
Coefficient of temperature(Cₜ) = 1.403
Coefficient for wind velocity (Cw)= 1.2
Coefficient for relative humidity (Cₕ) = 1
Coefficient for percent of possible sunshine(Cₛ) = 1.073
Coefficient of elevation(Cₑ) = 1.014

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Q. Which method involves the use of crop factor?

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Q. What are the dimensions of the standard class-A pan?

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Q. Penman’s equation for the estimation of PET has been derived by using ___________

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Q. Albedo or reflection coefficient factor is used in which method?

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Q. Penman’s equation can also be used to compute evaporation from a water surface like a lake if _________

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Q. The pan evaporation can also be determined by Christiansen formula.

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Q. What is the consumptive use for a crop in the month of April having a consumptive use coefficient equal to 0.80 and pan evaporation is 35 cm?

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Q. Compute the total consumptive use for a drainage basin by Penman’s formula. The slope of saturation vapour pressure V/s chart at 40°C is 2.95 mm of Hg/°C and the net incoming solar radiation is 5.705 mm of evaporative water/day. Assume, Eₐ = 18.07 mm/day and Psychrometric constant = 0.49 mm of Hg/°C.

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