Question

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

(a) Lowry Johnson method

(b) Penman’s equation

(c) Hargreaves method

(d) Inflow-outflow method

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I'm obligated to ask this question of Water Requirements of Crops topic in section Water Requirements of Crops of Irrigation Engineering

Answer 1

The correct choice is (d) Inflow-outflow method

Easy explanation: Inflow-outflow method is a direct method in which field observations are made and physical models are used for the purpose. Lowry Johnson, Penman, and Hargreaves method are all empirical methods.