Question

The monthly consumptive use is given by _____________

(a) Cu = k.p/40 [1.8t + 32]

(b) Cu = k.p/40 [1.8t – 32]

(c) Cu = k.p/40 [t + 32]

(d) Cu = k.p/40 [t – 32]

I had been asked this question in final exam.

The doubt is from Water Requirements of Crops in portion Water Requirements of Crops of Irrigation Engineering

Answer 1

The correct option is (a) Cu = k.p/40 [1.8t + 32]

To explain I would say: BLaney – Criddle formula is used to calculate monthly consumptive use.

Cu = k.p/40 [1.8t + 32]

 Where, Cu is monthly consumptive use in cm, K = crop factor, T = mean monthly temperature in °C, and P = monthly % of annual day light hours that occur during the period.