The ‘modified Hargreaves’ method

[sunsiqi]

Dear Nat Cap Team.
I would like to ask if The unit of ET0 calculated by using The ‘Modified Hargreaves’ Method formula (𝐸𝑇0=0.0013×0.408×𝑅𝐴×(𝑇𝑎𝑣+17)×(𝑇𝐷−0.0123𝑃)0.76) is mm/day? If I want to use this value to compute the monthly ET0, do I need to multiply it by the number of days per month?

Sunsiqi

[swolny]

Hi @sunsiqi -

Yes, the units of Modified Hargreaves is mm/day, so you do need to multiply it by the number of days per month.

~ Stacie

[sunsiqi]

ok! Thanks very much！