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hello @all. I try to prepare annual kc value for annual water yield model by using kc calculator. I got the ETo value from FAO. The unit used by FAO is mm/day for the mean monthly ETo data while the kc calculator needs mm/month. How I can convert from mm/day to mm/month? 

I tried to multiple by number of days in a month and I divided the yearly data by 12. Finally I tried to compare  mean of these result and i found big gap. please help me.
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