Calculating Kcini value
cal_Kcini_for_SingleKc(Pmean, ET0, tw, type, fw)
A value for Kcini value
is the average depth od infiltrated water per wetting events(mm)
mean ET0 during initial period(mm/day)
is the mean interval between wetting events(days)
soil type:"coarse soil textures" and "medium and fine soil textures"
the fraction of surfaces wetted by irrigation or rain (0-1)
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. FAO Irrigation and drainage paper No. 56. Rome: Food and Agriculture Organization of the United Nations, 1998.