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You need to get the ETCo( Crop water requirement + Evaporation
Evaporation on daily basis for peak period i.e. June, July months
kC values of different crops
Soil moisture holding capacity
Age of the crop/ trees i.e., growth stage
Depending on the trees, temperature of the atmosphere and degree of soil cohesion
ETC=ET0+evaporation and you need to conisder the plant type
Through ETo and Kc Values.
Trees (80 L/D)
sHRUBS (20 L/D)
Ground Cover (12 l/m2)
Plants water requirement + Evapotranmission rate + Soil Water holding capacity.
Consider the avergage plants water requirementd and location climate.