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The index which refers to moisture deficit or surplus in an area is called Moisture Index.
The term used instead of 'moisture budget', e.g. by C. W. Thornthwaite (1955), and calculated from the aridity and humidity indices, as I m = 100 × (S − D)/PE, where I m is the moisture index, S is the water surplus, D is the water deficit, and PE is the potential evapotranspiration.