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What are the values of KBDI (Keetch-Byram Drought Index) in each class for interpretation of drought event?

It ranges from 0 to 800 with the value of 800 having no moisture (indicating extreme drought) in the upper layers of the soil and 0 indicating saturated soil. The Keetch-Byram Drought Index is a surrogate for the amount of moisture in the upper layers of the soil (Keetch and Byram, 1988), and according to this point it has five class. Therefor they are five classes, namely 0-150, 150-300, 300-500, 500-700, and 700-800. For obtaining more details refer to Janis et al., 2002. For more details you can read KBDI Drought paper

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