Okla. Admin. Code § 35:20-13-13 - Drought conditions evaluation
Drought severity shall be determined by the Director using the Keetch-Byram Drought Index (KBDI) during the vegetative growing season between May 1 and October 31 and the Palmer Drought Severity Index (PDSI) during the dormant vegetative season between November 1 and April 30.
Notes
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