Palmer Drought Index

The Palmer Drought Index, Palmer Drought Severity Index and ( PDSI ) is the most widely used index for dry phase, which is divided into 11 classifications and is used by many U.S. Government institutions. The PDSI, which was developed in the mid- 1960s, has since been further developed and modified several times and will be in addition to other indices such as the Standard Precipitation Index ( SPI ) or the Reclamation Drought Index ( RDI) used or supplemented by these