| Number (In Section 4, octet 11) |
Parameter | Units |
Abbrev |
|---|---|---|---|
| 0 | Standard Precipitation Index (SPI) (See Note) | dimensionless | SPI |
| 1 | Standardized Precipitation Evapotranspiration Index (SPEI) | dimensionless | SPEI |
| 2 | Standardized Streamflow index (SSFI) | dimensionless | SSFI |
| 3 | Standardized Reservoir Supply Index (SRSI) | dimensionless | SRSI |
| 4 | Standardized Water-level Index (SWI) | dimensionless | SWI |
| 5 | Standardized Snowmelt and Rain Index (SMRI) | dimensionless | SMRI |
| 6 | Streamflow Drought Index (SDI) | dimensionless | SDI |
| 7-191 | Reserved | ||
| 192-254 |
Reserved for Local Use |
||
| 255 |
Missing |
| Notes:
(1) Descriptions of the drought indices in discipline 0, meteorology, category 22 are available in the
Handbook of Drought Indicators and Indices (WMO-No. 1173) [https://library.wmo.int/idurl/4/55169].
The indices are specified by setting discipline and parameter category/number to the specific index to be encoded.
Drought indicators are calculated over different time ranges, prescribed by the 'Length of time range' and
'Indicator of unit for time range' parameters in the templates 4.107, 4.108, 4.109 and 4.112. All standardized
drought indices are calculated according to the Standardized Precipitation Index User Guide
(WMO-No. 1090)[https://library.wmo.int/idurl/4/39629]. |