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AQUASTAT database symbols

The AQUASTAT database symbol scheme has changed to provide more information to users, and for consistency with developing FAO initiatives.

Here is an explanation to the new symbols:

  L Modelled value
  I Internal estimate (previously known as F)
  K Aggregate value, either an aggregate of more than one source, or a calculated value depending on values with mixed symbols that include "external" values (E) or aggregate values (K) in addition to at least one value without a K or E symbol
  E External value (reported by another international agency*)

* Some of the data provided in the AQUASTAT database were generated by other agencies. There are two reasons why the AQUASTAT database includes these numbers:

  • A specific variable is outside of AQUASTAT's mandate (ex. population, country area).
  • Another agency might have a specific value that replaces either an AQUASTAT data gap or less-dependable value. This is frequently the result of on-going harmonization.

In the future, the source for values with an E symbol will be provided directly on the database. In the meantime, please refer to the following table. If a value in the AQUASTAT database has the E symbol, its source is:

FAOSTAT Variables: Total area, Arable land, Permanent crops, Total and Urban populations, Male, Female and Total economically active population in agriculture
CRU Variables: Average precipitation in depth
World BankVariables: Agriculture, value added to GDP
FAO Climpag Variables: National Rainfall Index (NRI)
UNDPVariables: Human Development Index (HDI)
EurostatVariables: Water resources and Water use sections
UNSDVariables: Water resources and Water use sections
OECDVariables: Water use sections

Data without a symbol comes from one national source that can be a report, a publication or an official website.

View the new symbols in the AQUASTAT database today!

As always, if there are any questions, please direct them to AQUASTAT.