source: http://www.fao.org/nr/water/aquastat/data/query/index.html?lang=en
because there is no bulk download available for this dataset, so we need to download the source using the query interface from fao.
- select a group of variables. (selecting all group won't will result in a error because there are too much data to display)
- select all country
- select all period
- select 'None' in metadata
- click Submit
- download flat CSV in the result page.
There are some measures that share same name/description but different varialbe Id in the dataset. Issue #1