Joint Questionnaire OECD/Eurostat. The questionnaire is based on clearly defined tables including definitions and formats requested. It includes the whole water cycle from abstraction to use and then discharge, and additional tables on quality of some rivers and lakes only used by OECD. Quantities of water abstracted, and used, capacity of waste water treatment plants, sludges produced, and emissions of chemicals, of which heavy metals from the sources industry, agriculture and human settlements. It consists of data and textual information (footnotes).
The map is made using the global digital elevation model (DEM) derived from GTOPO30. Note that the values in the file are not the original elevation data. The data has been processed to create an image for presentation purposes streching a predefined colour template over the derived values.