Average annual runoff in Europe
Based on gauged data from hydrometric networks. Run-off in ungauged areas estimated from an empirical relationship relating run-off to precipitation and potential evaporation (Budyko, M.I. and Zubenok, L.I. : The determination of evaporation from the land surface. Izv. Akad, Nauk SSSR. In Ser. Geogr., No 6, p. 3-17).
For references, please go to http://www.eea.europa.eu/data-and-maps/figures/average-annual-runoff-in-europe or scan the QR code.
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