Long-term relative decline in evapotranspiration with increasing runoff on fractional land surfaces
Data sets
The global reservoir and dam (GRanD) data https://sedac.ciesin.columbia.edu/data/collection/grand-v1/sets/browse
The global map of irrigated areas http://www.fao.org/aquastat/en/geospatial-information/global-maps-irrigated-areas/latest-version/