Fig. 6
Probability density distribution of the long-term mean annual aridity index67 (a) and of ground elevation per well61 (b). Predominant land use and land cover (LULC) around each well58 (c). Probability density distribution of permeability68 (d) and of the distance between each well and the closest stream per well71 (e). Spatial distribution of the long-term mean annual aridity index (f), and of ground elevation (g), of main LULC types (h), of permeability (i), of streams (j), and wells included in this database across Brazil (k). Aridity index classes follow the classification from the Food and Agriculture Organization of the United Nations82. Elevation classes are based on the Brazilian Institute of Geography and Statistics83. The LULC classification is from the MapBiomas Collection 8 project58. Permeability is represented on a logarithmic scale for better visualization.
