One map shows average annual runoff patterns. A second map, accompanied by bar graphs for selected gauging stations of representive rivers, expresses the volume of flow by months as percentages of the annual average volume.
List of 4th Edition Maps
List of Map Archive Collections
Download full size map ( 1,758 KB JPEG, 2130 x 3030 pixels )
Download Map in PDF ( 1,825 KB, Adobe Acrobat Reader required )