Fig. 2: Average annual precipitation, streamflow, and sediment discharge for the Western Amazon.
From: A baseline for assessing the ecological integrity of Western Amazon rivers
A Average annual precipitation (mm/year) in Western Amazon river basins at Basin Level 6 (BL646). The Andes mountains are outlined in thick black. Precipitation is generally highest in northern tributaries and decreases moving southeast. Precipitation is also generally less in the high Andes compared to lower elevations. B Average annual streamflow discharge (m3/s, log scale) of Western Amazon river basins at BL6 for the period 1990-2009. Streamflow contributions from Andean basins vary, although northern basins generally have higher streamflows than southern basins. These patterns are consistent with precipitation patterns, reflecting that streamflow in the Western Amazon is largely driven by precipitation patterns. C Average annual sediment discharge (tons/year) for Western Amazon streams in the period 1992–2009. Sediment discharges from rivers of Andean origin are significantly higher than discharges from rivers of non-Andean origin.
