渭河桥) featured in the design of the 5000-yuan note of the first series of the renminbi, dated 1953, and shows a train passing over the bridge. Construction of the Sanmenxia Dam in 1960 caused extensive sedimentation problems in the lower reaches of the Wei river. In September 2003 extensive rainfall led to flooding that caused over 30 fatalities, and temporarily displaced over 300,000 people. Ecological aspects of the Wei River have been examined with respect to flow rates in the Wei River. See also Guanzhong References Rivers of Gansu Tributaries of the Yellow River Rivers of Shaanxi