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渭河是黄河最大的一级支流,发源于甘肃省渭源境内海拔2609米的乌鼠山,经风阁岭入陕,于潼关注入黄河,全河长818公里,省内河长504.4公里,省内流域面积33362平方公里,流域内集水面积在1000平方公里以上河流有8条,在100平方公里以上河流有79条。据渭河咸阳站46年水文资料统计,多年平均径流量56.5亿米~3,占全省地表水资源总量的13.5％。渭河为多泥沙河流,多年平均含沙量31.2公厅/米~3,最大含沙量729公斤/米~3(出现在1968年),多年平均输沙量1.68亿吨,侵蚀模数3500吨/平方公里,悬移质泥沙颗粒级配平均粒径0.051毫米。
The Weihe River, the largest tributary of the Yellow River, originates from Wushe Mountain at 2609 meters above sea level in Weiyuan, Gansu Province. It flows into Shaanxi Province through Fengfengling and flows into the Yellow River at Tongguan. The entire river is 818 kilometers long and the province is 504.4 kilometers long. The drainage area of 33362 square kilometers, watershed catchment area of 1000 square kilometers in more than eight rivers, more than 100 square kilometers there are 79 rivers. According to the 46-year hydrological data of Xianyang Railway Station in Weihe River, the average runoff in many years is 5.65 billion m 3, accounting for 13.5% of the total surface water resources in the province. The Weihe River is a multi-sediment river, with an average sediment concentration of 31.2 km / m 3 and a maximum sediment concentration of 729 kg / m 3 (appearing in 1968). The average annual sediment transport volume is 168 million tons and the erosion modulus is 3500 Ton / km2, suspended sediment particle size distribution with an average particle size of 0.051 mm.