张戎，字仲功，西汉末年大司马史。 汉平帝元始四年（公元４年），王莽召集群臣征求治河意见，张戎指出黄河的特性：“水性就下，行疾则刮除成空而稍深。河水重浊，号为一石水而六斗泥。令西方诸郡，以至京师东行，民皆引河、渭山川水溉田。春夏干燥，少水时也，故使河流迟，贮 Zhang Rong, the word Zhong Gong, the Western Han Dynasty Sima history. Han Ping imperial Yuan four years (AD 4 years), Wang Mang summoned the ministers to seek advice on governance, Zhang Rong pointed out the characteristics of the Yellow River: "water on the next, line disease is scraped off into the air and slightly deeper. Water and six bucket of mud. So that the West Zhuge, as well as the capital eastbound, people are cited the river, Weishan water irrigation. Spring and summer dry, less water, so the river late, storage