姚暹渠是一条大型人工排洪河渠,全长65公里,多数地段高出地面数米。它发源于山西省夏县境内,穿越运城市市区,经永济县伍姓湖入黄河。河渠两岸的缓坡上,杂草丛生,尤其是杠柳(Periploca seqium)生长最盛,年生长量竟达1～2米,严重地阻滞了洪水排泄。 Yao Siam drainage is a large man-made discharge canal, a total length of 65 km, the majority of lots above the ground a few meters. It originated in Xia County, Shanxi Province, through Yuncheng city, Yongji County Wu into the Yellow River. Periploca seqium grows most on gentle slopes along both sides of the canal, with an annual growth rate of 1-2 meters, which seriously hinders flood discharge.