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(一)汉江通称汉水,又名襄河,发源于秦岭南麓,全长1,530公里,流经陕西、湖北两省,于武汉市汇入长江,总计流域面积为174,000平方公里,它是长江最大的支流之一。汉江自钟祥以下,称为下游,计长330公里,包括16个县和武汉市的长江左岸部分,面积共35,600平方公里。由于河道断面愈下愈小,又受长江洪水顶托的影响,以致泄洪能力不足,因之常常泛滥成灾。仙桃以下的河槽断面,仅及泽口以上的一半,河槽泄洪能力,也是愈下愈小,沙洋以上,可通过18,000秒公方;沙洋至泽口可通过14,000秒公方;泽口至仙
(A) Han River, commonly known as Han River, also known as Xiang River, originating in the southern foot of Qinling Mountain, a total length of 1,530 kilometers, flows through Shaanxi and Hubei provinces, in the Yangtze River into Wuhan, a total basin area of 174,000 square kilometers, it is the Yangtze River One of the largest tributaries. Han River since Zhongxiang, known as the lower reaches, 330 km long, including 16 counties and the left bank of the Yangtze River in Wuhan City, an area of 35,600 square kilometers. Due to the smaller and smaller river sections, but also by the impact of the Yangtze River floods, resulting in inadequate capacity of flood discharge, which often flooded. Xiantao below the river channel section, and only Ze mouth above half of the flood discharge capacity of the river channel, but also smaller and smaller, Shayang above, through the 18,000 seconds to the public square; Shayang to Zekou pass 14,000 seconds to the public; Ze mouth Sin