The causes of danger or risk in aqueducts are discussed,with the Paizi River Aqueduct in the irrigation area of Danjiangkou Reservoir as an example.

• 针对湖北省大中型灌区混凝土渡槽普遍存在老损率高、破坏严重、制约灌溉效益发挥的现象,以引丹灌区排子河渡槽为研究对象,探讨渡槽出现病险的原因。