The right side-slop of the main powerhouse of Jinghong Hydropower Station stands close to the right scouring bottom hole,which is a part of the second stage cofferdam and comes into being before the excavation of main powerhouse.
景洪水电站主厂房右侧紧邻右冲沙底孔,右冲沙底孔作为二期纵向围堰的组成部分,在主厂房开挖前已经形成。