特殊用法contracted weir1.收缩堰curved-sided weir1.曲线堰downflow weir1.溢流堰draw-door weir1.竖直闸门堰flush weir1.溢水堰heavy phase weir1.重相堰overfalling weir1.溢水堰overflow weir1.溢洪堰shutter weir1.横轴闸门堰submerged weir1.潜堰waste weir1.超量水溢流堰