梯形堰 [水利] trapezoidal weir ; cipoletti weir ; Weir trapezoidal

矩形堰 [水利] rectangular weir

三角形堰 Weir triangular

圆形堰 circular weir

平坦V形堰 flat V-type weir

圆形围堰 circular cofferdam ; circular cofferdfeel

弧形堰顶 arc crest

格形围堰 cellular cofferdam ; cellular cofferdfeel

堰顶形状 shape of weir crest

直形立堰 Weir vertical