一渠道横断面设计塑膜防渗渠道断面结构的整体性比一般土渠差。因此,对渠道断面要素的设计应该重视.渠道宽深比应比同类七渠为大,这样渠道流速相应减小,免遭水流冲刷.同时因宽深比较大,易使边坡保持稳定,施工方便. A channel cross-section design Plastic Impermeable channel cross-sectional structure of the overall poor than the general soil channel. Therefore, the design of the channel cross-section elements should be taken seriously.The channel depth ratio should be larger than the same seven channels, so the channel flow rate is reduced accordingly, from the erosion of the water.At the same time because of the wide and deep, easy to make the slope stable, construction Convenience.