V weir is sensitive to various factors and is ineffective to hold uniform outlet, so the SS losses with the outlet flow always worse the quality of effluent at the time of high loading.

• 三角堰出水形式由于受多种因素的影响，往往不能作到均匀出水，使悬浮固体易在高堰负荷时进入出水中，影响了二次沉淀池的出水水质。