2、根据出流条件的不同 自由出流（free discharge）—— p c =p a 淹没出流（submerged discharge）—— 孔口淹没在下游水面之下。
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submerged discharge valve 淹没式泄水阀
submerged discharge of pipe flow 管道淹没出流
submerged discharge pipeline 水下排泥管
It has realistic significance to research on using working gate with submerged discharge to measure water in canal for slab irrigation district.
对于平原灌区，研究利用以淹没出流为主的工作闸门进行渠道量水具有现实意义。
In the case of small opening, submerged discharge, and water-stop rubber damage, the interaction between water and gate may cause vibration which result in gate damage.
在小开度、淹没出流情况下，如果止水橡胶损坏，水和闸门的相互作用将导致闸门产生破坏性的振动。
Changes of the water level on submerged and non-submerged condition are similar on the whole, and variation amplitude of water lever increases with the increasing discharge in both situation.
非淹没及淹没情况下水位变化规律基本相似，两种情况下水位变幅均随流量的增加而增大。
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