The full round port area provides maximum flow capacity and minimum head loss.

完全的圆形流道截面能够提供最大的流量和最小的流压损失。

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As the maximum water holding capacity is reached, there is a reduction in flow.

当达到最大持水量时，流量降低。

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As the maximum water holding capacity is reached, there is a reduction in flow.

当达到最大持水量时，流量降低。

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