With the upstream water level reducing and the downstream water level increasing, the highest tangent velocity also moving to the pipe center.

随上游水位的降低及下游水位的升高，切向流速最大值点也不断向管中心一侧移动。

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There is also a stone under the waterfall, moving up and down with the water level.

在瀑布的下方有一块石头，随水位上下漂浮着。

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When dripping end flow increased, surface pond radius around drop increased, the moving distance in level of water increased, but the in leakage depth of water in vertical decreased;

随滴头流量增大，滴头周围地表积水区半径增大，水分在土壤中的径向运移距离增大，竖向入渗水量减少。

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