而且检修也比较困难，只适用于下游无水或下游水位很低的情况。
What's more, repairing is a problem except when there is no water downstream or the water level downstream is very low.
下游水位越高，变化相同的上游水位时，轴向流速沿径向分布的变化程度越大。
The bigger the downstream water level, the outstanding of variation degree of axial velocity along radius distribution when upstream water level is same.
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。
With the upstream water level reducing and the downstream water level increasing, the highest tangent velocity also moving to the pipe center.
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