通过试验发现就环状橡胶圈（模拟废旧轮胎）这种柔性加糙体，垂直水流方向的投影面积是影响槽底糙率、水深和流速的主要因素。

By the testing we found the flexible artificial roughness rubber turns which simulated the wasted tires were the main factor which affect the roughness of the bottom which directed to vertical flow.

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可以垂直安装或者水平安装，但是安装时要使得箭头指向水流方向。

You may install the regulator vertically or horizontally, but you must install it with the arrow in the direction of flow.

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可以安装在水平位置或水流方向朝上的垂直位置。

Can be installed in both the horizontal or vertical positions, provided fluid flow is upward.

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