截水环：防止集中渗流，在外围设置，以改变水流方向，增加渗径，减小渗流。
Section water ring: prevent concentration in the peripheral Settings, seepage, to change the direction of flow, increasing permeability diameter, reduce the seepage.
截水环：防止集中渗流，在外围设置，以改变水流方向，增加渗径，减小渗流。
Section water ring: prevent concentration in the peripheral Settings, seepage, to change the direction of flow, increasing permeability diameter, reduce the seepage.
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