由于采沙破坏了天然河床的平衡状态，可引起长距离河床整体下切，对已有跨河桥梁工程不利。
Because it destroyed the river equilibrium, sand excavation would cause river bed erosion in large scale, which is danger our to the structure across the river.
通过分析重庆江津白沙渗滤取水工程中渗透水水质表明，河水经过天然河床渗滤处理，其中的悬浮物质几乎可以被完全去除，并有较好的除菌效果。
River water of slight pollution and high turbidity was converted into seepage water by filter through which the suspended substance was removed, turbidity was depressed and bacteria reduced.
在电缆管道建成后，许可证持有人须用天然底土修复受影响的蚝涌溪流河床，使其回复原貌。
After cable duct construction, the Permit Holder shall reinstate the affected stream bed of Ho Chung River to its original conditions using natural substratum.
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