The landscape is marbled blue from countless swollen streams that aren’t even visible in the pre-flood image.

洪水前图片中几乎不可见的无数河流在洪水中上涨而呈现出大理石蓝。

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Under flood conditions, great amounts of topsoil are washed to receiving streams.

在洪水泛滥时，大量表层土壤被冲刷到承受的水流中。

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Expressions of streamwise deformation of open channel flood streams are obtained based on experimental data.

从试验资料的分析得到了明渠流洪水波沿程变形的表达式。

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It added that rivers and streams could rise and flood warnings and alerts may be issued.

BBC: Wales weather: Floods possible as heavy rain forecast