"We store and reuse most of the water, so only a small amount is filtered and discharged into the river," Wei said.

“我们储存和重复使用大部分的水，所以只有一小部分被过滤后排入河里，”魏映彦说。

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The results showed that the Wei river as to be irrigation water didn't produce pollution to agriculture production.

研究结果表明：渭河水作为灌溉水源，对农业生产还没有产生污染；

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Aimed at actual question of water quality assessment, the BP neural network model is established which synthetically assesses the surface water quality of the Wei river.

针对实际水质评价问题，建立了渭河地面水环境质量综合评价的BP神经网络模型，并与单因子法、主成分分析法进行了分析比较。

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