The tendency and changes of water quality and pollution in the reservoirs are projected.
对污染趋势和水质变化进行了分析和预测；
Some of this water may be returned to the original source with changes in the quantity and quality of the water, but some may be used consumptively.
这种水有些经过水量和水质的处理，重新回到原来的水源地，有一些则被消耗掉了。
Based on a great amount of historical data to analyze the evolution of Guangzhou reach of Pearl River and the changes of water environmental quality qualitatively and quantitatively.
通过大量的历史数据，对珠江广州河段的演变和水环境质量的变化作了定性、定量分析。
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