六百多万人仍然没有与任何排污管道相连接(主要原因是他们住在非法的房屋聚点)，他们的污水流进了排水明沟。
More than 6 million people remain unconnected to any sewer line (mainly because they live in unauthorized housing settlements), and their wastewater flows into open drains.
建立截流龙口附近的水流数学模型，多采用平面二维模型。
In establishing current mathematical model near the closure gap, two-dimensional model is usually adopted.
为了有效地模拟跨越多个尺度的非均质多孔介质中的非饱和水流问题，本文提出一种自适应多尺度有限元方法。
The purpose of this method is to obtain the large-scale solution of unsaturated water flow equation with heterogeneous coefficients accurately and efficiently in a coarse-scale mesh.
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