Both the influent organic concentration and HRT have effect on hydraulic characteristics, and the former is the main factor.
进水有机物浓度及HRT对水力流态均有影响，而前者为主要因素。
As the concentration of the influent increases, the removal of the same percentage of BOD will require additional facilities.
当进水浓度提高时，去除同样百分比的BOD则需要加大设备。
When a foundation pit is excavated in high water level, groundwater may cause drift sand and slope failure due to the influent from seepage.
在地下水位较高的地区开挖基坑时，地下水会不断渗入基坑，容易造成流砂和边坡失稳。
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