Its shortcomings include harsh restriction for suspended solid in influent, low phosphorus removal efficiency, high water-head loss and the height of lifting sewage.
但同时也存在对进水悬浮物要求较高，磷去除率低，水头损失大，污水提升高度大等问题。
The experimental results indicated: grid ceiling affects the water distribution significantly, related with installation height of sprinkler head and water pressure.
研究结果表明：格栅会严重改变自动洒水喷头的水量分布，其影响与喷头的安装高度和工作压力有关。
The influence of water temperature on water head height becomes bigger as the well depth increases. The pressure at the well bottom has to be measured by instruments in the well.
随着井深增加，水温对水头高度的影响越来越大，需要采用下井仪器测量井底压力。
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