To ensure the safety of the dam, countermeasures including low water-level operation of the dam and sluicing-siltationmethod with coal ash in front of the dam were presented.
以闸前常水位运行渠道为例，设计了水位-流量串级控制器，对其传递函数进行了分析，给出了串级反馈控制器的设计准则。
Following normal operation, the reservoir's level dropped as water was released downstream during the winter and early spring 2008 and was at a low level when the Wenchuan earthquake occurred.
水库正常运转以后，因为在冬季和2008年春天早期的时候向下游放水，水库水位一直在下降。而汶川地震发生的时候，水库正处在一个低的水位上。
Device features: high softening rate, low outlet water hardness, simple and convenient regeneration and operation, high automation level.
装置特点：软化效率高、出水硬度低、再生操作简单方便、自动化程度高。
Device features: high softening rate, low outlet water hardness, simple and convenient regeneration and operation, high automation level.
装置特点：软化效率高、出水硬度低、再生操作简单方便、自动化程度高。
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