Water system changes, reclaiming farmland from lakes, etc, made a serious threat to flood and waterloggingcontrol.
水系格局改变、围湖造田等这对于防洪除涝造成严重威胁。
2
The economic evaluation in selection of design standards for waterloggingcontrol had never been proceeded all over the county.
排涝设计标准的选择，各地大都没有进行经济比较论证，都是凭经验确定。
3
But after waterlogging treated for two or three days, there was significant difference between the control and the treatment, the high growth had been restrained obviously.