The preventive measures should meet the requirements of the gradient of water table and the condition of water circulation.

防渗处理应满足于对地下水比降、水交替循环条件等方面的要求。

youdao

Ultrasonic liquid level gauge used to real-time measure the upper level and tail level of the two sections , then the computer calculated average water level, gradient of water table and discharge;

用超声波液位计将测流渠段的上下游两断面水位实时测出，再用计算机分时段算出平均水位、水面坡降及流量；

youdao