Gradient of liquid level increases with the increase of liquid flow and the height of weir.
液面梯度随液体流量的增加而增加，随堰高的增加而增大。
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；
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