介绍堰式和槽式明渠流量计的测量原理，提出了一种新的堰式流量计算公式。
The measuring principles of weir and flume open channel flowmeters are introduced and a new calculation formula for weir flowmeter is stated.
实验结果表明槽式孔板测量误差小于5%，研究结果对槽式孔板流量计的开发具有一定借鉴意义。
Experimental results indicated that maximum error of slotted orifice is less than 5%. The conclusion is available to the development of slotted orifice meter.
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