规定在稳定或缓慢变化的流量条件下，明渠（尤其是灌溉渠）中液体流量的测量方法。所使用的水槽设计为在自由流动和浸没条件下运行。

Specifies methods of liquid flow measurement in open channels (particularly in irrigation canals) under steady or slowly varying flow conditions. The flumes used are designed to operate under both free-flow and submergence conditions.