中文摘要：

基于堰流的测流原理,推求出矩形渠道自由跌水的流量理论计算公式,其中综合流量系数（m）可由明渠底坡（S）和糙率（n）共同确定,并针对6种明渠底坡（S）、2种糙率（n）进行了一系列模型试验。结果表明,矩形明渠量水堰过流顺畅,测流精确,综合流量系数m与S（1/2）/n存在线性关系,流量试验值与理论计算值吻合良好。

英文摘要：

Based on the analysis on principle of weir flow, the theoretical formula for the flow measurement in rectangular channel with free overfall was proposed. The coefficient of discharge correction was deter- mined by channel slope and channel roughness. A serial of experiments about flume were carried out with 9 kinds of channel roughness and 2 kinds of channel slope. The results showed that the flow through the weir was smooth, the discharge formula was concise and practical, and the relationship between flow coef- ficient m and was linear, the computational results correspond closely with the experimental results.