流量和水位是灌溉渠道水流流动的基本特征参数，是灌区水管理者进行调度决策的依据。标准断面量水法或者均匀流公式是最常见的方法，在上下游条件变幅较大或者变化频繁的情况下，标准断面量水法中采用的公式和均匀流公式不再适用。本文提出了两点水位量水法，在灌溉渠道上沿程选择两个断面，实时测量断面的水位变化，通过求解水流控制方程得到断面的流量。计算结果表明，与均匀流公式相比，基于两点量水法可以提高流量监测的精度。

Discharge and water level are the basic characteristic parameters of water flow in irrigation channels, which is the basis of water managers making scheduling decision in irrigation area. The standard section method or uniform flow formula is the most common method in the measurement of discharge, but they are no longer applicable in the case where the upstream and downstream conditions vary greatly or frequently. In this paper, a two-point water level method was proposed. Two sections were selected along the irrigation channel, and the instant water level of each section was measured. The discharge of the channel was obtained by numerical simulation. The results showed that compared with the uniform flow formula, the two-point water method can improve the accuracy of flow monitoring.