针对雨水口及其他跌落水流的流量测量问题,提出一种基于动量变化率而测定来流冲击力的计量流量的方法。具体步骤是通过力传感装置和称重变送器将下落水流冲击力转化为电压信号,依据率定实验过程中电压值的变化,最终换算成雨水口径流流量。结果表明,应用该计量方法进行雨水口流量测量,其获得的流量精度较高,适应雨水口的流量变化,是一种计量雨水口流量的有效方法。 Aiming at the flow measurement problem of the gullies and other falling water flows, a method of measuring the flow rate of the incoming impact force based on the rate of change of momentum was proposed. The specific step is to convert the impact force of the falling water flow into a voltage signal through the force sensing device and the weighing transmitter, and then determine the change in the voltage value during the experiment and convert it into the runoff of the rainwater port. The results show that using this measurement method to measure the flow rate at the gully, the accuracy of the obtained flow rate is relatively high, and it is an effective method for measuring the flow rate at the gully outlet.