The hydraulic characteristics of the flow are measured using tools such as flumes, in the design and evaluation of furrow irrigation systems. Proper use of these tools, such as their immersion while working, is one of the important executive points in this field; in this study, trapezoidal flumes are used to measure the intensity of input and output flow in furrow irrigation. The proper method of installing these flumes was investigated in this article. For this purpose, during 60 irrigation operations, the results showed that in order to create free flow conditions in these flumes, and not to affect the downstream and upstream current, as well as increasing the accuracy of measurements, in addition to installing flumes in all directions, trapezoidal flume should be installed at a height of at least about 4 cm above the furrow bed; according to the irrigation operations, the percentage of immersion in the installation of the flume at a height of 4 cm from the furrow bed was observed as standard (less than 70% immersion) in order to reduce the percentage of flow measurement error in different depths of water entering the flume. The results also showed that for ensuring free flow in trapezoidal flumes, the flume should be installed at a height of 4 cm or more above the furrow bed, provided the input ridges are strengthened and the end flume is measured to measure the inflow to the furrow. The output current of the furrow should be installed in the floor of the furrow along the bed to prevent the passage of current, provided that after the outflow flume, the furrow bed should be deeper in terms of free flow. Observance of the points and results obtained in this study in furrow irrigation systems prevents errors in flow measurement and consequently increases the accuracy in the design and evaluation of furrow irrigation systems.

在沟灌系统的设计和评估中，使用水槽等工具测量水流的水力特性。正确使用这些工具，例如他们在工作时的沉浸感，是该领域的重要执行点之一；在这项研究中，梯形水槽用于测量沟灌中输入和输出流量的强度。本文研究了安装这些水槽的正确方法。为此，在 60 次灌溉作业中，结果表明，为了在这些水槽中创造自由流动条件，并且不影响下游和上游水流，以及提高测量精度，除了在所有水槽中安装水槽方向，梯形水槽应安装在沟床以上至少4厘米左右的高度；根据灌溉作业，在距离沟床 4 cm 高处安装水槽的浸水百分比作为标准观察（小于 70% 浸水），以减少不同深度的流量测量误差百分比进入水槽的水。结果还表明，为保证梯形水槽内的自由流动，水槽应安装在沟床上方4厘米或更高的高度，前提是加强输入脊并测量末端水槽以测量到沟的流入量。 . 沟的输出电流应安装在沟床沿床的沟底，以防止电流通过，前提是出水槽后沟床应较深，以自由流动。