This research conducted to study the flow through a rectangular cut-throated flume (RCTF). The flume is simply formed by placing two vertical triangular prisms (two vertical folded plates) on either side of a rectangular open channel. Both channel and flume cross-sections are rectangular. The investigated flume is inexpensive, easy to install and does not require high maintenance. A wide experimental investigation, carried out under free outflow conditions and under upstream subcritical flow regime to investigate the effects of the channel longitudinal slope, the flume throat width, and slopes of upstream and downstream flume walls on the stage-discharge relationship. The stage-discharge relationships were deduced by applying the dimensional analysis and were calibrated using the data of this study. The proposed stage-discharge equation for horizontal channel has an average absolute relative error of 2.97% with the relative errors restricted in the range of ±10%, and 80% of the data points are in the error range of ±5%. The proposed stage-discharge equation for sloping channel has an average absolute relative error of 3.97% with the relative errors restricted in the range of ±10%, and 66% of the data points are in the error range of ±5%. The measurements indicate that slopes of upstream and downstream walls affect the stage-discharge relationship of the CTFs only in sloping channels and flow discharge is not influenced by the flume walls slopes in a horizontal channel. The proposed unified stage-discharge equation for both horizontal and sloping channels has an average absolute relative error of 3.38% with the relative errors restricted in the range of ±10%, and 74% of the data points are in the error range of ±5%. The proposed stage-discharge model demonstrates favorable accurate and convenient estimation of discharge for flows through the CTFs.

这项研究旨在研究流经矩形切喉的水槽（RCTF）的流量。通过将两个垂直的三角棱镜（两个垂直的折叠板）放置在矩形开放通道的两侧，即可简单地形成水槽。通道和水槽的横截面均为矩形。所研究的烟道价格便宜，易于安装且不需要高维护成本。在自由流出条件下和上游亚临界流态下进行了广泛的实验研究，以研究通道纵向斜率，水槽喉宽以及上游和下游水槽壁的斜率对级-流量关系的影响。通过应用尺寸分析推导出阶段-放电关系，并使用本研究的数据进行校准。所提出的水平通道的阶段放电方程式的平均绝对相对误差为2.97％，相对误差限制在±10％的范围内，而80％的数据点的误差范围在±5％内。所提出的斜通道分级放电方程的平均绝对相对误差为3.97％，相对误差限制在±10％范围内，而66％的数据点的误差范围在±5％之内。测量结果表明，上游壁和下游壁的斜率仅在倾斜通道中影响CTF的级-流量关系，而流量排放不受水平通道中壁槽壁斜率的影响。所提出的水平和倾斜通道的统一的阶段放电方程均具有3的平均绝对相对误差。38％的相对误差限制在±10％的范围内，而74％的数据点的误差范围在±5％内。拟议的阶段排放模型证明了流过CTF的流量有利于准确，方便地估算。