The experimental setup was a sloping flume in the hydraulics laboratory of the National Institute of Technology, Kurukshetra (Haryana), India. The sloping flume's length, width, and depth were 4, 0.25, and 0.3 m, respectively. The sidewalls of the flume were transparent 10-mm thick acrylic plexiglass, and the bottom side was 10-mm thick steel iron supported by a jack, as depicted in Figure 2. Transfer of water from the aeration tank cum receiving tank to the flume is carried out by a centrifugal pump with a maximum volume flow rate of 6 l/s, and it is ensured that as far as possible, aeration in the water takes place only during the drop from the weir by the closed re-circulating arrangement. The water nappe is allowed to pass through and over the test weir, which is mounted at the downstream end of the flume and plunges into the aeration tank. A digital pointer gauge and a calibrated orifice meter are employed to record the flow depth and flow volume rate of water in the flume, respectively. Water depth in the tank is consistently upheld at more than or at best 80% of the drop height for every reading (Avery & Novak 1978). The azide modification procedure (American Public Health Association APHA and Water Environment Federation WEF 2005) was utilized to measure the D.O. The tank is filled with a fixed quantity of tape water to find the amount of oxygen transfer efficiency (OTE₂₀) of water in the aeration tank for a specific gabion weir. An assessed quantity of Na₂SO₃ with CoCl₂ is mixed to drop the D.O. potential of water in the tank down to around 1.5 mg/l (Kumar et al. 2021; Tiwari 2021), and some quantity of water is withdrawn at different levels of the water tank for measuring initial dissolved oxygen (C_upst). After that, the experimental test is started for an identified period, and meanwhile, it is made sure that the test device is run for a certain duration in such a manner that the aeration tank water D.O. level should be below the full saturation level (C_saturated) at the experiment temperature, T (°C) and the final dissolved oxygen level (C_downst) is then computed with the azide modification technique. The water temperature in the aeration tank during the experimental test is recorded utilizing a thermometer. The method is repeated for every run by using one traditional weir and five gabion weirs. The value of OTE₂₀ is then assessed. The test gabion weir is characterized by six exchangeable weirs with varying discharge per meter width (q), mean sizes of gabion materials (d₅₀), porosity (n), and 60 observations of gabion weir OTE are taken, and to cross-check the credentials of the dataset, some observations have also been repeated twice-thrice. The matrix of test observations is shown in Table 1.