The purpose of research was to test the efficiency of water distribution facility at the Issyk-Ata Feeding Canal (IFC) in Chui region of Kyrgyzstan as well as to refine the hydraulic characteristics of division gate under full-scale conditions. To achieve this goal, natural studies of the structure were carried out. At the same time, experimental methods of hydraulic research on a natural object with further interpretation with mathematical statistics were implemented. The dependences of relative available pressure head on the water-withdrawal coefficient of the water distribution structure, which showed deviations of the actual values of the effective head from the model ones, not exceeding 6.5 % were obtained. The discharge coefficients determined during the research varied from 0.24 to 0.41 for different values of the Froude parameter and open side gates, and with an increase in Froude parameter the discharge coefficient decreases. It has been found that with a relative discharge water in the canal of the highest order more than 0.35 and the opening of side closures less than 0.24 or equal to this value, the division gate can be used as a stabilizer of discharge water flow. Investigations of the flow depths in the IFC in the influence zone of the water distribution structure showed a fairly symmetrical picture of the free water surface as regard to the longitudinal axis of the canal. The measured flow velocities in the IFC confirmed the sufficient uniformity in distribution of flow velocity structure behind the facilities. Velocity measurements in the Ivanovskoy canal at the water distribution structure outlet showed a symmetric (with a deviation of ± (3–6) %) in terms of the flow pattern relative to the channel axis. Before the turn of the Ivanovskiy Canal, the flow velocities near the canal starboard decreased at a relative discharge rate more than 0.35–0.38, which is explained by a change in the flow structure near the turn. Measurement of the flow rates behind the turn showed the presence of an oblique wave of disturbance, which can be eliminated by swievel facility reconstruction.
Key words: water distribution structure, canal, chute, turbulent flow, diversion gate, field studies, discharge and stabilizing capacity, velocity flow structure.
