Efficiency of a siphon drainage system under conditions in a low gradient area

Abstract

The drainage system designs and their function principles at the experimental production plot for the siphon- and vacuum-assisted drainage in the Mugan-Salyan massif characterized by the nongradient area have been described. The surveys are carried out in the natural environments during the vegetation period for the irrigation of cotton occupying the entire area of the experimental plot. A high efficiency of the siphonand vacuum-assisted drainage system has been calculated. In addition, the drain discharge and the discharge module are closely connected to the existing water pressure value in the interdrain. In the vegetation period, the maximum and minimum water discharges comprised 11.1 L/sec and 2.8 L/sec, respectively. The drainage module value varied from 0.14 to 0.55 L/sec hectare. It has been ascertained that the drainage system operation provides the opportunity to lower the depth of the groundwater table within the interdrain up to 250–280 cm (the initial depth is 120–150 cm). The possibilities of significant increases in the flushing intensity and the reduction of the terms of the regulated ameliorative activities within the certain hydrogeological regime have been proven.