METHOD TO IMPROVE OPERATIONAL RELIABILITY OF CLOSED HORIZONTAL PIPE DRAINAGE WHEN IMPLEMENTING PRECISE AGRICULTURE Russian patent published in 2014 - IPC E02B11/00 

FIELD: construction.

SUBSTANCE: method consists in coupling a drain line with a closed manifold, which is carried out according to the filling h of a pipe of the closed manifold below the coupling assembly to 2d_dl when the estimated flow is passing. In this case the following conditions are taken into account: at h≤0,5(d_cm-0,6d_dl) coupling is performed end-to-end centrally, at (d_cm+t_dl)-(0,6d_dl+_dl)≥h>0,5(d_cm-0,6d_dl) coupling is performed end-to-end "semi-above", at d_cm≥h>(d_cm+t_dl)-(0,6d_dl+t_dl) coupling is overlapped, where d_cm and d_dl - internal pipe diameters in the coupling assembly of the closed manifold and the joined drain line respectively, t_cm and t_dl - pipe thickness in the coupling assembly of the closed manifold and the joined drain line respectively. In this case the length of the joined drain line doesn't exceed its maximum allowable length.

EFFECT: long-term service life of the coupling assembly of the drain lines and reliable hydrological effect of subsurface drainage during service for at least the standard service life, as a result of which the design intensity of the soil drainage and expanded reproduction of its fertility is provided during this period.