FIELD: construction.;SUBSTANCE: closed collector comprises a trench with an inclined bottom, a perforated pipeline wrapped with a protective-filtering material and laid onto the trench bottom, and solid or interrupted filtering fill of the trench with a water-permeable material with filtration ratio higher than filtration ratio of soil that surrounds the trench, and entering the closed collector. In order to increase quality of arrangement of a longitudinal profile of the trench bottom by the mechanised method and to reduce volume of manual completion of its bottom to the bottom meeting the laid requirements, the average minimum inclination of the trench bottom along the entire length of the collector is accepted as equal to 0.006. At the same time the length of the closed collector is accepted depending on natural inclination of soil surface under specific conditions, but at least 50 m.;EFFECT: reduced sedimentation of drainage lines and demand for their washing, provides for reliable hydrological action of a closed collector in process of its operation of many years for at least the rated service life.;2 cl, 3 dwg
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