Keywords: drainage system, geotextile, drainage runoff, soil, agricultural drainage, filtration

// Мелиорация.– 2021. – №3(97) – P 13–21

 The article analyzes the main factors affecting the efficiency of drainage systems, establishes the nature of the change in the filtration coefficient of the drainage backfill in time. The necessary performance of drainage systems is given to ensure the required drainage rates. The influence of the initial moisture content of the drainage backfill on its water permeability has been investigated. It is concluded that it is inexpedient to build drainage and humidification systems in the presence of clay or loamy soils in the zone of subsurface moisture, which, when soaked, form a weakly water-permeable layer in the trench backfill.