Method for obtaining water retention properties of soils by fractions of their granulometric composition

This paper presents the method of obtaining water retention properties soils (water curve (WRC) and conductivity functions) is presented. These properties, or functions, allow describing vertical movement in unsaturated as one components balance expenditure item. They are widely used during substantiation reclamations modelling transfer soil. The based on laboratory studies soil samples taken field for granulometric composition. Currently, results analyses Ukraine obtained according to Kachynskyi with two components, percentage clay sand. transformed graphically, using integral (cumulative) curves, into data corresponding international classification – three components: content sand, dust, clay. world community scientists uses latter factional distribution. Therefore, clay, thanks open access computer program “Rosetta” USDA (United States Department Agriculture), found form constants (total content, minimum hygroscopic filtering coefficient), coefficients equations Van Genuchten’s mathematical model. provides examples calculating dark chestnut ordinary chernozems. advantages proposed include low complexity experimental studies, availability presence many composition soils, including literature sources. As a development research area, author showed application dependencies reclamation (irrigation irrigation control systems). future areas, publication suggests comparing accuracy various methods, well an important constant capacity (MSWC)