**Abstract**

The object of research is irrigation systems that are hydraulically connected to a large specialized agricultural complex for rice production, located in the lower part of the Kuban River basin and experiencing an acute shortage of water resources. In the last decade, rice irrigation area decreased by 50%. Calculation technology is proposed for water resources management of the Lower Kuban basin basing on integrated use of six models developed in Russia: hydrological and meteorological forecasts; simulation models of yield formation to calculate crops water demand; water balance models to develop water use schedules for irrigation systems; hydrodynamic models to calculate water use scenarios; optimization models to choose a trade-off Pareto management options; and statistical models to calculate yield losses depending on water resources deficit. This technology allows adopting optimal trade-off solutions online with the Lower Kuban water resources management in interests of agriculture.

**Keywords:** water resources management, rice irrigation systems, water scarcity, simulation modeling, the Kuban River
