ECONOMIC FEASIBILITY OF REPEATED WATER USE ON AGRICULTURAL IRRIGATED FIELDS
Collector and drainage water from irrigation systems forms a significant amount of water that may be reused. The economic effect of water reuse is determined by fresh water saving and the expansion of irrigated area and, ultimately, additional agricultural products. The effectiveness of water reuse is compared with the conventional single-use under the same initial conditions. The projected yield and cost of crop production is adopted for the conditions of the Rostov Region. The approbation of the proposed technique in the Aksay Irrigation System has shown that the forecasted total annual efficiency of this water reuse will enable to make a profit of more than 3.0 million rubles and reduce irrigation diversion from surface and underground water sources by an average of 15%. The proposed technique makes it possible obtaining adequate economic feasibility of repeated use of collector, drainage and surface water for irrigation purpose. In addition to the proposed technique of economic effect, there is an environmental component of water reuse due to decreased discharge of collector, drainage and surface water to water sources and the entry of such pollutants as pesticides and fertilizers.