The study is devoted to one of the most topical and insufficiently covered up to the present time questions - the exact determination and especially the forecasting of losses in the capacity of channel reservoirs and the question of sediment deposition in irrigation and power reservoirs. Improvement of technological operation of structures and reservoirs and consideration of the methodology for determining and forecasting the volume of siltation of the Orto-Tokoi reservoir, Kambar-Ata 2 Our country strives for integrated use of water resources in Kyrgyzstan. This work will give an impetus to the development of water efficiency "water footprint", rational agriculture, the link between water and energy resources also contributes to the development of economic efficiency of water use not only in this area also in the territory of the republic. In addition, under the conditions of market relations and land reform in the republic, means of regulating water flow parameters should have water-measuring properties.