International Journal of Engineering, Science and Mathematics Vol. 6 Issue 8, Decemer 2017, ISSN: 2320-0294 Impact Factor: 6.238 Journal Homepage: http://www.ijesm.co.in, Email: ijesmj@gmail.com Double-Blind Peer Reviewed Refereed Open Access International Journal - Included in the International Serial Directories Indexed & Listed at: Ulrich's Periodicals Directory ©, U.S.A., Open J-Gage as well as in Cabell’s Directories of Publishing Opportunities, U.S.A 53 International Journal of Engineering, Science and Mathematics http://www.ijesm.co.in, Email: ijesmj@gmail.com LIMITATIONS FOR OPTIMIZED PARAMETERS OF THE SITES OFINTERACTION OF RESERVOIRS WITH PRESSURE NETWORKS FOR WATER SUPPLY SYSTEMS SALOKHIDDINOV ABDULKHAKIM TEMIRKHUJAEVICH – Professor, Doctor of Technical Sciences Tashkent Institute of Irrigation and Agricultural Mechanization Engineers SAVITSKY ANDREI GEORGIEVICH– PhD, Uzgidroproekt ASHIROVA OLGA ALEKSANDROVNA - researcher Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Abstract Results of the studies of parameter optimization problems for water supply systems are given in the paper. The research results allowthe specialists to define the limitationsfor optimized parameters of water supply systems for practical calculations. The limitations for optimized parameters have been defined for the interaction site ofreservoir and pressure network.The paper proposes a formula to calculate the limitations on resistance coefficient for supply water passage to reservoir. Under these limitations the planned use of reservoir capacity and the stability of computational process are ensured. Introduction. In the Republic of Uzbekistan a great attention is paid to the improvement of water resources management and water supply and water use systems. Sustainable socio-economic development is not possible without a sustainable water supply system. Growing volumes of water consumption and deterioration of water quality under the influence of natural and anthropogenic factors are worldwide problems, burdened by water scarcity. The Republic of Uzbekistan is no exception. At the same time with the growth of settlements the new sites are connected to existing water supply networks. In practice, this sometimes leads to a significant deterioration ofwater supply systems,previously well- functionedones [1]. As the results of analysis show one of the main causes of such poor state is an insufficient development of the methods of calculation of water passages, which are used in such conditions;they do not allow to determine the optimal network parameters to meet the requirements or their optimal reconstruction under new mode of operation. Currently, the operation of utilities is mostlyaffected by inner wear of existing networks and facilities, communications and equipment, limitations related to the conditions of the availability of water resources and indeterminacy of water use regime. The authors of the paper have developed a search system: for optimal parameters of water supply networks at project stage and search of options for optimal reconstruction of existing water supply networks [2,3]. But there appeared an opportunity to improve the computing power of the system. This paper is devoted to realization ofthis opportunity.