Hydraulic Calculation Methodology for Group Well Water Intakes with Paired Prefabricated Water Pipelines

For domestic and drinking water supply for cities and large industrial enterprises, group well water intakes are widely used, in which prefabricated water pipelines are designed to transport water from wells to collection points. The choice of the optimal layout of prefabricated water pipelines is determined after technical, economic and hydraulic calculations of the entire water intake, taking into account the characteristics of wells and deep-well pumps installed in them, and the parameters of all pressure pipelines. Hydraulic calculations are based on a developed mathematical model of water intake, which should provide reliable data on pump flows, drops in water levels in wells, flow rates and pressures in the collecting water pipeline system for any number and combination of operating wells. This allows for the correct selection of pumps and reduces energy costs for lifting and transporting water. The article is devoted to the development of a methodology for hydraulic calculation of group well water intakes with paired collection water pipelines, which are used at high-capacity water intakes in water supply systems with a high degree of water supply security. The difficulty in calculating such water intakes lies in the fact that here each well simultaneously supplies water to two strings of collecting water pipelines, which distinguishes this scheme for supplying water to a collecting unit from other standard schemes. The article presents calculation schemes and an algorithm for hydraulic calculation of group water intake, which is considered as a system with non-fixed water supplies. The calculation algorithm is based on taking into account the balance of pressures in water pipelines with pumps included in them and the balance of flow rates in nodes for all sections of prefabricated water pipelines. A computer program has been developed and the results of a numerical calculation of groundwater intake, equipped with paired prefabricated water pipelines and consisting of 15 wells, are presented.