A comparative evaluation of the existing formulas for calculating the flow rate of imperfect wells in a confined aquifer is given on the basis of analysis of experimental data obtained during hydrogeological studies in a valley filled with alluvial sediments to which the confined aquifer is confined. Alluvial deposits of the valley are represented mainly by variably grained sands, partly silty and clayey, with gravel, pebbles and single boulders. The total thickness of alluvial formations overlying Tertiary sediments is 40‑42 meters. The upper part of the alluvium is composed of clays and loams up to 13 m thick, which is a confining layer. The head reaches 12.79 m, counting from the roof of the aquifer. The level of this horizon is subject to seasonal fluctuations. The minimum level position is observed in autumn (0.21‑0.95 m below the ground surface), the maximum — in spring, when the water level rises 0.35‑0.83 m above the ground surface, as a result of which some wells flow spontaneously during this period.

To determine the flow rate of imperfect wells under confined water conditions in hydrogeological practice, a number of formulas proposed by P. P. Argunov, G. N. Kamensky, I. Kozeny, M. Masket and others are used. As is known, calculations using these formulas are relatively time‑consuming and often difficult for average technical personnel. The proposed accelerated method considerably facilitates calculation of the flow rate of imperfect wells under confined water conditions and is quite accessible to a wide range of specialists engaged in the study of confined water for water supply purposes. The accelerated method is based on the formula of Prof. P. P. Argunov.

The issue of interaction of hydrogeological wells for groundwater was studied by Soviet scientists P. P. Kusakin [3], M. E. Al'tyuvskiy [1], P. P. Argunov [2] and others. They proposed a number of formulas, which are mainly used by hydrogeologists at present. However, these formulas, as is known, require quite a lot of time for calculations and in some cases do not give the desired results. This article briefly describes a new method for calculating the productivity of interacting wells drilled in an alluvial ground flow. Based on the obtained materials on wells located normally to the alluvial flow, a new empirical formula for calculating interacting wells is proposed. To derive the recommended formula, we will first provide a brief hydrogeological description of the water intake site.