In this paper we study the operation of a field of wells (drums), which draws water from an aquifer free, working steady. The method of calculating equations are proposed hydro wells. There is a system of linear equations, which provides drops in each well. By application of the method to the case of a battery of 32 wells located in the Administration Farias of the Casa Grande Agroindustrial Company SAA, in which soon will be drilling tube wells for the extraction of groundwater. They are necessary definitions on terms attached to this work, and which is presented in the introductory part. We need to work as field measurement of levels, aforos, pumping tests and sondajes electric. We found the hydraulic parameters, which we assume with sorne values for the entire area, but for more accuracy was flat INRENA to confirm and support their values. We determined whether there was interference ...