A method of forming one-dimensional networks that are equivalent to two-dimensional wave propagations with fluid-structure interactions was developed. The method was verified by analysis of the simple shaker for a computational experiment by the use of the MULTIPLEX code for one-dimensional hydraulics with fluid-structure interactions. By applying the method of network formation, the Fritz-Kiss experiment was subsequently analyzed. In the latter case, the computed in-water frequency was 17.39 Hz, in good agreement with the measured value, 17.0 Hz. Thus, the MULTIPLEX code was verified for analyses of two-dimensional systems with application of the network model.