Boundary conditions for the classical solution of the Terzaghi one-dimensional consolidation equation conflict with the equation’s initial condition. As such, the classical initial-boundary value problem for the Terzaghi one-dimensional consolidation equation is not well-posed. Moreover, the classical boundary conditions of the equation can only be applied to problems with either perfectly pervious or perfectly impervious boundaries. General boundary conditions are proposed to overcome these shortcomings and thus transfer the solution of the Terzaghi one-dimensional consolidation equation to a well-posed initial boundary value problem. The solution for proposed general boundary conditions is validated by comparing it to the classical solution. The actual field drainage conditions can be simulated by adjusting the values of parameters b and c given in the proposed general boundary conditions. For relatively high coefficient of consolidation, just one term in series expansions is enough to obtain results with acceptable accuracy. Boundary conditions for the classical solution of the Terzaghi one-dimensional consolidation equation conflict with the equation’s initial condition. As such, the classical initial-boundary value problem for the Terzaghi one-dimensional consolidation equation is not well-posed. Moreover, the classical boundary conditions of the equation can only be applied to problems with only or enough pervious or perfectly impervious boundaries The solution for proposed general boundary conditions is validated by comparing it to the classical solution conditions. just one term in series expansions is enough to obtain results with acceptable accuracy.