[en] 1 - Description of program or function: NORIA is a finite element program that simultaneously solves four nonlinear parabolic, partial differential equations that describe the transport of water, water vapor, air, and energy through partially saturated porous media. NORIA is designed for the analysis of two-dimensional, non-isothermal, unsaturated porous flow problems. Nearly all material properties, such as permeability, can either be set to constant values or defined as functions of the dependent and independent variables by user-supplied subroutines. The gas phase is taken to be ideal. NORIA is intended to solve nonisothermal problems in which large gradients are expected in the gas pressure. 2 - Method of solution: NORIA uses the standard Galerkin finite element method to handle spatial discretization of two-dimensional domains with either planar symmetry of axisymmetry. Time integration is performed by a third-order predictor-corrector scheme coupled with Newton iteration that uses error estimates to automatically adjust time-step size so as to maintain uniform local time truncation error throughout the calculation. An Adams-Bashforth' predictor is combined with a Crank-Nicolson corrector step for each time-step after the initial two. Four basic finite element types are available in NORIA: iso-parametric 8-node quadrilateral, sub-parametric 8-node quadrilateral, iso-parametric 6-node triangle, and sub-parametric 6-node triangle