As part of an interdisciplinary analysis of the economic evaluation of the water resources of the Rio Grande Region of New Mexico, a conjunctive use surface water-ground water simulator was developed. The simulator was used to determine the dynamic availability of ground water and its relationship to flow in the Rio Grande.

This report gives an account of the structure and use of the simulator. It is a computer model in which the governing nonlinear parabolic partial differential equation, used to simulate unconfined aquifer flow in two dimensions, was solved by implicit finite differences. The set of difference equations in residual form are solved by LSOR or Gauss Elimination depending upon the size of the problem.

Project No. A-045-NMEX