MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- Documentation of the Model-Layer Variable-Direction Horizontal Anisotropy (LVDA) capability of the Hydrogeologic-Unit Flow (HUF) package

Abstract

The Model-Layer Variable-Direction Horizontal Anisotropy (LVDA) computer software described in this report is a new capability of the Hydrogeologic-Unit Flow (HUF) Package for MODFLOW-2000, the U.S. Geological Survey's three-dimensional ground-water flow parameter-estimation model. The software is designed to allow the primary axes of horizontal anisotropy to be oriented in directions other than along grid axes. The documentation presented here describes the methods used, the required new input file, the changes in how two parameter types in the HUF Package are used, and the output related to the new LDVA capability.