This software and related material (data and (or) documentation) are made available by the U.S. Geological Survey (USGS) to be used in the public interest and in the advancement of science. Water resources applications software is listed alphabetically and grouped into the following categories: Ground Water, Surface Water, Water Quality, General Use, Statistics & Graphics. If you want to use, copy, modify, or distribute this software, and any derivative works thereof, and its supporting documentation, please read the USGS software User Rights Notice. This web site provides information about software introduction, software download, software registration, etc.