National Research Program
USGS Hydrologic and Geochemical Models
The USGS has been a leader in the development of hydrologic and geochemical simulation models since the 1960's. USGS models are widely used to predict responses of hydrologic systems to changing stresses, such as increases in precipitation or ground-water pumping rates, as well as to predict the fate and movement of solutes and contaminants in water. Today, USGS models are available for free on the internet.
See http://water.usgs.gov/software/ to obtain software, which has been grouped into the following categories: Geochemical, Ground Water, Surface Water, Water Quality, General.
See http://water.usgs.gov/nrp/gwsoftware/ to obtain some of the newest USGS computer software, designed to model various ground-water and related hydrologic and geochemical processes and to help estimate related parameters.
See http://wwwbrr.cr.usgs.gov/projects/SW_MoWS/software/oui_and_mms_s/installation.shtml to download the Modular Modeling System (MMS) software, a set of modeling tools that provide a framework that can incorporate a variety of models and thus create an "optimal" model to be used, for example, in watershed management. A beta version of the Object User Interface (OUI), a computer application developed to provide the general framework needed to couple disparate environmental resources models and manage the necessary temporal and spatial data, is also available.
See http://wwwbrr.cr.usgs.gov/projects/GEOMORPH_Lab/cap-model.html for models and information related to modeling flow, sediment transport, and bed evolution in a wide variety of situations.
Use the USGS Surface-water quality and flow Modeling Interest Group (SMIG), to network with other surface-water modelers, keep abreast of current surface-water modeling activities in the USGS, discuss new modeling techniques, algorithms, interfaces, and learn about new models.
Software and related material (data and documentation) are made available by the U.S. Geological Survey (USGS) to be used in the public interest and the advancement of science. You may, without any fee or cost, use, copy, modify, or distribute the software, and any derivative works thereof, and its supporting documentation, subject to the USGS software User's Rights Notice.