Software

This software release documents an open source spreadsheet that was developed by the USGS in 2007 and modified herein for general use for calculation of equivalent freshwater altitude at wells where the water quality data indicate the well is tapping brackish areas of an aquifer system. One example of this includes coastal wells in the diffusion/mixing or transition zone of the aquifer...

Software for generating reproducible load calculations for point source dischargers. Includes features to manage common data challenges such as duplicates, incompatible input tables, and missing nutrient concentration or effluent flow data.

MODFLOW 6 is presently the core MODFLOW version distributed by the USGS, but MODFLOW-2005 (the previous core version) is still actively maintained and supported. MODFLOW-2005 simulates steady and nonsteady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined.

SPARROW is a popular watershed modeling technique, distributed by the USGS, that estimates the amount of a contaminant transported from inland watersheds to larger water bodies by linking monitoring data with information on watershed characteristics and contaminant sources.

iRIC (International River Interface Cooperative) is a river flow and riverbed variation analysis software package which combines the functionality of MD_SWMS (Multi-Dimensional Surface-Water Modeling System), developed by the USGS, and RIC-Nays, developed by the Foundation of Hokkaido River Disaster Prevention Research Center.

USGS and the U.S. Environmental Protection Agency (EPA) have combined their SWSTAT and DFLOW software programs into a new tool for the low-flow anlaysis, the SWToolbox. As of May 2022, the SWToolbox has been superseded by the Hydrologic Toolbox.

The Groundwater Toolbox is a graphical and mapping interface for analysis of hydrologic data. It provides methods to estimate many of the components of the water budget for a hydrologic basin, including precipitation, streamflow, base flow, runoff, groundwater recharge and evapotranspiration. As of May 2022, the Groundwater Toolbox has been superseded by the Hydrologic Toolbox.

MODFLOW-GUI is a preprocessor and postprocessor graphical-user interface for preparing MODFLOW-96, MODFLOW-2000, MODFLOW-2005, MOC3D, MODPATH, and ZONEBDGT input data and viewing model output for use within Argus Open Numerical Environments (Argus ONE).

The Point-Source Load Estimation Tool (PSLoadEsT) provides a user-friendly interface for generating reproducible load calculations for point source dischargers while managing common data challenges including duplicates, incompatible input tables, and incomplete or missing nutrient concentration or effluent flow data. Maintaining a consistent method across an entire study area is...

The Surrogate Analysis and Index Developer (SAID) tool is a stand-alone tool to assist in the creation of ordinary least squares (OLS) regression models by providing visual and quantitative diagnostics to the user.

MF2KtoMF05UC is a program to convert MODFLOW-2000 files to MODFLOW-2005 and UCODE_2005 files.

MODFLOW Data Extractor is a program for extracting data from formatted and labeled MODFLOW head or drawdown files from MODFLOW-GWT concentration or velocity files.