Technology & Engineering

This report describes shared node Local Grid Refinement (LGR) for MODFLOW-2005, the U.S. Geological Survey's three-dimensional finite-difference ground-water model. LGR is designed to allow users to...

GENIE is a model-independent suite of programs that can be used to generally distribute, manage, and execute multiple model runs via the TCP/IP infrastructure. The suite consists of a file...

The drainage basin is a fundamental hydrologic entity used for studies of surface-water resources and during planning of water-related projects. Numeric drainage areas published by the U.S...

This report describes the Groundwater-Management (GWM) Process for MODFLOW-2005, the 2005 version of the U.S. Geological Survey modular three-dimensional groundwater model. GWM can solve a broad...

Many groundwater-management problems are concerned with the control of one or more variables that reflect the state of a groundwater-flow system or a coupled groundwater/surface-water system. These...

This report is designed to calculate simulated equivalents for observations related to advective groundwater transport that can be represented in a quantitative way by using simulated particle...

The SWI2 Package is the latest release of the Seawater Intrusion (SWI) Package for MODFLOW. The SWI2 Package allows three-dimensional vertically integrated variable-density groundwater flow and...

Many groundwater wells are open to multiple aquifers or to multiple intervals within a single aquifer. These types of wells can be represented in numerical simulations of groundwater flow by use of...

This report documents the Multi-Model Analysis (MMA) computer code. MMA can be used to evaluate results from alternative models of a single system using the same set of observations for all models...

A Soil-Water-Balance (SWB) computer code has been developed to calculate spatial and temporal variations in groundwater recharge. The SWB model calculates recharge by use of commonly available...

The ability to dynamically simulate the integrated supply and demand components of irrigated agricultural is needed to thoroughly understand the interrelation between surface water and groundwater...

This report documents a Newton formulation of MODFLOW-2005, called MODFLOW-NWT. MODFLOW-NWT is a standalone program that is intended for solving problems involving dying and rewetting nonlinearities...

A New evapotranspiration package for the U.S. Geological Survey's groundwater-flow model, MODFLOW is documented in this report.Author: Kathryn J. BairdPublisher: Createspace Independent Publishing...

A numerical model for simulation of surface-water integrated flow and transport in two (horizontal-space) dimensions is documented. The model solves vertically integrated forms of the equations of...

This user's manual describes the Middle Mississippi River Decision Support System (MMRDSS) and gives detailed examples on its use. The MMRDSS provides a framework to assist decision makers regarding...

OTEQ is a mathematical simulation model used to characterize the fate and transport of waterborne solutes in streams and rivers. The model is formed by coupling a solute transport model with a...

This document describes the OPR-PPR computer program, which evaluates the importance to model predictions of one or more existing or potential observations, or of increased knowledge about one or...

The TSPROC (Time Series PROCessor) computer soft- ware uses a simple scripting language to process and analyze time series. It was developed primarily to assist in the calibra-tion of environmental...

The application bgaPEST is a highly parameterized inversion software package implementing the Bayesian Geostatistical Approach in a framework compatible with the parameter estimation suite PEST...

Although there are various methods for restricting access to documents stored on a World Wide Web (WWW) site1 (a Web site), none of the widely used methods is completely suitable for restricting...

Although there are various methods for restricting access to documents stored on a World Wide Web (WWW) site1 (a Web site), none of the widely used methods is completely suitable for restricting...

Management of sand and finer sediment in fluvial settings has become increasingly important for reasons ranging from endangered-species habitat to transport of sediment-associated contaminants. In...

The purpose of the Reston Stable Isotope Laboratory (RSIL) lab code 1800 is to determine the (34S/32S), abbreviated as 34S, of total sulfur in a solid sample. A Carlo Erba NC 2500 elemental analyzer...

Legacy geochemical and locality data for 414,304 rock, 397,625 soil and stream sediment, and 335,547 water samples acquired over the 100-year history of the U.S. Geological Survey are digitally...

Natural hazards pose significant threats to the public safety and economic health of many communities through- out the world. Community leaders and decision-makers continually face the challenges of...

Analysis of the uncertainty associated with parameters used by a numerical model, and with predictions that depend on those parameters, is fundamental to the use of modeling in support of...

The mission of the US Climate Variability & Predictability (CLIVAR) Program is: To foster understanding and prediction of climate variability and change on intraseason- al-to-centennial timescales,...

This document describes the air quality modeling performed by EPA in support of the Tier 3 motor vehicle emission and fuel standards. A national scale air quality modeling analysis was performed to...

Saving energy through energy efficiency improvements can cost less than generating, transmitting, and distrib- uting energy from power plants, and provides multiple economic and environmental...

A Human Well-being Index (HWBI) has been developed for the U.S. to help inform and empower decision makers to weigh and integrate human health, socio-economic, environmental and ecological factors...