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Climate change and it's impact on watersheds and water quality is an primary concern of resource managers at the regional, state, and federal level. This presentation provides a high-level overview of EPA water quality modeling projects and tools in the context of climate change....

EPANET, EPANET-MSX and the Water Network Tool for Resilience (WNTR) are powerful modeling tools for water distribution system modeling. This presentation highlights a range of work associated with these tools to provide real-world examples of how EPANET and associated tools are u...

 Increased nutrient loading to coastal ecosystems has fueled a series of intertwined water quality processes that leads to low dissolved oxygen (DO) or hypoxia (DO ≤ 2 mg L-1) and reduced pH, which is also known as nutrient enhanced acidification. While the cumulative imp...

This is a requested presentation for the Association of Clean Water Administrators (ACWA) that discusses how ORD is the research arm of the EPA and provides the scientific foundation for EPA to execute its mandate to protect human health and the environment. An overview of the 6 ...

Wildfire activity in western US forests has increased over the last two decades, increasing solid and nutrient loadings to streams, and in some cases threatening drinking water supplies. Here, we demonstrate that a linked LANDIS-VELMA modeling approach can simulate wildland fire ...

Determination of the Effective Dispersion Coefficient in One-Dimensional Advection-Dispersion model using Random Walk Particle Tracking Approach Feng Shang and Jonathan Burkhart To accurately model the transport of water quality constituents within a pipe network, the one dimensi...

Improve concentration modeling within premise plumbing systems to understand fate and transport/ Also related to improved premise plumbing model.

Efforts to recover salmon populations in the Columbia River basin is a multi-million dollars per year enterprise, involving a wide array of stakeholders and managers, including Tribes, States, federal agencies, and utilities.  Successful and efficient restoration of fish hab...

Upgrade of the tool to work with EPANET2.2

EPANET-MSX enables the advanced water quality modeling of reactions that involve multiple reacting species. It will help researchers and practitioners better understand and analyze the water quality problems within drinking water distribution system. This manual documents the met...

New non-targeted analysis (NTA) technologies and supporting data analysis platforms have proven increasingly effective at identifying emerging contaminants in environmental and biological samples. Once contaminants are identified, effective mitigation strategies rely on the abili...

Non-targeted analysis (NTA) technologies and supporting data analysis platforms hold great potential for identifying thousands of chemicals in environmental and biological samples. However, challenges in linking identified chemical substances with upstream exogenous exposure sour...

Urban areas are built environments containing substantial amounts of impervious surfaces (e.g., streets, sidewalks, roof tops).  These areas often include elaborately engineered drainage networks designed to collect, transport, and discharge untreated stormwater into local s...

Municipal stormwater systems are designed to collect, transport, and discharge precipitation from a defined catchment area into local surface waters. However, these discharges may contain unsafe levels of fecal waste. Paired measurements of Escherichia coli, precipitation, three ...

Surface water quality models are critically important tools for managing our nation's surface waters. At the U.S. Environmental Protection Agency, quantitative models are used to help local communities and environmental managers better understand how surface waters change in resp...

Problem: Need a simpler, easy-to-use methodology to predict flow and constituents in surface waters that provides for model flexibility and intuitive user interaction   Objective: Develop a web-based platform to automate retrieval, processing, and synthesizing of data using ...

This presentation is an outreach to the National Tribal Toxics Council (NTTC). NTTC is an EPA Tribal Partnership group that is focused on providing Tribes with an opportunity for greater input on issues related to toxic chemicals and pollution prevention. This presentation w...

Many reactions that occur in water distribution systems cannot be completely described by the single species reactions available within EPANET, such as disinfectant byproduct (DBP) formation and associated disinfectant loss. To address this limitation, EPANET-MSX (Multi Species e...

This study illustrates the usage of multi-species modeling tool to analyze water quality and evaluate water safety within drinking water distribution system.

The delivery of safe, potable water to communities is the primary objective of drinking water utilities. However, the quality of the water can deteriorate as it is transported from the treatment plant through the distribution system to the customers due to interactions with the p...

This presentation is an overview of ORD's drinking water, stormwater, wastewater and water reuse models that are being used to design, improve, optimize and enhance the resilience of water systems.  This is being presented by Regan Murray, Caleb Buahin, Terra Haxton and Jeff...

Drinking water utilities are vulnerable to both human-caused and natural disasters that can impact the system infrastructure and the delivery of potable water to consumers. Resilience analysis can help utilities identify high-risk areas in their system and understand how to bette...

Although commercial polychlorinated biphenyl (PCB) production was banned in 1979 under the Toxics Substance Control Act (TSCA), inadvertent generation of PCBs (iPCBs) through a variety of chemical production processes continues to contaminate products and waste streams. The Spoka...

A random walk particle tracking approach was developed to analyze the advection and dispersion processes of the solute transport in a circular pipe. Stochastic difference equations were derived to model a solute particle’s two-dimensional random movement in the cross-sectio...

The use of Per- and polyfluoroalkyl substances (PFAS) in industrial applications predates analytical techniques for their identification in environmental matrices, leaving a gap in historical contamination records (Kissa et al., 2001). One way to determine past PFAS contamination...