Charlie Stillwell is a Hydrologist for the South Atlantic Water Science Center’s Watershed and Statistical Hydrology Team.
I study hydrology in altered watersheds, particularly those impacted by urbanization. How does development affect flow and water quality? Can green infrastructure counteract hydrologic alteration? I use statistical, data-driven methods to understand these patterns. My research supports water resource decision makers and I hope that my work promotes environmental justice whenever possible.
Professional Experience
Hydrologist, U.S. Geological Survey, South Atlantic Water Science Center, 2018-present
Education and Certifications
Ph.D. Biological & Agricultural Engineering, North Carolina State University, 2019
M.Eng. Biological & Agricultural Engineering, North Carolina State University, 2016
B.S. Civil Engineering, Drexel University, 2014
Science and Products
Urban Waters Federal Partnership: Walnut Creek, Raleigh, North Carolina
Water, Water Everywhere: Adapting Water Control Operations and Floodplain Conservation Planning to Global Change
Raleigh Bank Erosion Project
North Carolina Sustainable Rivers Program
Monitoring water-quality and geomorphology in the French Broad River during I-26 construction
Understanding the Effects of Stormwater Management Practices on Water Quality and Flow
Ft. Gordon, Georgia, Stormwater Assessment
Lidar-derived rasters of point density, elevation, and geomorphological features for 2013, 2015, and 2022 for the Greater Raleigh Area, North Carolina
Datasets for Rapid Assessment of Streambank Erosion Potential for Selected Streams throughout the Greater Raleigh Area, North Carolina, 2022
Data and Code for Predicting Flood Damage Probability Across the Conterminous United States
Application of the North Carolina Stochastic Empirical Loading and Dilution Model (SELDM) to Assess Potential Impacts of Highway Runoff
Development of the North Carolina stormwater-treatment decision-support system by using the Stochastic Empirical Loading and Dilution Model (SELDM)
Predicting inundation dynamics and hydroperiods of small, isolated wetlands using a machine learning approach
Closing the gap on wicked urban stream restoration problems: A framework to integrate science and community values
Lessons learned from 20 y of monitoring suburban development with distributed stormwater management in Clarksburg, Maryland, USA
Predicting flood damage probability across the conterminous United States
Evaluation of two existing flood management structures in U.S. Army Garrison Fort Gordon, Georgia, 2020
Science and Products
- Science
Urban Waters Federal Partnership: Walnut Creek, Raleigh, North Carolina
The U.S. Geological Survey (USGS) South Atlantic Water Science Center (SAWSC) geographic area has two Urban Waters Federal Partnership (UWFP) watersheds: Proctor Creek in Atlanta, GA, and Walnut Creek in Raleigh, NC. The local efforts in Walnut Creek are supported by many partner organizations, including but not limited to: Partners for Environmental Justice, the Carolina Wetlands Association, the...Water, Water Everywhere: Adapting Water Control Operations and Floodplain Conservation Planning to Global Change
Global change processes are producing shifts in temperature, precipitation, and seasonal streamflow regimes across North America. Much of the floodplain hydrology in the U.S. is managed through water control operations, often implemented on short time scales (e.g., weekly decisions), in response to short-term changes in precipitation. This operational model does not account for potential long-termRaleigh Bank Erosion Project
The City of Raleigh partnered with the U.S. Geological Survey (USGS) to assist in assessing streambank erosion hotspots along the City of Raleigh’s stream network to support the City’s efforts of prioritizing future stream mitigation projects. Streambank erosion potential will be assessed using remotely sensed light detection and ranging (lidar) data, field assessments of streambank conditions...North Carolina Sustainable Rivers Program
In 2002, The Nature Conservancy and the U.S. Army Corps of Engineers launched a collaborative effort to find more sustainable ways to manage river infrastructure to maximize benefits for people and nature. As of 2021, the Sustainable Rivers Program study area includes 40 rivers, 89 reservoirs, and 10,953 downstream river miles. The USGS South Atlantic Water Science Center and USGS Wetland and...Monitoring water-quality and geomorphology in the French Broad River during I-26 construction
The North Carolina Department of Transportation (NCDOT) has partnered with the U.S. Geological Survey (USGS) to assess the water-quality and geomorphologic impacts resulting from the I-26 construction projects in western North Carolina. Streamflow, precipitation, and water-quality monitoring data, coupled with periodic assessments of geomorphology, will support the NCDOT construction-site...Understanding the Effects of Stormwater Management Practices on Water Quality and Flow
Urban development can have detrimental impacts on streams including altering hydrology, increasing nutrient, sediment, and pollutant loadings, and degrading biological integrity. Stormwater Best Management Practices (BMPs) can be used to mitigate the effects of urban development by retaining large volumes of stormwater runoff and treating runoff to remove pollutants. This project focuses on...Ft. Gordon, Georgia, Stormwater Assessment
Fort Gordon is a U.S. Department of the Army facility located in east-central Georgia, approximately 10 miles west of Augusta, Georgia). The U.S. Geological Survey (USGS) South Atlantic Water Science Center is working cooperatively with the U.S. Department of the Army Environmental and Natural Resources Management Office of the U.S. Army Signal Center and Fort Gordon to assess the quality of... - Data
Lidar-derived rasters of point density, elevation, and geomorphological features for 2013, 2015, and 2022 for the Greater Raleigh Area, North Carolina
As part of a collaborative study with the City of Raleigh, North Carolina, the U.S. Geological Survey developed a suite of high-resolution lidar-derived raster datasets for the Greater Raleigh Area, North Carolina, using repeat lidar data from the years 2013, 2015, and 2022. These datasets include raster representations of digital elevation models (DEMs), DEM of difference, the ten most common geoDatasets for Rapid Assessment of Streambank Erosion Potential for Selected Streams throughout the Greater Raleigh Area, North Carolina, 2022
As part of a collaborative study with the City of Raleigh, North Carolina, the U.S. Geological Survey is assessing streambank erosion potential in selected stream reaches throughout the Greater Raleigh metropolitan area. Rapid field measurement techniques were used to assess streambank stability at 124 stream segments between January and March 2022. Field data were collected using the Bank ErosionData and Code for Predicting Flood Damage Probability Across the Conterminous United States
This data release contains the associated data described in the related primary publication, "Predicting Flood Damage Probability Across the Conterminous United States" (Collins et al. [2022], see Related External Resources section). Publicly available geospatial datasets and random forest algorithms were used to analyze the spatial distribution and underlying drivers of flood damage probability cApplication of the North Carolina Stochastic Empirical Loading and Dilution Model (SELDM) to Assess Potential Impacts of Highway Runoff
In 2013, the U.S. Geological Survey (USGS) in partnership with the U.S. Federal Highway Administration (FHWA) published a new national stormwater quality model called the Stochastic Empirical Loading Dilution Model (SELDM; Granato, 2013). The model is optimized for roadway projects but in theory can be applied to a broad range of development types. SELDM is a statistically-based empirical model pr - Publications
Development of the North Carolina stormwater-treatment decision-support system by using the Stochastic Empirical Loading and Dilution Model (SELDM)
The Federal Highway Administration and State departments of transportation nationwide need an efficient method to assess potential adverse effects of highway stormwater runoff on receiving waters to optimize stormwater-treatment decisions. To this end, the U.S. Geological Survey, in cooperation with the Federal Highway Administration and the North Carolina Department of Transportation (NCDOT), devAuthorsGregory E. Granato, Charles C. Stillwell, J. Curtis Weaver, Andrew H. McDaniel, Brian S. Lipscomb, Susan C. Jones, Ryan M. MullinsPredicting inundation dynamics and hydroperiods of small, isolated wetlands using a machine learning approach
The duration of inundation or saturation (i.e., hydroperiod) controls many wetland functions. In particular, it is a key determinant of whether a wetland will provide suitable breeding habitat for amphibians and other taxa that often have specific hydrologic requirements. Yet, scientists and land managers often are challenged by a lack of sufficient monitoring data to enable the understanding of tAuthorsJeffrey W. Riley, Charles C. StillwellClosing the gap on wicked urban stream restoration problems: A framework to integrate science and community values
Restoring the health of urban streams has many of the characteristics of a wicked problem. Addressing a wicked problem requires managers, academics, practitioners, and community members to make negotiated tradeoffs and compromises to satisfy the values and perspectives of diverse stakeholders involved in setting restoration project goals and objectives. We conducted a gap analysis on 11 urban streAuthorsBrian M. Murphy, Kathryn L Russell, Charles C. Stillwell, Robert J. Hawley, Mateo Scoggins, Kristina G. Hopkins, Matthew J. Burns, Kristine T. Taniguchi-Quan, Kate H Macneale, Robert F. SmithLessons learned from 20 y of monitoring suburban development with distributed stormwater management in Clarksburg, Maryland, USA
Urban development is a well-known stressor for stream ecosystems, presenting a challenge to managers tasked with mitigating its effects. For the past 20 y, streamflow, water quality, geomorphology, and benthic communities were monitored in 5 watersheds in Montgomery County, Maryland, USA. This study presents a synthesis of multiple studies of monitoring efforts in the study area and new analysis oAuthorsKristina G. Hopkins, Sean Woznicki, Brianna Williams, Charles C. Stillwell, Eric Naibert, Marina Metes, Daniel Jones, Dianna M. Hogan, Natalie Celeste Hall, Rosemary M. Fanelli, Aditi S. BhaskarPredicting flood damage probability across the conterminous United States
Floods are the leading cause of natural disaster damages in the United States, with billions of dollars incurred every year in the form of government payouts, property damages, and agricultural losses. The Federal Emergency Management Agency oversees the delineation of floodplains to mitigate damages, but disparities exist between locations designated as high risk and where flood damages occur dueAuthorsElyssa Collins, Georgina M. Sanchez, Adam Terando, Charles C. Stillwell, Helena Mitasova, Antonia Sebastian, Ross K. MeentemeyerEvaluation of two existing flood management structures in U.S. Army Garrison Fort Gordon, Georgia, 2020
Two existing flood management structures in U.S. Army Garrison Fort Gordon, Georgia, were evaluated for potential retrofitting to address water-quality impacts, pursuant of U.S. Army Garrison Fort Gordon’s storm water management program. Stormwater calculations were computed according to the Georgia Stormwater Management Manual, including drainage area delineations, design-storm runoff volumes andAuthorsCharles C. Stillwell