Alan H Rea, P.E. (Retired) (Former Employee)
Science and Products
Filter Total Items: 34
Precision of headwater stream permanence estimates from a monthly water balance model in the Pacific Northwest, USA Precision of headwater stream permanence estimates from a monthly water balance model in the Pacific Northwest, USA
Stream permanence classifications (i.e., perennial, intermittent, ephemeral) are a primary consideration to determine stream regulatory status in the United States (U.S.) and are an important indicator of environmental conditions and biodiversity. However, at present, no models or products adequately describe surface water presence for regulatory determinations. We modified the...
Authors
Konrad Hafen, Kyle W. Blasch, Paul E. Gessler, Roy Sando, Alan H. Rea
The influence of climate variability on the accuracy of NHD perennial and non-perennial stream classifications The influence of climate variability on the accuracy of NHD perennial and non-perennial stream classifications
National Hydrography Dataset (NHD) stream permanence classifications (SPC; perennial, intermittent, and ephemeral) are widely used for data visualization and applied science, and have implications for resource policy and management. NHD SPC were assigned using a combination of topographic field surveys and interviews with local residents. However, previous studies indicate that non‐NHD...
Authors
Konrad Hafen, Kyle W. Blasch, Alan H. Rea, Roy Sando, Paul Gessler
User's guide for the national hydrography dataset plus (NHDPlus) high resolution User's guide for the national hydrography dataset plus (NHDPlus) high resolution
The National Hydrography Dataset Plus High Resolution (NHDPlus HR) is a scalable geospatial hydrography framework built from the High Resolution (1:24,000-scale or better) National Hydrography Dataset (NHD), nationally complete Watershed Boundary Dataset (WBD), and ⅓-arc-second (10-meter ground spacing) 3D Elevation Program (3DEP) digital elevation model (DEM) data. The NHDPlus HR brings...
Authors
Richard B. Moore, Lucinda D. McKay, Alan H. Rea, Timothy R. Bondelid, Curtis V. Price, Thomas G. Dewald, Craig M. Johnston
An integrated framework for ecological drought across riverscapes of North America An integrated framework for ecological drought across riverscapes of North America
Climate change is increasing the severity and extent of extreme droughts events, posing a critical threat to freshwater ecosystems, particularly with increasing human demands for diminishing water supplies. Despite the importance of drought as a significant driver of ecological and evolutionary dynamics, current understanding of drought consequences for freshwater biodiversity is very...
Authors
Ryan Kovach, Jason B. Dunham, Robert Al-Chokhachy, Craig Snyder, Erik A. Beever, Gregory T. Pederson, Abigail Lynch, Nathaniel P. Hitt, Christopher P. Konrad, Kristin L. Jaeger, Alan H. Rea, Adam J. Sepulveda, Patrick M. Lambert, Jason M. Stoker, J. Joseph Giersch, Clint C. Muhlfeld
NHDPlusHR: A national geospatial framework for surface-water information NHDPlusHR: A national geospatial framework for surface-water information
The U.S. Geological Survey is developing a new geospatial hydrographic framework for the United States, called the National Hydrography Dataset Plus High Resolution (NHDPlusHR), that integrates a diversity of the best-available information, robustly supports ongoing dataset improvements, enables hydrographic generalization to derive alternate representations of the network while...
Authors
Roland J. Viger, Alan H. Rea, Jeffrey D. Simley, Karen M. Hanson
The Open Water Data Initiative: Water information for a thirsty nation The Open Water Data Initiative: Water information for a thirsty nation
Initial efforts of the Open Water Data Initiative have focused on three use cases covering flooding, drought, and contaminant spill response, with a goal of identifying critical water data resources and making them more accessible. Significant progress has been made in the past year, although much remains to be done.
Authors
Alan Rea, Edward Clark, Angela Adams, William B. Samuels
Geospatial datasets for watershed delineation and characterization used in the Hawaii StreamStats web application Geospatial datasets for watershed delineation and characterization used in the Hawaii StreamStats web application
The U.S. Geological Survey Hawaii StreamStats application uses an integrated suite of raster and vector geospatial datasets to delineate and characterize watersheds. The geospatial datasets used to delineate and characterize watersheds on the StreamStats website, and the methods used to develop the datasets are described in this report. The datasets for Hawaii were derived primarily from...
Authors
Alan Rea, Kenneth D. Skinner
Estimating Locations of Perennial Streams in Idaho Using a Generalized Least-Squares Regression Model of 7-Day, 2-Year Low Flows Estimating Locations of Perennial Streams in Idaho Using a Generalized Least-Squares Regression Model of 7-Day, 2-Year Low Flows
Many State and Federal agencies use information regarding the locations of streams having intermittent or perennial flow when making management and regulatory decisions. For example, the application of some Idaho water quality standards depends on whether streams are intermittent. Idaho Administrative Code defines an intermittent stream as one having a 7-day, 2-year low flow (7Q2) less...
Authors
Molly S. Wood, Alan Rea, Kenneth D. Skinner, Jon Hortness
Estimated Perennial Streams of Idaho and Related Geospatial Datasets Estimated Perennial Streams of Idaho and Related Geospatial Datasets
The perennial or intermittent status of a stream has bearing on many regulatory requirements. Because of changing technologies over time, cartographic representation of perennial/intermittent status of streams on U.S. Geological Survey (USGS) topographic maps is not always accurate and (or) consistent from one map sheet to another. Idaho Administrative Code defines an intermittent stream...
Authors
Alan Rea, Kenneth D. Skinner
Evaluation of catchment delineation methods for the medium-resolution National Hydrography Dataset Evaluation of catchment delineation methods for the medium-resolution National Hydrography Dataset
Different methods for determining catchments (incremental drainage areas) for stream segments of the medium-resolution (1:100,000-scale) National Hydrography Dataset (NHD) were evaluated by the U.S. Geological Survey (USGS), in cooperation with the U.S. Environmental Protection Agency (USEPA). The NHD is a comprehensive set of digital spatial data that contains information about surface...
Authors
Craig M. Johnston, Thomas G. Dewald, Timothy R. Bondelid, Bruce B. Worstell, Lucinda D. McKay, Alan Rea, Richard B. Moore, Jonathan L. Goodall
StreamStats: A water resources web application StreamStats: A water resources web application
Streamflow statistics, such as the 1-percent flood, the mean flow, and the 7-day 10-year low flow, are used by engineers, land managers, biologists, and many others to help guide decisions in their everyday work. For example, estimates of the 1-percent flood (the flow that is exceeded, on average, once in 100 years and has a 1-percent chance of being exceeded in any year, sometimes...
Authors
Kernell G. Ries, John D. Guthrie, Alan H. Rea, Peter A. Steeves, David W. Stewart
National Stream Summarization: Standardizing Stream-Landscape Summaries
As research and management of natural resources shift from local to regional and national scales, the need for information about aquatic systems to be summarized to multiple scales is becoming more apparent. Recently, four federally funded national stream assessment efforts (USGS Aquatic GAP, USGS National Water-Quality Assessment Program, U.S. Environmental Protection Agency [EPA]...
Flow-Conditioned Parameter Grids for the Contiguous United States: A Pilot, Seamless Basin Characteristic Dataset Flow-Conditioned Parameter Grids for the Contiguous United States: A Pilot, Seamless Basin Characteristic Dataset
Abstract To aid in parameterization of mechanistic, statistical, and machine learning models of hydrologic systems in the contiguous United States (CONUS), flow-conditioned parameter grids (FCPGs) have been generated describing upstream basin mean elevation, slope, land cover class, latitude, and 30-year climatologies of mean total annual precipitation, minimum daily air temperature, and...
Flow-Conditioned Parameter Grid Tools Flow-Conditioned Parameter Grid Tools
The Flow-Conditioned Parameter Grid (FCPG) Tools are a Python 3 library to make FCPGs for either two-digit Hydrologic Unit Code (HUC2) regions, four-digit Hydrologic Unit Code (HUC4) regions, or other geospatial tiling schemes. These tools can be used in a Linux-based high performance computing (HPC) environment or locally on your system.
StreamStats Data Preparation Tools, version 4 StreamStats Data Preparation Tools, version 4
A Python package to pre-process and hydro-enforce digital elevation models using hydrography features for use in the U.S. Geological Survey (USGS) StreamStats project.
Science and Products
Filter Total Items: 34
Precision of headwater stream permanence estimates from a monthly water balance model in the Pacific Northwest, USA Precision of headwater stream permanence estimates from a monthly water balance model in the Pacific Northwest, USA
Stream permanence classifications (i.e., perennial, intermittent, ephemeral) are a primary consideration to determine stream regulatory status in the United States (U.S.) and are an important indicator of environmental conditions and biodiversity. However, at present, no models or products adequately describe surface water presence for regulatory determinations. We modified the...
Authors
Konrad Hafen, Kyle W. Blasch, Paul E. Gessler, Roy Sando, Alan H. Rea
The influence of climate variability on the accuracy of NHD perennial and non-perennial stream classifications The influence of climate variability on the accuracy of NHD perennial and non-perennial stream classifications
National Hydrography Dataset (NHD) stream permanence classifications (SPC; perennial, intermittent, and ephemeral) are widely used for data visualization and applied science, and have implications for resource policy and management. NHD SPC were assigned using a combination of topographic field surveys and interviews with local residents. However, previous studies indicate that non‐NHD...
Authors
Konrad Hafen, Kyle W. Blasch, Alan H. Rea, Roy Sando, Paul Gessler
User's guide for the national hydrography dataset plus (NHDPlus) high resolution User's guide for the national hydrography dataset plus (NHDPlus) high resolution
The National Hydrography Dataset Plus High Resolution (NHDPlus HR) is a scalable geospatial hydrography framework built from the High Resolution (1:24,000-scale or better) National Hydrography Dataset (NHD), nationally complete Watershed Boundary Dataset (WBD), and ⅓-arc-second (10-meter ground spacing) 3D Elevation Program (3DEP) digital elevation model (DEM) data. The NHDPlus HR brings...
Authors
Richard B. Moore, Lucinda D. McKay, Alan H. Rea, Timothy R. Bondelid, Curtis V. Price, Thomas G. Dewald, Craig M. Johnston
An integrated framework for ecological drought across riverscapes of North America An integrated framework for ecological drought across riverscapes of North America
Climate change is increasing the severity and extent of extreme droughts events, posing a critical threat to freshwater ecosystems, particularly with increasing human demands for diminishing water supplies. Despite the importance of drought as a significant driver of ecological and evolutionary dynamics, current understanding of drought consequences for freshwater biodiversity is very...
Authors
Ryan Kovach, Jason B. Dunham, Robert Al-Chokhachy, Craig Snyder, Erik A. Beever, Gregory T. Pederson, Abigail Lynch, Nathaniel P. Hitt, Christopher P. Konrad, Kristin L. Jaeger, Alan H. Rea, Adam J. Sepulveda, Patrick M. Lambert, Jason M. Stoker, J. Joseph Giersch, Clint C. Muhlfeld
NHDPlusHR: A national geospatial framework for surface-water information NHDPlusHR: A national geospatial framework for surface-water information
The U.S. Geological Survey is developing a new geospatial hydrographic framework for the United States, called the National Hydrography Dataset Plus High Resolution (NHDPlusHR), that integrates a diversity of the best-available information, robustly supports ongoing dataset improvements, enables hydrographic generalization to derive alternate representations of the network while...
Authors
Roland J. Viger, Alan H. Rea, Jeffrey D. Simley, Karen M. Hanson
The Open Water Data Initiative: Water information for a thirsty nation The Open Water Data Initiative: Water information for a thirsty nation
Initial efforts of the Open Water Data Initiative have focused on three use cases covering flooding, drought, and contaminant spill response, with a goal of identifying critical water data resources and making them more accessible. Significant progress has been made in the past year, although much remains to be done.
Authors
Alan Rea, Edward Clark, Angela Adams, William B. Samuels
Geospatial datasets for watershed delineation and characterization used in the Hawaii StreamStats web application Geospatial datasets for watershed delineation and characterization used in the Hawaii StreamStats web application
The U.S. Geological Survey Hawaii StreamStats application uses an integrated suite of raster and vector geospatial datasets to delineate and characterize watersheds. The geospatial datasets used to delineate and characterize watersheds on the StreamStats website, and the methods used to develop the datasets are described in this report. The datasets for Hawaii were derived primarily from...
Authors
Alan Rea, Kenneth D. Skinner
Estimating Locations of Perennial Streams in Idaho Using a Generalized Least-Squares Regression Model of 7-Day, 2-Year Low Flows Estimating Locations of Perennial Streams in Idaho Using a Generalized Least-Squares Regression Model of 7-Day, 2-Year Low Flows
Many State and Federal agencies use information regarding the locations of streams having intermittent or perennial flow when making management and regulatory decisions. For example, the application of some Idaho water quality standards depends on whether streams are intermittent. Idaho Administrative Code defines an intermittent stream as one having a 7-day, 2-year low flow (7Q2) less...
Authors
Molly S. Wood, Alan Rea, Kenneth D. Skinner, Jon Hortness
Estimated Perennial Streams of Idaho and Related Geospatial Datasets Estimated Perennial Streams of Idaho and Related Geospatial Datasets
The perennial or intermittent status of a stream has bearing on many regulatory requirements. Because of changing technologies over time, cartographic representation of perennial/intermittent status of streams on U.S. Geological Survey (USGS) topographic maps is not always accurate and (or) consistent from one map sheet to another. Idaho Administrative Code defines an intermittent stream...
Authors
Alan Rea, Kenneth D. Skinner
Evaluation of catchment delineation methods for the medium-resolution National Hydrography Dataset Evaluation of catchment delineation methods for the medium-resolution National Hydrography Dataset
Different methods for determining catchments (incremental drainage areas) for stream segments of the medium-resolution (1:100,000-scale) National Hydrography Dataset (NHD) were evaluated by the U.S. Geological Survey (USGS), in cooperation with the U.S. Environmental Protection Agency (USEPA). The NHD is a comprehensive set of digital spatial data that contains information about surface...
Authors
Craig M. Johnston, Thomas G. Dewald, Timothy R. Bondelid, Bruce B. Worstell, Lucinda D. McKay, Alan Rea, Richard B. Moore, Jonathan L. Goodall
StreamStats: A water resources web application StreamStats: A water resources web application
Streamflow statistics, such as the 1-percent flood, the mean flow, and the 7-day 10-year low flow, are used by engineers, land managers, biologists, and many others to help guide decisions in their everyday work. For example, estimates of the 1-percent flood (the flow that is exceeded, on average, once in 100 years and has a 1-percent chance of being exceeded in any year, sometimes...
Authors
Kernell G. Ries, John D. Guthrie, Alan H. Rea, Peter A. Steeves, David W. Stewart
National Stream Summarization: Standardizing Stream-Landscape Summaries
As research and management of natural resources shift from local to regional and national scales, the need for information about aquatic systems to be summarized to multiple scales is becoming more apparent. Recently, four federally funded national stream assessment efforts (USGS Aquatic GAP, USGS National Water-Quality Assessment Program, U.S. Environmental Protection Agency [EPA]...
Flow-Conditioned Parameter Grids for the Contiguous United States: A Pilot, Seamless Basin Characteristic Dataset Flow-Conditioned Parameter Grids for the Contiguous United States: A Pilot, Seamless Basin Characteristic Dataset
Abstract To aid in parameterization of mechanistic, statistical, and machine learning models of hydrologic systems in the contiguous United States (CONUS), flow-conditioned parameter grids (FCPGs) have been generated describing upstream basin mean elevation, slope, land cover class, latitude, and 30-year climatologies of mean total annual precipitation, minimum daily air temperature, and...
Flow-Conditioned Parameter Grid Tools Flow-Conditioned Parameter Grid Tools
The Flow-Conditioned Parameter Grid (FCPG) Tools are a Python 3 library to make FCPGs for either two-digit Hydrologic Unit Code (HUC2) regions, four-digit Hydrologic Unit Code (HUC4) regions, or other geospatial tiling schemes. These tools can be used in a Linux-based high performance computing (HPC) environment or locally on your system.
StreamStats Data Preparation Tools, version 4 StreamStats Data Preparation Tools, version 4
A Python package to pre-process and hydro-enforce digital elevation models using hydrography features for use in the U.S. Geological Survey (USGS) StreamStats project.