The U.S. Geological Survey’s StreamStats program is a publicly-accessible web application (https://streamstats.usgs.gov) that can be used to delineate drainage areas, compute basin characteristics, and estimate flow statistics for user-selected locations on streams. StreamStats services are typically implemented at the statewide or watershed scale (referred to as state or basin applications), and although the three core functionalities remain consistent, many states have implemented custom tools to address specific water-resources planning and management needs. In Massachusetts, a watershed-scale application for the Mystic River Basin was developed to support stakeholder efforts to address stormwater challenges in this highly urbanized basin. The Mystic River Basin stormwater functionality was developed by incorporating 1-meter resolution lidar-derived elevation data and municipal storm drain data to accurately represent urban topography and stormwater flow (that is, subsurface piped flow). In the Mystic River Basin application, users can view the network of stormwater pipes and inlets, delineate drainage areas derived from lidar topography and stormwater infrastructure, and compute land-use/land-cover (LULC) basin characteristics. This data release contains the LULC data available in the Mystic River Basin StreamStats application as a Georeferenced Tagged Image File Format (GeoTIFF) raster dataset. This dataset was developed by processing Massachusetts 2016 LULC data (MassGIS, 2019) and Soil Survey Geographic data (SSURGO; NRCS, 2020) according to Massachusetts Department of Environmental Protection guidelines to produce categories consistent with the 2016 Massachusetts Small Municipal Separate Storm Sewer System (MS4) General Permit Pollutant Loading Export Rates for aggregated land uses (Schifman, 2022). References: MassGIS, 2019, 2016 Land Cover/Land Use: MassGIS Bureau of Geographic Information, accessed April 11, 2022, at https://www.mass.gov/info-details/massgis-data-2016-land-coverland-use. Natural Resources Conservation Service [NRCS], 2020, Soils Polygons for Massachusetts with "Top 20" Fields: MassGIS Bureau of Geographic Information, accessed December 1, 2021, at https://www.mass.gov/info-details/massgis-data-soils-ssurgo-certified-nrcs. Schifman, L.A, 2022, 2016 Massachusetts Small MS4 Permit Pollutant Loading Export Rates applied to the 2016 Massachusetts Land Use/Land Cover GIS Dataset: Massachusetts Department of Environmental Protection, 7 p., accessed May 23, 2022, at https://www.mass.gov/doc/2016-massachusetts-small-ms4-permit-pollutant-loading-export-rates.

The U.S. Geological Survey’s StreamStats program is a publicly-accessible web application (https://streamstats.usgs.gov) that can be used to delineate drainage areas, compute basin characteristics, and estimate flow statistics for user-selected locations on streams. StreamStats services are typically implemented at the statewide or watershed scale (referred to as state or basin applications), and although the three core functionalities remain consistent, many states have implemented custom tools to address specific water-resources planning and management needs. In Massachusetts, a watershed-scale application for the Mystic River Basin was developed to support stakeholder efforts to address stormwater challenges in this highly urbanized basin. The Mystic River Basin stormwater functionality was developed by incorporating 1-meter resolution lidar-derived elevation data and municipal storm drain data to accurately represent urban topography and stormwater flow (that is, subsurface piped flow). In the Mystic River Basin application, users can view the network of stormwater pipes and inlets, delineate drainage areas derived from lidar topography and stormwater infrastructure, and compute land-use/land-cover basin characteristics. This data release contains the 1-meter resolution digital elevation model (DEM; dem.tif) and two datasets derived from the DEM that support on-the-fly watershed delineation in the StreamStats web application. The flow direction raster (fdr.tif) is a raster dataset that indicates the direction of flow out of each cell; if the cell contains a stormwater inlet, it is represented as a sink in the flow direction raster. The catchment raster (cat.tif) represents the drainage areas to stormwater inlets and to surface-water flowpaths within the basin. The flow direction and catchment rasters are used in conjunction with the stormwater network to determine the drainage area to a point of interest selected by the user in StreamStats. This point must lie on the stormwater network, at either an inlet, on a pipe, or on a surface-water flowpath. The delineation produced in StreamStats is the accumulation of all catchments draining to the point of interest. To describe the processing steps used to produce the DEM, fdr, and cat rasters published in this data release, the overall approach to developing the Mystic River Basin stormwater functionality is given in the associated metadata. Please note that the stormwater network, comprised of stormwater inlets, pipes, culverts, and surface flow, produced for this study is not available for publication due to sensitivity concerns. Inquiries about these data may be made to the point of contact provided in the metadata.

The U.S. Geological Survey’s StreamStats program is a publicly-accessible web application (https://streamstats.usgs.gov) that can be used to delineate drainage areas, compute basin characteristics, and estimate flow statistics for user-selected locations on streams. StreamStats services are typically implemented at the statewide or watershed scale (referred to as state or basin applications), and although the three core functionalities remain consistent, many states have implemented custom tools to address specific water-resources planning and management needs. In Massachusetts, a watershed-scale application for the Mystic River Basin was developed to support stakeholder efforts to address stormwater challenges in this highly urbanized basin. The Mystic River Basin stormwater functionality was developed by incorporating 1-meter resolution lidar-derived elevation data and municipal storm drain data to accurately represent urban topography and stormwater flow (that is, subsurface piped flow). In the Mystic River Basin application, users can view the network of stormwater pipes and inlets, delineate drainage areas derived from lidar topography and stormwater infrastructure, and compute land-use/land-cover basin characteristics. This data release contains the 1-meter resolution digital elevation model (DEM; dem.tif) and two datasets derived from the DEM that support on-the-fly watershed delineation in the StreamStats web application. The flow direction raster (fdr.tif) is a raster dataset that indicates the direction of flow out of each cell; if the cell contains a stormwater inlet, it is represented as a sink in the flow direction raster. The catchment raster (cat.tif) represents the drainage areas to stormwater inlets and to surface-water flowpaths within the basin. The flow direction and catchment rasters are used in conjunction with the stormwater network to determine the drainage area to a point of interest selected by the user in StreamStats. This point must lie on the stormwater network, at either an inlet, on a pipe, or on a surface-water flowpath. The delineation produced in StreamStats is the accumulation of all catchments draining to the point of interest. To describe the processing steps used to produce the DEM, fdr, and cat rasters published in this data release, the overall approach to developing the Mystic River Basin stormwater functionality is given in the associated metadata. Please note that the stormwater network, comprised of stormwater inlets, pipes, culverts, and surface flow, produced for this study is not available for publication due to sensitivity concerns. Inquiries about these data may be made to the point of contact provided in the metadata.

This data was created to support the Washington D.C. StreamStats project funded by the Washington D.C. Department of Energy and Environment (DOEE). This dataset contains basin characteristics for 154 urban streamflow gaging stations (streamgages) operated by the U.S. Geological Survey (USGS) in Delaware, District of Columbia, Maryland, New Jersey, Pennsylvania, and Virginia. Characteristics include mean slope (percent rise) using 3-meter and 10-foot resolution digital elevation models (DEM) and impervious cover derived from 1-meter resolution land cover datasets. Included in the dataset are a CSV file with basin characteristics for each streamgage station and a shapefile with watershed boundaries for each station.

This child page contains the drainage basin characteristics that were computed for each drainage basin and considered to be potential explanatory variables in multiple regression analysis in the 2025 VA-WV flood-frequency analysis. The six tables are grouped by source datasets and include: 1) Table_9_L3_Ecoregions.txt: Contains area and percent of Level III ecoregions from the Environmental Protection Agency within each basin 2) Table_10_L4_Ecoregions.txt:Contains area and percent of Level IV ecoregions from the Environmental Protection Agency within each basin 3) Table_11_Land_Cover_2019.txt: Contains area and percent of land cover classes from the 2019 National Land Cover Dataset within each basin 4) Table_12_Miscellaneous.txt: Contains miscellaneous information about selected geographic, geometric, and geologic properties of each basin 5) Table_13_Physiography.txt: Contains area and percent of physiographic provinces from Fenneman and Johnson, 1946 within each basin 6) Table_14_Precipitation.txt: Contains the mean annual precipitation from PRISM and the mean precipitation at selected recurrence intervals from NOAA Atlas 14 for each basin 7) Table_15_BC_Evaluation.txt: A subset of 121 of these basin characteristics were evaluated using correlation and scatterplot matrices and results are summarized 8) Table_17_Drainage_Basin_Areas_within_Regions.txt: Contains the total area and percentage of area of each hydrologic regression region within each streamgage drainage basin The associated child page titled "Drainage basin polygons and outlet points for 1050 selected streamgages in and near Virginia and West Virginia, 2025" contains geospatial layers of drainage outlet points and drainage basin boundaries that were generated in this study. These shapefiles can be merged with the basin characteristics files using the Station_ID field.

This dataset provides numerical and categorical descriptions of 48 basin characteristics for 956 basins with observed streamflow information at U.S. Geological Survey (USGS) streamflow-gaging stations. Characteristics are indexed by National Hydrography Dataset (NHD) version 2 COMID (integer that uniquely identifies each feature in the NHD) and USGS station number for streamflow-gaging station. The variables represent mutable and immutable basin characteristics and are organized by characteristic type: physical (5), hydrologic (6), categorical (12), climate (6), landscape alteration (7), and land cover (12). Mutable characteristics such as climate, land cover, and landscape alteration variables are reported in decadal increments (for example, average percent forest for the decade 1950-1959, 1960-1969, etc). The majority of basin characteristics in this dataset were calculated using divergence-routing methods and are often referred to as “network-accumulated”. This method uses a modified routing database to navigate the NHDPlus reach network to aggregate (accumulate) the values derived from the reach catchment scale (Schwarz, G.E., and Wieczorek, M.E., 2018, Database of modified routing for NHDPlus version 2.1 flowlines: ENHDPlusV2_us: U.S. Geological Survey data release, https://doi.org/10.5066/P9PA63SM ). In four instances, values are also provided for the entire catchment above a site and area designated using the “CAT_” prefix.

This dataset provides numerical and categorical descriptions of 48 basin characteristics for 9,314 ungaged basins coinciding with 12-digit hydrologic unit code (HUC12) pour points that drain to the Gulf of Mexico. Characteristics are indexed by National Hydrography Dataset (NHD) version 2 COMID (integer that uniquely identifies each feature in the NHD) and HUC12 identifying number. The variables represent mutable and immutable basin characteristics and are organized by characteristic type: physical (5), hydrologic (6), categorical (12), climate (6), landscape alteration (7), and land cover (12). Mutable characteristics such as climate, land cover, and landscape alteration variables are reported in decadal increments (for example, average percent forest for the decade 1950-1959, 1960-1969, etc). The majority of basin characteristics in this dataset were calculated using divergence-routing methods and are often referred to as “network-accumulated”. This method uses a modified routing database to navigate the NHDPlus reach network to aggregate (accumulate) the values derived from the reach catchment scale (Schwarz, G.E., and Wieczorek, M.E., 2018, Database of modified routing for NHDPlus version 2.1 flowlines: ENHDPlusV2_us: U.S. Geological Survey data release, https://doi.org/10.5066/P9PA63SM ). In four instances, values are also provided for the entire catchment above a site and area designated using the “CAT_” prefix.

This dataset provides numerical and categorical descriptions of 48 basin characteristics for 9,314 ungaged basins coinciding with 12-digit hydrologic unit code (HUC12) pour points that drain to the Gulf of Mexico. Characteristics are indexed by National Hydrography Dataset (NHD) version 2 COMID (integer that uniquely identifies each feature in the NHD) and HUC12 identifying number. The variables represent mutable and immutable basin characteristics and are organized by characteristic type: physical (5), hydrologic (6), categorical (12), climate (6), landscape alteration (7), and land cover (12). Mutable characteristics such as climate, land cover, and landscape alteration variables are reported in decadal increments (for example, average percent forest for the decade 1950-1959, 1960-1969, etc). The majority of basin characteristics in this dataset were calculated using divergence-routing methods and are often referred to as “network-accumulated”. This method uses a modified routing database to navigate the NHDPlus reach network to aggregate (accumulate) the values derived from the reach catchment scale (Schwarz, G.E., and Wieczorek, M.E., 2018, Database of modified routing for NHDPlus version 2.1 flowlines: ENHDPlusV2_us: U.S. Geological Survey data release, https://doi.org/10.5066/P9PA63SM ). In four instances, values are also provided for the entire catchment above a site and area designated using the “CAT_” prefix.

This dataset represents the density of 18 USGS lithology classes within individual, local NHDPlusV2 catchments and upstream, contributing watersheds(see Data Sources for links to NHDPlusV2 data and USGS). Attributes were calculated for every local NHDPlusV2 catchment and then accumulated to provide watershed-level metrics for USGS lithology data. This data set is derived from the USGS raster map of 18 lithology classes (categorical data type) for the conterminous USA. The map was produced based on texture, internal structure, thickness, and environment of deposition or formation of materials. These 18 lithology classes were summarized by local catchment and by watershed to produce 18 local catchment-level and watershed-level metrics as a categorical data type.

This dataset represents percent area consisting of carbonate-rock aquifers, igneous and metamorphic-rock, sandstone, sandstone and carbonate-rock, semiconsolidated sand, and unconsolidated sand and gravel aquifers within individual, local NHDPlusV2 catchments and upstream, contributing watersheds.