Predictions from statistical modeling of floodplains, streambanks, and streambeds in the Chesapeake Bay and Delaware River watersheds of the U.S. Mid-Atlantic. Random Forest statistical models using either 1) characteristics of upstream drainage area, or 2) characteristics of upstream drainage area (Wieczorek et al. 2018, https://doi.org/10.5066/f7765d7v) and reach geomorphometry (Hopkins et al. 2020, https://doi.org/10.5066/P9RQJPT1), were used to explain and predict spatial variation in measured floodplain and streambank flux of sediment, fine sediment, sediment-C, sediment-N, and sediment-P and rates of geomorphic change, and streambed sediment characteristics (d50, cover by fine sediment, cover by fine and sand sediment) (Noe et al. 2020, https://doi.org/10.5066/P9QLJYPX). These predictions were compared to published estimates of upland erosion and delivery of upland erosion to streams (Chesapeake Bay Program, https://cast.chesapeakebay.net/Documentation/ModelDocumentation), and catchment export (Ator 2019, https://doi.org/10.3133/sir20195118).

Dataset includes site averages of measurements of floodplain and streambank sediment physico-chemistry and long-term (dendrogeomorphic) vertical and lateral geomorphic change, and reach scale floodplain width, streambank height, channel width, and streambed particle size. This information was used to calculate fluxes of sediment, fine sediment, sediment-C, sediment-N, and sediment-P of floodplains and of streambanks at each site. Sixty-eight sites were sampled in the USGS Chesapeake and Delaware Floodplain Network. Sites were chosen to have largely unmodified geomorphology, permission to access, and presence of woody vegetation to enable the dendrogeomorphic technique.

Dataset includes site averages of measurements of floodplain and streambank sediment physico-chemistry and long-term (dendrogeomorphic) vertical and lateral geomorphic change, and reach scale floodplain width, streambank height, channel width, and streambed particle size. This information was used to calculate fluxes of sediment, fine sediment, sediment-C, sediment-N, and sediment-P of floodplains and of streambanks at each site. Sixty-eight sites were sampled in the USGS Chesapeake and Delaware Floodplain Network. Sites were chosen to have largely unmodified geomorphology, permission to access, and presence of woody vegetation to enable the dendrogeomorphic technique.

Input data on watershed drainage area characteristics and stream reach geomorphometry for statistical modeling of floodplains, streambanks, and streambeds in the Chesapeake Bay and Delaware River watersheds of the U.S. Mid-Atlantic. Characteristics include selected upstream accumulated attributes (with divergence routing) describing geology, topography, soils, hydrology, and land use for each NHDPlusV2 stream reach from Wieczorek et al. (2018), and the geomorphometry of the local stream reach summarized from Hopkins et al. (2020). These potential predictors were tested for incorporation into Random Forest statistical models to explain and predict spatial variation in floodplain and streambank flux of sediment, fine sediment, sediment-C, sediment-N, and sediment-P and rates of geomorphic change, and streambed sediment characteristics (d50, cover by fine sediment, cover by fine and sand sediment).

Input data on watershed drainage area characteristics and stream reach geomorphometry for statistical modeling of floodplains, streambanks, and streambeds in the Chesapeake Bay and Delaware River watersheds of the U.S. Mid-Atlantic. Characteristics include selected upstream accumulated attributes (with divergence routing) describing geology, topography, soils, hydrology, and land use for each NHDPlusV2 stream reach from Wieczorek et al. (2018), and the geomorphometry of the local stream reach summarized from Hopkins et al. (2020). These potential predictors were tested for incorporation into Random Forest statistical models to explain and predict spatial variation in floodplain and streambank flux of sediment, fine sediment, sediment-C, sediment-N, and sediment-P and rates of geomorphic change, and streambed sediment characteristics (d50, cover by fine sediment, cover by fine and sand sediment).

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 metadata describes source data and processing steps for creating a geospatial dataset containing the hydrologic regions used in the 2025 Virginia and West Virginia flood-frequency analysis (Messinger and Other, 2025). These twelve regions are the results of an exploratory analysis process described in more detail within the manuscript. Regression regions for the study area are provided in shapefile format in "Regression_Regions.shp"; shapefile components are compressed within a folder named "Regression_Regions.zip"

Geomorphometry for Streams and Floodplains in the Chesapeake and Delaware Watersheds was generated as part of the project Quantifying Floodplain Ecological Processes and Ecosystem Services in the Delaware River Watershed funded through the William Penn Foundation's Delaware Watershed Research fund. This dataset contains geomorphometry for streams and floodplains in the Chesapeake and Delaware River watersheds. Geomorphometry is a quantitative representation of landscape surface form (e.g., channel width and depth) obtained from digital elevation models (DEMs). This dataset contains geomorphometry derived from running 3-m DEMs through the Floodplain and Channel Evaluation Tool (FACET) version 0.1.0. FACET generates shapefiles and rasters of the stream network, cross sections, streambank point locations, floodplain extent, height above nearest drainage (HAND), and reach-scale summaries of bank height, channel width, floodplain width, and a suite of other metrics outlined in the data dictionary. These data were generated to aid in modeling the amount of sediment and nutrients trapped on floodplains or eroded from streambanks in the Chesapeake and Delaware River watersheds. Files are organized into folders by hydrologic unit code (HUC) for subbasins within the Chesapeake and Delaware watersheds. Each folder contains the following files within the main folder and a sub folder called "post processing." XXXX folder, where XXXX is a 4-digit HUC: Main [folder_name] files, where “folder name” is an 8- or 10-digit HUC: [folder_name]_bankpixels.tif [folder_name]_dem.tif [folder_name]_floodplain.tif [folder_name]_hand.tif [folder_name]_mask.shp [folder_name]_network.shp [folder_name]_network.tif [folder_name]_channel_xns.shp Post-processing folder files: bankpoints_1D_metrics.shp bankpoints_1D_metrics_all_stats.dbf channel_floodplain_2D_metrics.shp channel_floodplain_2D_metrics_all_stats.dbf floodplain_xns_1D_metrics.shp floodplain_xns_1D_metrics_all_stats.dbf Each file and associated attributes are described in the data dictionary listed in the Attached Files section. Merged files spanning the entire study area are included within the Child Item page called Chesapeake and Delaware Basin Combined Files. The combined files include a shapefile with the stream network and the floodplain extent, as well as a post-processing table with select stream and floodplain metrics.

Geomorphometry for Streams and Floodplains in the Chesapeake and Delaware Watersheds was generated as part of the project Quantifying Floodplain Ecological Processes and Ecosystem Services in the Delaware River Watershed funded through the William Penn Foundation's Delaware Watershed Research fund. This dataset contains geomorphometry for streams and floodplains in the Chesapeake and Delaware River watersheds. Geomorphometry is a quantitative representation of landscape surface form (e.g., channel width and depth) obtained from digital elevation models (DEMs). This dataset contains geomorphometry derived from running 3-m DEMs through the Floodplain and Channel Evaluation Tool (FACET) version 0.1.0. FACET generates shapefiles and rasters of the stream network, cross sections, streambank point locations, floodplain extent, height above nearest drainage (HAND), and reach-scale summaries of bank height, channel width, floodplain width, and a suite of other metrics outlined in the data dictionary. These data were generated to aid in modeling the amount of sediment and nutrients trapped on floodplains or eroded from streambanks in the Chesapeake and Delaware River watersheds. Files are organized into folders by hydrologic unit code (HUC) for subbasins within the Chesapeake and Delaware watersheds. Each folder contains the following files within the main folder and a sub folder called "post processing." XXXX folder, where XXXX is a 4-digit HUC: Main [folder_name] files, where “folder name” is an 8- or 10-digit HUC: [folder_name]_bankpixels.tif [folder_name]_dem.tif [folder_name]_floodplain.tif [folder_name]_hand.tif [folder_name]_mask.shp [folder_name]_network.shp [folder_name]_network.tif [folder_name]_channel_xns.shp Post-processing folder files: bankpoints_1D_metrics.shp bankpoints_1D_metrics_all_stats.dbf channel_floodplain_2D_metrics.shp channel_floodplain_2D_metrics_all_stats.dbf floodplain_xns_1D_metrics.shp floodplain_xns_1D_metrics_all_stats.dbf Each file and associated attributes are described in the data dictionary listed in the Attached Files section. Merged files spanning the entire study area are included within the Child Item page called Chesapeake and Delaware Basin Combined Files. The combined files include a shapefile with the stream network and the floodplain extent, as well as a post-processing table with select stream and floodplain metrics.

This data release contains predictions of stream biological condition as defined by the Chesapeake basin-wide index of biotic integrity for stream macroinvertebrates (Chessie BIBI) using Random Forest models with landscape data for small streams (≤ 200 km2 in upstream drainage) across the Chesapeake Bay Watershed (CBW). Predictions were made at eight time periods (2001, 2004, 2006, 2008, 2011, 2013, 2016, and 2019) according to changes in landcover using the National Land Cover Database (NLCD). The Chessie BIBI data used were provided by the Interstate Commission on the Potomac River Basin. Uncertainty was calculated using model prediction intervals. For complete data descriptions and data interpretation see associated publication (Maloney et al., 2022).