Michael E. Wieczorek Shannon E. Jackson Gregory E. Schwarz 2018 tabular digital data Reston, Virginia U.S. Geological Survey https://doi.org/10.5066/F7765D7V This tabular data set represents the presence of six National Hydrography Dataset (NHD) high resolution waterbody types compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. The six types of waterbodies presented here are: playa, ice mass, lake/pond, reservoir, swamp/marsh, and estuary. This dataset can be linked to the NHDPlus version 2 data suite by the unique identifier COMID. The source data is the NHDPlus high resolution waterbodies produced by USGS , 2015. Units are percent. Reach catchment information characterizes data at the local scale. Reach catchments accumulated upstream through the river network characterizes cumulative upstream conditions. Network-accumulated values are computed using two methods, 1) divergence-routed and 2) total cumulative drainage area. Both approaches use a modified routing database to navigate the NHDPlus reach network to aggregate (accumulate) the metrics derived from the reach catchment scale. (Schwarz and Wieczorek, 2018). This data set was created by the U.S. Geological Survey's (USGS) National Water-Quality Assessment Project (NAWQA) which is part of the USGS National Water Quality Program (NWQP). This effort was undertaken to estimate the for NHDPlusV2 flowline catchments and upstream river networks to support statistical analysis, map display, and model parameterization. The data processed here uses a modified routing data base for the NHDPlusV2 flowline network (ENHDPlusV2_us, Schwarz and Wieczorek, 2018). The NHDPlusV2 flowline network serves as the spatial infrastructure for many water-quality modeling efforts included under NAWQA Cycle 3 status and trend assessments including the SPARROW (SPAtially Referenced Regressions On Watershed attributes) model (Rowe and others, 2009). The NHDPlusV2 flowline network is a publically available digital geospatial framework (database) that depicts the network of stream segments and their catchments within the conterminous United States (see Moore and Dewald, 2016 for more detail). The NHDPlusv2 data set includes catchments for each reach covering the conterminous U.S. which includes the catchment boundaries in neighboring Canada and Mexico. These catchments are used as the spatial units for zonal statistics. A statistic (summation, average, minimum or maximum) is calculated for each zone (catchment), based on values from the source ancillary data set (See Process_Description for more details). The output of these values are used as the source input data for an accumulation program which uses a routing database to allocate and accumulate landscape metrics. This database (ENHDPlusV2_us) is based on a topologically reconditionedversion of the NHDPlusV2 hydrography network and is used for routing purposes only. No cartographic changes were made to the original NHDPlusV2 in either the flowline or catchment line work. 2016 publication date Complete As needed -127.910792 -65.327751 51.657387 23.243486 CONUS United States None NHD high resolution waterbodies playas estuaries ice SPARROW Inlandwaters NHDPlus Catchment NAWQA reservoirs ponds lakes swamps marshes reservoirs USGS Metadata Identifier USGS:57ab4009e4b05e859be1ad26 None Conterminous United States none One should use caution and read this document before using these data to estimate smaller areas. These data should not be used for site-specific evaluation, surveying, or engineering purposes. They should also not be used beyond the limits of the source data's scale. Use of this data is considered acceptance of the limitations of this data and that the user has read and understood this metadata prior to its use in any form. Michael E. Wieczorek US Geological Survey, Maryland Water Science Center mailing and physical

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Baltimore MD 21228 USA 443-498-5550 mewieczo@usgs.gov We would like to acknowledge the following USGS employees. The original conception and rationale for creating these data is from Robert Gilliom and Daren Carlisle. We also acknowledge Andrew LaMotte in helping to process and format much of this data as well as the helpful colleague reviews provided by Alison Appling and Daren Carlisle. We also would like to thank Dave Wolock, Curtis Price, Roland Viger, and Drew Ignazio for their invaluable input. Gary L. Rowe Kenneth Belitz Hedeff I. Essaid Robert J. Gilliom Pixie A. Hamilton Anne B. Hoos Dennis D. Lynch Mark D. Munn David W. Wolock 2009 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/of/2009/1296/pdf/OF09-1296.pdf Richard B. Moore Thomas G. Dewald 2016 American Water Resources Association (JAWRA) 1-10.DOI: 10.1111/1752-1688.12389 http://dx.doi.org/10.1111/1752-1688.12389 James A. Falcone Daren M. Carlisle David M. Wolock Michael R. Meador 2010 Ecology 91 (2), 621 Data Paper in Ecological Archives E091-045-D1 http://esapubs.org/Archive/ecol/E091/045/metadata.htm Basin metrics were compared to values for the same variables available in the GAGESII data set (Falcone, 2010). The following steps were performed before making the comparisons: 1) GAGESII point file with the most current COMIDs associations was joined to the routing database file which contains accumulated basin areas (Schwarz and Wieczorek, 2018). 2) Only those GAGESII basins that have a basin area within 1% or less of the accumulated basin areas were processed and used for comparisons. This resulted in 4,713 locations. 3) Using those COMIDs for GAGESII sites, the associated record in the accumulation files were pulled and used in the comparison of one to one plots. Results demonstrated a Pearson's r-squared well over 90%. Values that differed greatly between datasets can be attributed to either the difference in the basin delineations of GAGESII basins compared to that of the catchment representations in NHDPlus version 2 or to the fact that this data set only reports data from the downstream end of reaches and their upstream contribution. GAGESII basin outlets can occur anywhere along a reach segment which can produce different results depending on the variability of the source data being compiled and the distance between the GAGES II basin outlet and the downstream endpoint of the reach segment. NHDPlus version 2 reach segments can be as long as 95 kilometers and some source data can vary considerably within an NHDPlus reach catchment. As a result, some data processed from the location of a GAGESII pour point compared to the downstream end of a reach segment can result in differences in accumulated variables. None None No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted Earth Science Information Center, U.S. Geological Survey 2009 vector digital data Reston, VA the U.S. Geological Survey http://nhd.usgs.gov/data.html online 2009 publication date NHDWB_CONUS The source data provided information on by water bodies. Gregory E. Schwarz Michael E. Wieczorek 2018 tabular data Reston, VA U.S. Geological Survey https://www.sciencebase.gov/catalog/item/5718d2f8e4b0ef3b7cabdc17 online 2018 publication date nhdplusus_v2.sas The source data provided routing information for the NHDPlusV2 flow line network. U.S. Environmental Protection U.S. Geological Survey 2012 vector digital data Reston, VA U.S. Geological Survey http://www.horizon-systems.com/NHDPlus/NHDPlusV2_data.php online 2012 publication date NHDPlus The source data is the basic hydrologic framework used to process these data. 1) Downloaded the raster source data from http://nhd.usgs.gov/data.html . 2) Used the COMBINE command with source data and NHDPlusV2 catchment rasters. 3) Summed the area of waterbodies per NHDPlusV2 catchment by COMID. 4) An aggregation algorithm was performed on the assigned variables. See the metadata for "Database of Modified Routing for NHDPlus Version 2.1 Flowlines: ENHDPlusV2_US" by Schwarz and Wieczorek in Source_Information for more details on the routing databse. See the landing page for "Select Attributes for NHDPlus Version 2.1 Reach Catchments and Modified Network Routed Upstream Watersheds for the Conterminous United States" for a copy of the aggregation script and its details. 5) Exported results into a comma separated text file format. 20151221 Common Identifier Code for each catchment and reach segment (COMID) NHDWB_CAT_CONUS.txt comma separated tabular data ESRI COMID Unique ID to relate to each NHDPlus version 2 catchment and flow line. http://nhd.usgs.gov/NHDDataDictionary_model2.0.pdf Unique numbers that are automatically generated. CAT_PLAYA Percent of NHDPlusV2 catchment that contains playas. -9999 denotes flowline reach has no catchment. U.S. Geological Survey 0.0 100 percentage CAT_ICEMASS Percent of NHDPlusV2 catchment that contains ice mass. -9999 denotes flowline reach has no catchment. U.S. Geological Survey 0.0 94.64 percentage CAT_LAKEPOND Percent of NHDPlusV2 catchment that contains lakes or ponds. -9999 denotes flowline reach has no catchment. U.S. Geological Survey 0.0 100 percentage CAT_RESERVOIR Percent of NHDPlusV2 catchment that contains reservoirs. -9999 denotes flowline reach has no catchment. U.S. Geological Survey 0.0 100 percentage CAT_SWAMPMARSH Percent of NHDPlusV2 catchment that contains swamps or marshes. -9999 denotes flowline reach has no catchment. U.S. Geological Survey 0.0 100 percentage CAT_ESTUARY Percent of NHDPlusV2 catchment that contains estuaries. -9999 denotes flowline reach has no catchment. U.S. Geological Survey 0.0 100 percentage NODATA Estimated percentage of catchment that does not contain the source coverage. U.S. Geological Survey 0.0 100 percentage NHDWB_ACC_CONUS.txt comma separated tabular data ESRI COMID Unique ID to relate to each NHDPlus version 2 catchments and flow line. http://nhd.usgs.gov/NHDDataDictionary_model2.0.pdf Unique numbers that are automatically generated. ACC_PLAYA Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains playas, based on divergence routing. U.S. Geological Survey -9999 100 percentage ACC_ICEMASS Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains ice mass, based on divergence routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 94.64 percentage ACC_LAKEPOND Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains lakes or ponds, based on divergence routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage ACC_RESERVOIR Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains reservoirs, based on divergence routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage ACC_SWAMPMARSH Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains swamps or marshes, based on divergence routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage ACC_ESTUARY Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains estuaries, based on divergence routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage ACC_NODATA Estimated percentage of catchments that does not contain the source coverage, based on divergence routing. U.S. Geological Survey 0.0 100 percentage NHDWB_TOT_CONUS.txt comma separated tabular data ESRI COMID Unique ID to relate to each NHDPlus version 2 catchments and flow line. http://nhd.usgs.gov/NHDDataDictionary_model2.0.pdf Unique numbers that are automatically generated. TOT_PLAYA Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains playas, based on total upstream routing. U.S. Geological Survey -9999 100 percentage TOT_ICEMASS Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains ice mass, based on total upstream routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 94.64 percentage TOT_LAKEPOND Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains lakes or ponds, based on total upstream routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage TOT_RESERVOIR Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains reservoirs, based on total upstream routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage TOT_SWAMPMARSH Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains swamps or marshes, based on total upstream routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage TOT_ESTUARY Estimated accumulated percentage of all upstream NHDPlusV2 catchments that contains estuaries, based on total upstream routing. -9999 denotes flow line reach is disconnected to the network and cannot be accumulated. U.S. Geological Survey -9999 100 percentage TOT_NODATA Estimated percentage of catchments that does not contain the source coverage, based on total upstream routing. U.S. Geological Survey 0.0 100 percentage Michael E. Wieczorek U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 443-498-5550 mewieczo@usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. 20260326 Michael Wieczorek US Geological Survey mailing and physical

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Baltimore Maryland 21228 USA 443-498-5550 mewieczo@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998