Brent T. Aulenbach Joshua C. Henley Kristina G. Hopkins 20230404 tabular digital data Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9G8HZTY Brent T. Aulenbach Joshua C. Henley Kristina G. Hopkins 2023 publication USGS Scientific Investigations Report 2023-5035 Reston, Virginia U.S. Geological Survey This dataset contains population densities of 15 study watersheds in Gwinnett County, Georgia from 2000 to 2020. Population densities were determined for 2000, 2010, and 2020 from the decadal U.S. Census and for 2012 and 2017 from the American Community Survey 5-year estimates of 2010-14 and 2015¬-19 block group data, respectively. Population density within each watershed was determined by clipping the census block group data by the watershed boundaries and area-weighting the block group population density data within each watershed. Census block group data is the smallest geographic unit for which the census provides data. The purpose of this dataset is to provide the population density data for the 15 Gwinnett County watersheds over the 2000 to 2020 period. These population densities were used to present differences and changes in population of the study watersheds in the U.S. Geological Survey (USGS) Scientific Investigations Report "Hydrology, water-quality, and watershed characteristics in 15 watersheds in Gwinnett County, Georgia, 2002-20". This study is part of a long-term program to monitor and analyze the hydrologic and water-quality conditions of 15 watersheds in Gwinnett County, Georgia by the USGS in cooperation with Gwinnett County Department of Water Resources. 2000 2020 publication date Complete None planned -84.2721 -83.8468 34.1514 33.7676 ISO 19115 Topic Category society USGS Thesaurus population (human) Marine Realms Information Bank (MRIB) keywords watershed USGS Metadata Identifier USGS:63503e30d34e47431c15c5aa Geographic Names Information System Gwinnett County State of Georgia None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Brent T Aulenbach U.S. Geological Survey, Southeast Region Research Hydrologist mailing address

1770 Corporate Drive Suite 500

Norcross GA 30093 US 678-924-6626 678-924-6710 btaulenb@usgs.gov Funded through a cooperative agreement between Gwinnett County Department of Water Resources and the U.S. Geological Survey MacOS Big Sur, version 11.7.1; Microsoft Excel for Mac, version 16.67, 07_GwinnettCoGa_PopulationDensity.csv 1 KB Watershed population densities were derived from census block group data, which is the smallest geographic unit for which the census provides data and limits the spatial resolution of population density estimates. The American Community Survey (ACS) 5-year estimates have less temporal resolution than the decadal census estimates because the ACS data is compiled over a 5-year period. These 5-year estimates, however, are the most reliable interim population estimates for analyzing very small populations, such as in the smaller watersheds in this study, because data is collected for all areas and it has the largest sample size of the interim 1-, 3-, and 5-year American Community Survey estimates. See the process step for more details. No formal logical accuracy tests were conducted. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. U.S. Census Bureau 202203 application/service https://www.census.gov/geo/maps-data/data/tiger-data.html Digital and/or Hardcopy 2000 2020 publication date U.S. Census Bureau Population census block group data Population density within the study area was determined for 2000, 2010, and 2020 from the decadal U.S. Census and for 2012 and 2017 from the American Community Survey 5-year estimates of 2010-14 and 2015-19 block group data, respectively (U.S. Census Bureau). For the American Community Survey 5-year estimates, the center year of the 5-year period was used as the representative date. Watershed population densities were calculated from census block group data, which is the smallest geographic unit for which the census provides data. Block group size varies with population density, and each group generally contains between 600 and 3,000 people with an optimum size of 1,500 people. Population density was determined within each of the 15 study watersheds using the drainage areas shapefile 01_GwinnettCoGa_Watersheds_StreamStats.shp on child page “01: Watersheds shapefile for the 15 study watersheds in Gwinnett County, Georgia.” Watershed population density was determined by clipping the census block group data by the watershed boundaries and area-weighting the block group population density data within each watershed. This methodology assumes that population density is uniform throughout the census block. Even though population density is not always uniform, this approach should reasonably estimate the population density of the watersheds, particularly in areas where the block group sizes are small or when blocks are predominantly within a single watershed. Population estimates may be less precise for smaller study watersheds and inconsistent population patterns can result when census blocks groups are redefined. U.S. Census data was downloaded and processed March 2022. U.S. Census Bureau 202203 07_GwinnettCoGa_PopulationDensity.csv Comma Separated Value (CSV) file containing population density data for the 15 study watersheds in Gwinnett County, Georgia Producer Defined Watershed Watershed names used in the associated U.S. Geological Survey Scientific Investigations Report. Watershed drainage area defined by site specified in value definition shown in parentheses Producer Defined Wildcat Creek Wildcat Creek near Lawrenceville, Ga. (USGS site number 02205000) Producer defined Sweetwater Creek Sweetwater Creek at Club Drive near Lilburn, Ga. (USGS site number 02205865) Producer defined Yellow River near Snellville Yellow River near Snellville, Ga. (USGS site number 02206500) Producer defined Yellow River near Lithonia Yellow River at Ga 124, near Lithonia, Ga. (USGS site number 02207120) Producer defined No Business Creek No Business Creek at Lee Road, below Snellville, Ga. (USGS site number 02207185) Producer defined Big Haynes Creek Big Haynes Creek at Lenora Road, near Snellville, Ga. (USGS site number 02207385) Producer defined Brushy Fork Creek Brushy Fork Creek at Beaver Road, nr Loganville, Ga. (USGS site number 02207400) Producer defined Alcovy River Alcovy River at New Hope Road, near Grayson, Ga. (USGS site number 02208150) Producer defined Wheeler Creek Wheeler Creek at Bill Cheek Road, near Auburn, Ga. (USGS site number 02217274) Producer defined Apalachee River Apalachee River at Fence Road, near Dacula, Ga. (USGS site number 02218565) Producer defined Richland Creek Richland Creek at Suwanee Dam Road, near Buford, Ga. (USGS site number 02334480) Producer defined Level Creek Level Creek at Suwanee Dam Road, near Suwanee, Ga. (USGS site number 02334578) Producer defined Suwanee Creek Suwanee Creek at Suwanee, Ga. (USGS site number 02334885) Producer defined Crooked Creek Crooked Creek near Norcross, Ga. (USGS site number 02335350) Producer defined North Fork Peachtree Creek North Fork Peachtree Creek at Graves Rd, near Doraville, Ga. (USGS site number 02336030) Producer defined Study area Study watersheds area Producer defined DrainArea Drainage area of the watershed or the combined study watersheds area Producer Defined 1.27 306.58 square miles 0.01 PopDen2000 Population density in 2000. From U.S. Census Bureau decadal census Producer Defined 472.8 2395.5 people per square mile 0.1 PopDen2010 Population density in 2010. From U.S. Census Bureau decadal census Producer Defined 871.5 3505.0 people per square mile 0.1 PopDen2012 Population density in 2012. From U.S. Census Bureau 5-year American Community Survey census, 2010-2014 Producer Defined 918.3 3408.5 people per square mile 0.1 PopDen2017 Population density in 2017. From U.S. Census Bureau 5-year American Community Survey census, 2015-2019 Producer Defined 1351.9 4339.3 people per square mile 0.1 PopDen2020 Population density in 2020. From U.S. Census Bureau decadal census Producer Defined 1111.1 4424.4 people per square mile 0.1 This dataset contains the population density of 15 study watersheds in Gwinnett County, Georgia from 2000 to 2020. Population density was determined for 2000, 2010, and 2020 from the decadal U.S. Census and for 2012 and 2017 from the American Community Survey 5-year estimates of 2010-14 and 2015-19 block group data, respectively (U.S. Census Bureau, 2022). Population density within each watershed was determined by clipping the census block group data by the watershed boundaries and area-weighting the block group population density data within each watershed. U.S. Census Bureau, 2022, American community survey 5-year estimates block group and decadal census data: U.S. Census web page, accessed March 2022 at https://www.census.gov/geo/maps-data/data/tiger-data.html. U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), 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. Digital Data https://doi.org/10.5066/P9G8HZTY None 20230404 Brent T Aulenbach U.S. Geological Survey, Southeast Region Research Hydrologist mailing address

1770 Corporate Drive Suite 500

Norcross GA 30093 US 678-924-6626 678-924-6710 btaulenb@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998