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 the number of buildings and their construction dates within the 15 study watersheds in Gwinnett County, Georgia. Dataset reflects existing buildings as of October 2021 and construction dates range from 1810 to 2021. The dataset was created by matching parcel boundaries obtained from Gwinnett County with building construction dates from the Gwinnett County Cadastral database. Building densities were calculated for each watershed and year to estimate temporal changes in watershed building densities. The purpose of this dataset is to provide the building and construction date data for the 15 Gwinnett County study watersheds. This data was used to calculate the average building construction year and to estimate temporal changes in building densities from 1950 to 2020 for 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. 202110 publication date Complete None planned -84.2721 -83.8468 34.1514 33.7676 ISO 19115 Topic Category structure imageryBaseMapsEarthCover Alexandria Digital Library Feature Type Thesaurus buildings Marine Realms Information Bank (MRIB) keywords watershed USGS Thesaurus land use and land cover USGS Metadata Identifier USGS:63503df0d34e47431c15c5a6 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; 06_GwinnettCoGa_BuildingDensity.csv 81 KB Building construction years were available for 99.6 percent of the property records intersecting with the study watersheds. Small portions of four of the study watersheds extend outside of Gwinnett County and the number of buildings and building densities reflect the areas within the county. The cumulative number of buildings and building densities for years prior to 2021 represents a lower limit because the dataset reflects buildings existing as of October 2021 and does not account for some older buildings that have been destroyed or replaced by newer buildings. The number of buildings and building densities are less accurate as one goes back further in time as older buildings are more likely to have been destroyed or replaced. 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. Gwinnett County Informational Technology Services 202110 tabular digital data https://www.gwinnettcounty.com/web/gwinnett/departments/informationtechnologyservices/geographicinformationsystems/gisdataandmapsales/-/mapsales/product/GIS_SET-1 Digital and/or Hardcopy 202110 publication date Cadastral database Building construction years used to estimate temporal changes in watershed building densities Parcel boundaries were obtained from Gwinnett County in December 2021. Building construction dates were determined from the Gwinnett County Cadastral database representing October 2021 (Cadastral database), which were then matched to the parcels using their assigned PIN. Building construction years were available for 99.6 percent of the property records intersecting with the study watersheds. Average building construction year for each watershed was calculated as the average year built of parcels in the watershed. Building data was determined for 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.” Small portions of four study watersheds extend outside of the county boundary (Yellow River near Snellville [3.0] and near Lithonia [2.5] Suwanee Creek [4.6] and Crooked Creek [1.3] watersheds; percentage of watershed area outside of county in square brackets). For these basins, the number of buildings reflect the areas within Gwinnett County and building densities were calculated based on the area of the watershed within the county. Data was processed in January 2022. Cadastral database 202201 06_GwinnettCoGa_BuildingDensity.csv Comma Separated Value (CSV) file containing the number of buildings, construction year, and building densities 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 Year Building construction year. Years that did not have buildings with construction dates at any of the watersheds were excluded Producer Defined 1810 2021 year 1 NBuild Number of buildings in the corresponding watershed within Gwinnett County with the corresponding construction year Producer Defined . No buildings with that construction year for the corresponding watershed Producer defined 1 5725 buildings 1 CumNBuild Cumulative number of buildings. This is the number of buildings in the watershed drainage area within Gwinnett County with construction years equal to or before the corresponding building construction year Producer Defined 0 118537 buildings 1 BuildDens Watershed building density. This is the cumulative number of buildings for that year divided by the watershed drainage area within Gwinnett County Producer Defined 0.0 1072.5 buildings per quare mile 0.1 This dataset contains the number of buildings and their construction dates in the 15 study watersheds in Gwinnett County, Georgia in October 2021. The dataset was created by matching parcel boundaries obtained from Gwinnett County with building construction dates from the Gwinnett County Cadastral database (Gwinnett County Information Technology Services, 2021). The dataset contains building data only for Gwinnett County, while 4 watersheds have small areas outside the county area. Construction dates range from 1810 to 2021. Building densities for each year were calculated as the number of buildings divided by the watershed area within Gwinnett County. The cumulative number of buildings and building densities for years prior to 2021 represents a lower limit because the dataset reflects buildings existing as of October 2021 and does not account for some older buildings that have been destroyed or replaced by newer buildings. Gwinnett County Informational Technology Services, 2021, Cadstral data, October 2021, accessed December 2021, at https://www.gwinnettcounty.com/web/gwinnett/departments/informationtechnologyservices/geographicinformationsystems/gisdataandmapsales/-/mapsales/product/GIS_SET-1. 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