Paul A. Ensminger 20250515 vector digital data Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9TV9MZC This vector data set represents the inner wall polylines used to hydrologically condition the digital elevation model within the Louisiana StreamStats study area. Data were obtained in order to support the U.S. Geological Survey (USGS) for basin delineation database in Louisiana, and for incorporation into the Louisiana StreamStats application. These data were developed as part of a USGS study, done in cooperation with the Louisiana Department of Transportation, to delineate drainage areas for user-selected locations on streams, and then determine basin characteristics and estimates of flow statistics for the selected locations within the Louisiana StreamStats application. 2024 publication date Complete None planned -96.1468 -86.9853 34.2678 28.7880 ISO 19115 Topic Category inlandWaters geoscientificInformation elevation environment USGS Thesaurus Digital Elevation Models DEM Topography streamflow hydrology geospatial datasets geospatial analysis hydrology water resources Geographic INformation Systems GIS USGS Metadata Identifier USGS:66d718d6d34eef5af66ca5e5 Geographic Names Information System (GNIS) Louisiana United States None Although these data have been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior, no warranty expressed or implied is made by the USGS as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This dataset may be redistributed if it is not edited and is properly referenced. Although USGS intends to make this server available 24 hours a day, seven days a week, timely delivery of data and products from this server through the Internet is not guaranteed. Paul A Ensminger U.S. Geological Survey, Southeast Region Hydrologist mailing and physical address

3535 S Sherwood Forest

Baton Rouge LA 70816 USA 225-298-5481 225-298-5490 paensmin@usgs.gov Compilation of this data set and the associated metadata was done in cooperation with Louisiana Department of Transportation. No formal attribute accuracy tests were conducted. The logical consistency topologically is clean. Chain-node topology is present. All polylines were checked for overlaps and duplicate features sing Esri planarize and topology functionality. Data set 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. No formal positional accuracy tests were conducted. No formal positional accuracy tests were conducted. U.S. Geological Survey, National Geospatial Program 20190701 vector digital data Reston, Va U.S. Geological Survey (USGS) https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/NHD/HU4/ https://www.usgs.gov/national-hydrography https://www.usgs.gov/the-national-map-data-delivery online 20190321 Download Date NHD Spatial and attribute data NHDArea, NHDWaterbodies, NHDFlowline, WBDHU12 and WBDHU8 spatial and attribute data U.S. Geological Survey, National Geospatial Program 20181025 raster digital data Reston, VA U.S. Geological Survey https://nationalmap.gov/elevation.html http://nationalmap.gov/viewer.html https://apps.nationalmap.gov/downloader/ https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/13/ https://www.usgs.gov/tools/download-data-maps-national-map raster digital data 2024*** Download Date NED source data USGS National Hydrography Datasets (NHD), National Elevation Datasets (NED, aka Digital Elevation Model (DEM)), Hydrologic Unit 8 (HU8) and the Hydrologic Unit 12 (HU12) geodatabases covering Louisiana were downloaded from The National Map, National Geospatial Program, U.S. Geological Survey. Each HU8 was projected into USA Contiguous Albers Equal Area Conic USGS (WKID 102039) using the Esri ‘Project’ tool. This NED, NHD,and HU12 inwall datasets for each 8-digit Hydrologic Unit (HU) polygon in Louisiana were partitioned and merged into separate watershed HU8 watershed folders covering Louisiana's Watershed. For each HU8 contains multiple HU12 watersheds or inwalls were reviewed and sometimes modified based on the DEM flow accumulation flowline raster image, basmaps, aerial photographs within each individual HU8 guiding the best selections of inwalls, flowlines and pour points. All HU8 inwall layers were merged into a statewide MergeInwall shapefile. Digital Elevation Model National Elevation Dataset 20211110 NHD Vector String 4749 USA Contiguous Albers Equal Area Conic USGS version 29.5 45.5 -96.0 23.0 0.0 0.0 coordinate pair 0.0001 0.0001 meters D North American 1983 GRS 1980 6378137.0 298.257222101 LA_MergeInwall.shp Attribute Table A table containing attribute information for polyline features representing inner wall information for Louisiana StreamStats Producer Defined FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Shape type. Shape_Le_1 Length of feature in internal units. Producer Defined 0.010143468734 97041.6836394 U.S. Geological Survey - ScienceBase mailing and physical address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Esri File geodatabase 10.0 WinZip https://doi.org/10.5066/P9TV9MZC No fees are applicable for obtaining the data set. 20250515 Paul A. Ensminger U.S. Geological Survey Mailing and physical address

3535 S Sherwood Forest

Baton Rouge LA 70816 USA 1-225-298-5480 paensmin@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998