R. Russell Lotspeich 20140101 vector digital data U.S. Geological Survey Scientific Investigations Map Series SIM2012_3213 Reston, VA US Geological Survey https://doi.org/10.5066/P9L8WXQ4 S.M. Wicklein R.R. Lotspeich R.B. Banks III 20140601 map Scientific Investigations Map 2012-3213 Reston U.S. Geological Survey https://pubs.usgs.gov/sim/3213/ Bathymetric data were collected using a boat-mounted Wide Area Augmentation System (WAAS), a type of differential global positioning system, echo depth-sounding equipment, and computer software. Data were exported into a geographic information system and converted into a point layer. These data points were used to create a triangulated irregular network (TIN) from which 2-foot contours were created. The contours were then clipped with a manually digitized outline of the reservoir shoreline and edited for errors. The resulting data was used for mapping purposes and for calculating area and volume statistics. The U.S. Geological Survey, in cooperation with the U.S. Marine Corps (USMC), conducted a bathymetric survey of Breckenridge Reservoir in March 2009. The survey was conducted to provide the USMC Natural Resources and Environmental Affairs with information regarding reservoir storage capacity and general bathymetric properties. The bathymetric survey can provide a baseline for future work on sediment loads and deposition rates for the reservoir. 2014 2014 Complete None planned -77.399680 -77.391155 38.548141 38.536067 USGS Thesaurus Hydrography Lake Reservior bathymetric contours InlandWaters ISO 19115 Topic Category geoscientificInformation environment inlandWaters Geographic Names Information System (GNIS) Breckenridge Reservoir Quantico, Virginia Stafford County, Virginia Prince William County, Virginia Gregorian calendar March 2009 USGS Metadata Identifier USGS:b0e5160d-5327-44c3-8dea-bc9e13b63ba4 None User must give credit to Wicklein, S.M , Lotspeich, R.R., and Banks III, R.B., U S Geological Survey, Virginia Water Science Center. U.S. Geological Survey R. Russell Lotspeic mailing and physical address

1730 East Parham Road

Richmond VA 23228-2202 USA 1-804-261-2600 rlotspei@usgs.gov 8-4 https://www.sciencebase.gov/catalog/file/get/6314061bd34e36012efa3971?name=Breck_contours.jpg Contours of lake elevation jpg Any use of trade, firm, or product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 9.3.1 Each attribute value within this layer has been examined to ensure it contains quality information. Elev_m Elevation of the bottom of Breckenridge Reservoir in meters, NAVD88. These elevations were converted from feet and have an accuracy of approximately 0.37 meters. Elev_ft Elevation of the bottom of Breckenridge Reservoir in feet, NAVD88. These elevations have an accuracy of approximately 1.2 feet. Original data was coordinate data with depth elevations. Standard ArcMap Spatial Analyst default environmental variables were used while creating the TIN and contours. All areas of the reservoir that were accessible by boat were sampled using GPS and ecosounder. The perimeter, or edges were surveyed for water surface elevations from the land surface. These data represent all wet areas for the reservoir during the time of survey. Horizontal accuracy of bathymetric point locations collected with Differential GPS was determined to be less than 10 feet. Bathymetric contour placement was determined by depth or bed elevations and interpolation to 2-foot contours in ArcGIS. Virginia Geographic Information Network 20071201 remote-sensing image These files contain Digital Orthophoto files for the State of Virginia developed from imagery acquired in spring 2006 and 2007. In the spring of 2006, the Commonwealth of Virginia, through the Virginia Geographic Information Network Division (herein referred to as VGIN) of the Virginia Information Technologies Agency (VITA) contracted with the Sanborn Map Company to provide aerial data acquisition, ground control, aerotriangulation and development of statewide DTM and digital orthophotography. Approximately 15% of the State was acquired in the year 2006 and the balance in 2007. All data acquired in 2006 is jurisdiction based. The data acquired in 2007 includes overlap along the boundaries of jurisdictions captured in the previous year 2006. This ensures each jurisdiction has full coverage from either Year 2006 or 2007 without 'mixing' imagery vintage along the edge of a jurisdiction. The project encompasses the entire land area of the Commonwealth of Virginia. The State boundary is buffered by 1000'. Coastal areas of the State bordering the Atlantic Ocean or the Chesapeake Bay are buffered by 1000' or the extent of man-made features extending from shore. The entire State was initially designed to support 1"=200' (1:2400) scale mapping. Jurisdictions throughout the State were provided an option to upgrade to a 1"=100' (1:1200) map scale. All data development processes for the DTM conform to the ASPRS Draft Aerial Photography Standards (1995) and Model Virginia Map Accuracy Standards (1992), which generally follow the ASPRS Accuracy Standard for Large-Scale Mapping (1990) for relevant mapping scales. The DTM supports the creation of 6-inch or 1-foot map orthoimagery at the relevant scales. https://www.vita.virginia.gov/isp/default.aspx?id=8412 Commonwealth of Virginia 2007 remote-sensing image Reston, Virginia Virginia Information Network https://www.vita.virginia.gov/isp/default.aspx?id=8412 200 remote-sensing image 20071201 publication date VBMP imagery remote-sensing image Bathymetric data were collected using a boat-mounted Differential GPS (DGPS) and echo depth-sounding equipment. The DGPS allowed for horizontal accuracies of less than 10 feet (ft; about 3 meters) in the horizontal direction. A depth check for vertical accuracy of the echo sounder was performed once at the beginning of the survey to ensure that the echo sounder was calibrated correctly. The primary dataset, which consisted of over 4,000 data points collected on March 30, 2009, was compared to a smaller dataset of 233 data points that were collected on February 24, 2009. Points from each survey that were collected within 1.5 ft of each other were considered coincidental and were paired for comparison. This process produced 32 coincidental pairs of points. The standard deviation of the depth measurement for the data point pairs was 1.2 bathymetric points 20090224 Depths were converted to elevations (NAVD88) based on surveyed water surface elevations at the time of data collection. Text file of coordinates and elevations were imported into a geographic information system for mapping.Processing was done with ArcGIS 9.3 bathymetric points 20090224 Manually digitized outline of the reservoir shoreline using 1:4800 scale imagery. Processing was done with ArcGIS 9.3 VBMP imagery 20090330 The 4,000 data points were used to create a triangulated irregular network (TIN) and 2-foot contours using ArcGIS Spatial Analyst Tools. The contours were clipped with the reservoir shoreline and edited where errors occurred with the contour generation process. Processing was done with ArcGIS 9.3, with default smoothing algorighm and fuzzy tolerances accepted bathymetric points 20090330 Metadata was created. Processing was done with ArcGIS 9.3 and edited with ArcGIS 10.0 20120622 Vector String 108 WGS 1984 UTM Zone 18N 0.9996 -75.0 0.0 500000.0 0.0 coordinate pair 0.000000002220024164500956 0.000000002220024164500956 Meter D WGS 1984 WGS 1984 6378137.0 298.257223563 Breck_Contour Shapefile containing Breckenridge Reservoir outline and bathymetric contours Dataset designer FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. 20120622 20120622 Shape Feature geometry. ESRI Coordinates defining the features. 20120622 20120622 ID Unique number for each contour line ESRI Sequential unique numbers that are automatically generated. elev_m Bathymetric contour NAVD88 elevation in meters Dataset designer 29.87 40.84 meters 0.01 20120622 20120622 0.3 Vertical accuracy of instrumentation used to collect data over varied terrain 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 This database, identified as Breckenridge_Countour_SIM2012_3213, has been approved for release and publication by the U.S. Geological Survey (USGS). 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. Any use of trade, firm, or product names is for descriptive purposes only, and does not imply endorsement by the U.S. Government. Digital Data https://doi.org/10.5066/P9L8WXQ4 None 20201117 U.S. Geological Survey Water Mission Area mailing

12201 Sunrise Valley Dr

Reston VA 20192 GS-W-model-data@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998