Attachment_1_Statement_of_Work.pdf

The Lower Mississippi-Gulf Water Science Center (LMGWSC) proposes a comprehensive bathymetric and topographic data collection project for Lake Pushmataha in east-central Mississippi. This project will integrate bathymetry and topography data to create a Digital Elevation Model (DEM) for the Bureau of Reclamation (BOR). While LMGWSC possesses the expertise and resources to conduct high-resolution bathymetric surveys, the acquisition of large-scale topographic data spanning approximately one square mile exceeds its current capabilities, necessitating external assistance. Therefore, an aerial lidar survey is essential for collecting the necessary topographic data due to its efficiency and cost-effectiveness. Updated topographic data is critical, as the last survey was conducted over a decade ago, and recent changes in the dam's morphology and status must be accurately captured. The integrated dataset will support BOR in making informed decisions for the design and safety rehabilitation of Lake Pushmataha Dam, a high-hazard facility as classified by the Indian Dams Safety Act of 1994. Failure of the dam would jeopardize lives along Jones Creek within a 6.6-mile reach downstream to the Pearl River and further downstream to the town of Edinburgh, impacting several road crossings. In summary, the collection of updated topographic lidar data is crucial to design critical dam safety improvements.

The requirements of the topographic dataset must meet specific data accuracy and resolution requirements defined by the BOR. Because the topographic data will be combined with the bathymetric data collected by the LMGWSC, the LMGWSC also has specific requirements that will facilitate integration of the two types of datasets. The LMGWSC is requesting a vendor that can collect aerial lidar at Lake Pushmataha and deliver a dataset that satisfies the following requirements:

• The vendor shall collect the data within the first quarter of fiscal year 2025 (October 1 – December 31) and after leaf-off.

• The vendor shall collect full topographic data coverage of the area surrounding Lake Pushmataha up to 0.25 miles from the shoreline unless otherwise obstructed by private property. A study area boundary file will be provided by LMGWSC that specifies where data collection is required.

• The lidar sensor employed for the survey must be capable of collecting seven or more returns per pulse.

• The final point dataset must be provided in .las file format and projected in the applicable Universal Transverse Mercator (UTM) Coordinate System. The vertical datum for the final point dataset shall be the North American Vertical Datum of 1988 (NAVD88) in units of U.S. survey feet.

• Each point in the las dataset must be classified with one of the following classifications:

Ground, vegetation, structure/building, powerlines, noise, powerline, or water.

• The final point dataset must contain a minimum point spacing of 200 points per square meter or better, on average. The point spacing on the dam between the left and right abutment shall exceed 400 points per square meter.

• The vertical and horizontal accuracy of the post-processed dataset must average 0.1 ft (~3

cm) or better.

• The point dataset must be accompanied by reporting of root mean square average of vertical and horizontal accuracy.

• The .las file shall be accompanied by a metadata XML compliant with the FGDC Content Standard for Digital Geospatial Metadata (CSDGM) or the International Organization for Standardization (ISO) suite of standards. Mandatory metadata elements are to be included (filled out and complete) in the XML metadata and verified for accuracy with the USGS metadata parser: Metadata Parser | U.S. Geological Survey (usgs.gov).

• The final, post-processed .las file and accompanying metadata will be delivered by February 1, 2025.

• Vendor operations and equipment are National Defense Authorization Act (NDAA) compliant.

• The vendor has demonstrated previous work experience with a federal agency.

• The vendor’s equipment is not limited by flight time such that the entire survey area can be surveyed in a day or less while adhering to the other outlined requirements.