C. W. Bill Young Regional Reservoir in Hillsborough County, Florida
Client
Tampa Bay Water and Gannett Flemming, Inc.
Time Frame
April 28 thru May 7, 2025
Completion
May 7, 2025
Main Project Tasks
Degrove Surveyors, Inc. completed a comprehensive hydrographic survey of the C.W. Bill Young Regional Reservoir for Tampa Bay Water to support ongoing reservoir management and infrastructure evaluation. Field operations were conducted between April 28 and May 7, 2025.
The project included full multibeam bathymetric mapping, side scan sonar imaging, and detailed profiling of three submerged aeration (DA/D) pipelines within the reservoir. Using RTK GPS positioning, motion reference sensors, multibeam echosounders, and side scan sonar, our team collected high-density data to produce an accurate Digital Terrain Model (DTM) of the reservoir bottom.
All survey control was referenced to NAD83 (2011), Florida State Plane West (US Survey Feet), with elevations tied to NAVD29. Daily positional checks and sonar calibration (patch testing) were performed to verify accuracy throughout the project. Multibeam data achieved full overlap coverage in navigable areas and was processed in HYPACK, with final surfaces generated in AutoCAD Civil 3D.
In addition to bathymetric mapping, Degrove Surveyors performed specialized pipeline detection surveys on three submerged DA/D aeration lines. These lines were surveyed using multibeam pipeline detection mode to determine both horizontal alignment and vertical clearance from the reservoir bottom. Profile analyses showed consistent burial depths, averaging approximately 2.3 to 2.4 feet from reservoir bottom to top of pipe, with tight standard deviations—providing Tampa Bay Water with critical insight into pipeline condition and exposure risk.
Side scan sonar data was processed into a high-resolution mosaic to identify bottom features and verify infrastructure locations. All data underwent rigorous QA/QC, anomaly review, and reprocessing where required to ensure a defensible final deliverable.
Deliverables Included:
High-density multibeam XYZ point files for terrain modeling
AutoCAD Civil 3D surfaces and drawings
Side scan sonar GeoTIFF mosaics and trackline maps
Pipeline alignment maps and profile exhibits
Excel stationing tables with reservoir and pipe elevations
Final signed hydrographic survey report meeting Florida Professional Standards
This project demonstrates Degrove Surveyors’ ability to integrate advanced hydrographic technologies with traditional surveying standards to deliver accurate, actionable data for large-scale water infrastructure systems.
Degrove was tasked with completing a vessel offset survey of the Gerry Bordelon, while at Dry Dock in Port Fourchon, Louisiana.
Main Project Tasks
Degrove was tasked to provide all sensor offsets that would be used in Hydrographic Survey Operations. This was completed, utilizing a Leica Total Station, and performing resections to determine sensor locations, underneath the vessel, as well as on the back deck of the vessel. All coordinates were delivered in a local vessel reference frame and referenced to the Vessel Reference Point, that was specified by the client.
The purpose of this survey was to complete
a Multibeam and Singlebeam survey
of part of the St. Johns River within approximately 900 feet of the shore,
at the former JEA Southside Generating Station.
Main Project Tasks
Degrove completed a Multibeam and Singlebeam Survey, of part
of the St. Johns River in
Jacksonville, Florida.
The survey was completed utilizing a Reson T20 high
resolution multibeam sonar for swath bathymetry, an Odom CV100 200kHz singlebeam
sonar and a POS MV Surfmaster Inertial Measurement Unit (IMU), for motion
correction and positioning. 100%
coverage was achieved in areas where the multibeam sonar was utilized and the singlebeam
sonar was utilized to supplement the multibeam data.
Degrove was tasked with completing a Hydrographic and Topographic survey, of the Sea Ray Drive Bridge and Sykes Creek, to support planned replacement or repair of the bridge damaged, by Hurricane Irma.
Main Project Tasks
Degrove was tasked with completing a multi-beam sonar survey
of Sykes Creek, at the Sea Ray Road Bridge. Coverage included full channel width.
The bottom, in areas shallower than 3 feet in depth, were surveyed by means of
tilting the sonar head 30 degrees. The survey was completed utilizing a Reson
T50 high resolution multibeam sonar, for swath bathymetry, and a POS MV
Surfmaster Inertial Measurement Unit (IMU), for motion correction and
positioning.
The survey requirements included the necessity for 25%
overlap of swath data between adjacent lines. Due to the limited area of the
survey, 100% overlap was attained in most areas.
A topographic site survey, of the Sea Ray Drive Bridge and
the shore of Sykes Creek, was also completed.
A total station was used to collect data on hard surfaces as well as
under the bridge. Enough data was collected via the total station to overlap
hydrographic data, as a quality control check.
C. W. Bill Young Regional Reservoir in Hillsborough County, Florida
Client
Tampa Bay Water and Gannett Flemming, Inc.
Time Frame
10 July 2018 thru 13 July 2018
Completion
13 July 2018
Scope
Degrove was tasked with completing multibeam and side scan surveys of the C. W. Bill Young Regional Reservoir. Coverage included the complete reservoir to 4 feet below the sonar head.
Main Project Tasks
Degrove was tasked with completing multibeam and side scan surveys of the C. W. Bill Young Regional Reservoir. Coverage included the complete reservoir to 4 feet below the sonar head. The survey was completed utilizing a Reson 8125 high resolution multibeam sonar for swath bathymetry, an EdgeTech 4125 side scan sonar and a POS MV Surfmaster Inertial Measurement Unit (IMU) for motion correction and positioning. The RTK/GPS corrections were supplied by a Dual Frequency GPS receiver set on a nearby control point transmitting GPS corrections to the POS MV via cellular modem from the monument established by the control survey. A patch test was performed prior to commencement of the survey to calibrate the system. Sound Velocity readings were taken periodically during the survey with an Odom Digibar to correct for speed of sound during processing. The horizontal and vertical system offsets were verified by checking in over a known control point while the boat was still on the trailer. The survey requirements included the necessity for 25% overlap of swath data and 100% overlap for the side scan data. The hydrographic data was collected and processed with Hypack and Hysweep hydrographic software.
