Accurate Underwater Data for Planning, Inspection, and Long-Term Asset Management
Brennan provides hydrographic surveys that combine bathymetric data and above-water imaging to support planning, inspection, verification, maintenance, and decision-making.
Built To See the Full Structure, Above & Below the Waterline Hydrographic Survey Services
Water-based infrastructure is often difficult to evaluate because so much of the asset is hidden below the surface. Hydrographic survey helps bring those conditions into focus.
Brennan uses advanced hydrographic survey technology to collect reliable data, map underwater conditions, identify areas of concern, classify submerged objects, and create detailed models that help project teams understand what is happening below the waterline. When paired with above-water imaging, these tools give clients a more complete view of structures, sites, and surrounding conditions.
Whether your project involves a bridge, dam, pier, terminal, intake, outfall, pipeline, dredging area, underwater obstruction, or marine construction site, Brennan provides the survey expertise and deliverables needed to support better decisions.
Survey Data That Supports Safer, Smarter Project Decisions Areas of Focus
Brennan provides hydrographic survey services for infrastructure owners, engineering teams, marine contractors, public agencies, energy facilities, environmental projects, and industrial waterfronts.
Dense, High-Resolution Data for Detailed Underwater Models Multibeam Surveys
Multibeam surveys collect dense, high-resolution bathymetric data that can be used to create precise 3D models of underwater conditions. This level of detail helps clients evaluate complex structures, identify risks, document site conditions, and support design or maintenance planning.
Brennan’s multibeam survey capabilities can also support fly-through visualizations, submerged object classification, BIM integration, volumetric analysis, and scour monitoring.
Key Capabilities
- Multibeam hydrographic survey
- High-resolution bathymetric data collection
- 3D underwater models
- Fly-through tours of underwater conditions
- Identification of areas of concern
- Submerged object classification
- Building information modeling support
- Volumetric analysis
- Scour monitoring
- Construction and repair planning support
Efficient Survey Support for Shallow-Water Conditions Single-Beam Surveys
Single-beam surveys provide accurate general depth information across a body of water and can be especially effective in shallow-water conditions. Brennan uses single-beam survey methods when project conditions, access limitations, scope, and data needs make this approach the right fit.
Single-beam survey equipment can also be mounted on Brennan’s ROVs, allowing our teams to collect data in confined or restricted areas that may be difficult to access with traditional survey vessels.
Key Capabilities
- Single-beam hydrographic survey
- Shallow-water survey support
- General depth information
- Bathymetric data collection
- ROV-mounted survey support
- Confined-area survey
- Restricted-access survey
- Pre- and post-construction surveys
- Dredging and inspection support
Above-Water Imaging That Completes the Model Terrestrial LiDAR & Photogrammetry
Many infrastructure projects require both underwater and above-water data. Brennan uses terrestrial LiDAR and photogrammetry to generate accurate point cloud imagery above the waterline. When combined with bathymetric data, these tools create a fuller structure model from top to bottom.
This is especially useful for bridges, dams, piers, waterfront structures, industrial facilities, and marine assets where the relationship between above-water and below-water conditions affects design, repair, inspection, and maintenance decisions.
Key Capabilities
- Terrestrial LiDAR
- Photogrammetry
- Above-water point cloud imagery
- Full structure modeling
- Combined bathymetric and above-water data
- Detailed infrastructure assessments
- Top-to-bottom structure documentation
- Engineering review support
- Long-term asset management support
Clearer Models for Complex Underwater Conditions 3D Modeling & Visualization
Hydrographic survey data becomes more useful when it can be understood, shared, and applied. Brennan creates detailed survey models that help clients visualize underwater conditions, review areas of concern, evaluate quantities, compare changes, and plan the next step.
3D models can support planning, construction design, scour monitoring, dredging, repair planning, inspection, and stakeholder communication.
Key Capabilities
- 3D survey models
- Underwater condition visualization
- Point cloud models
- Fly-through visualizations
- Structure and asset modeling
- Existing-condition documentation
- Change detection support
- Design and construction planning
- Owner and stakeholder communication
Data To Support Maintenance, Protection, and Repair Planning Scour Monitoring & Volumetric Analysis
Scour, erosion, sediment movement, and material buildup can affect bridges, piers, dams, terminals, intakes, outfalls, and other water-based infrastructure. Brennan’s hydrographic survey capabilities support volumetric analysis and scour monitoring to help clients understand how underwater conditions change over time.
This data can inform repair decisions, protection system design, dredging needs, maintenance planning, and long-term asset management.
Key Capabilities
- Scour monitoring
- Volumetric analysis
- Sediment volume calculations
- Erosion and deposition tracking
- Pre- and post-work comparisons
- Bridge and pier assessment support
- Dredge quantity support
- Protection system verification
- Long-term condition monitoring
Better Information Before Divers Enter the Water Survey Support for Underwater Inspections
Hydrographic surveys can improve underwater inspection planning by identifying hazards, mapping access constraints, locating areas of concern, and helping teams understand site conditions before divers enter the water.
Brennan’s survey teams work closely with our commercial divers, ROV operators, imaging specialists, and marine construction crews to improve safety, efficiency, and inspection quality.
Key Capabilities
- Pre-dive survey support
- Hazard identification
- Underwater feature mapping
- Inspection planning support
- ROV-mounted survey support
- Structure and obstruction mapping
- Diver support
- Underwater imaging coordination
- Post-inspection documentation
Reliable Data for Better Project Planning Survey Support for Construction & Design
Brennan supports construction design, planning, and verification with hydrographic survey data that helps project teams understand site conditions before work begins and document results after work is complete.
These services are especially valuable for marine construction, bridge work, dam repair, dredging, capping, terminal construction, pier rehabilitation, public waterfronts, and underwater infrastructure repairs.
Key Capabilities
- Existing-condition surveys
- Design support surveys
- Pre-construction surveys
- Progress surveys
- Post-construction surveys
- As-built support
- Construction verification
- Bathymetric mapping
- Utility and obstruction survey support
- Coordination with engineers and contractors
Clear Information Your Team Can Use Survey Reports & Deliverables
Survey work is only valuable if the final deliverables are clear, accurate, and easy to apply. Brennan provides survey reports built to support project planning, engineering review, contractor coordination, and future reference.
Survey deliverables may include detailed written results with verified quality checks, 3D models with screenshots for easy review, professional plan and elevation drawings, and raw data for future reference and comparison.
Key Capabilities
- Detailed written survey results
- Verified quality checks
- 3D models with screenshots
- Professional plan drawings
- Professional elevation drawings
- Raw survey data
- Bathymetric maps
- Point cloud data
- Comparison data for future reference
- Project-specific reporting packages
Hydrographic Survey for Water-Based Assets Infrastructure & Project Applications
Brennan provides hydrographic survey support across a wide range of water-based infrastructure and project types.
Common Applications
- Bridges
- Dams
- Piers
- Docks
- Terminals
- Intakes
- Outfalls
- Pipelines
- Public waterfronts
- Marinas
- Dredging projects
- Sediment capping projects
- Environmental remediation sites
- Coastal resilience projects
- Industrial waterfronts
- Energy infrastructure
- Marine construction projects
Advanced Survey Technology Backed By Marine Construction Expertise Why Brennan for Hydrographic Survey?
Brennan’s hydrographic survey services are grounded in practical field experience. Our team does more than collect data. We understand how that data will be used for inspection, design, construction, repair, dredging, scour monitoring, maintenance, and long-term asset management.
Because Brennan also provides commercial diving, underwater imaging, marine construction, environmental remediation, dam construction, and energy infrastructure services, our survey teams can coordinate directly with the people who will inspect, repair, build, or verify the work.
What Sets Brennan Apart
- Advanced hydrographic survey technology and certified hydrographers
- Award-winning safety performance in safety-critical environments
- Collaborative, honest delivery with owners, engineers, suppliers, contractors, regulators, and stakeholders
- Multibeam surveys for dense, high-resolution 3D models
- Single-beam surveys for shallow-water conditions and general depth information
- ROV-mounted single-beam survey capability for confined and restricted areas
- Terrestrial LiDAR and photogrammetry for above-water point cloud imagery
- Support for BIM integration, volumetric analysis, and scour monitoring
- Clear survey reports with quality checks, 3D models, plan drawings, elevation drawings, and raw data
- Integrated support from commercial diving, underwater imaging, and marine construction teams
Total Quality Management Across the Organization
- ISO 9001 (Quality Management Systems)
- ISO 14001 (Environmental Management)
- ISO 45001 (Occupational Health and Safety Management)
- ASME NQA-1 (2022), 10 CFR 50 Appendix B, and 10 CFR Part 21
Whether your project requires multibeam survey, single-beam survey, LiDAR, photogrammetry, scour monitoring, volumetric analysis, construction verification, underwater inspection planning, or detailed survey deliverables, Brennan has the technology, people, and field experience to help.
