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Hinterland Group Inc. Updated August 04, 2026

CCTV Laser Profiling and Sonar for Large‑Diameter Assets

Introduction

Hinterland Group performs multi‑sensor inspection (MSI) for large‑diameter water, wastewater, and stormwater assets by combining high‑resolution CCTV, laser profiling, and sonar—supplemented by LiDAR and aerial/drone assessments where appropriate. These methods support condition assessment, design‑level rehabilitation planning, and post‑construction verification across the southeastern United States. See our core Inspection services and PRIME framework in Services.

When to use CCTV + Laser + Sonar

Use a multi‑sensor workflow when any of the following apply:

  • Diameters from 4 to 108 inches, including large sewers, storm culverts, interceptors, force mains taken out of service for inspection, and outfalls. Our rehabilitation practice routinely serves this full range, and our inspection program mirrors those capabilities. CIPP Florida, CIPP Georgia, CIPP North Carolina, CIPP South Carolina

  • Partial or full flow conditions where solids or standing water obscure the invert; sonar quantifies submerged conditions while CCTV documents defects above the waterline. Inspection

  • Long, critical assets where geometric changes (deflection, ovality, deformation) must be measured for rehabilitation design and risk reduction. Pipe Rehabilitation

  • Post‑storm assessments when access is limited; we pair MSI with LiDAR, drone surveys, and rapid triage. Hurricane recovery diagnostics

Methodology

Our workflow aligns inspection with downstream rehabilitation and maintenance planning.

Pre‑inspection setup

  • Cleaning and access: Vactor cleaning and debris removal to establish clear lines of sight and accurate sonar returns. Inspection

  • Flow control and bypass: In‑house bypass design, installation, and operation maintain service continuity and safe inspection conditions. Repair and Replacement

  • Safety and entry planning: Confined‑space procedures led by OSHA‑certified staff within a mature safety program. About

Data capture and sensors

  • CCTV: Defect identification, infiltration indications, joint conditions, service laterals, and construction features captured by robotic platforms. Inspection

  • Laser profiling: Quantifies internal geometry above the waterline to evaluate ovality, deflection, and localized deformation for design inputs. Pipe Rehabilitation

  • Sonar: Maps the submerged invert to measure debris, sediment, and scour where optical methods cannot. Inspection

  • LiDAR and aerial support: Used in large conduits or complex corridors for rapid damage mapping after extreme events. Hurricane recovery diagnostics

QA/QC and traceability

  • Calibration checks for each sensor prior to deployment and verification against known references in the asset.

  • Chainage/stationing logged with synchronized sensor streams to support reproducibility and design take‑offs.

  • Independent review of observations and measurements before report issuance. Evaluation and Assessment

Deliverables and sample outputs

We package engineering‑ready outputs for planning, design, and construction. Example contents include the following.

Deliverable Example contents
Executive summary Asset list, inspection dates, access points, flow/bypass notes
CCTV defect log Location (stationing), defect type/extent, infiltration sources, lateral locations, manhole observations
Laser geometry Ovality and deflection profiles, diameter change mapping, deformation hot spots, clearance checks for rehab equipment
Sonar bathymetry Sediment depth profile, debris volume estimates, scour/void indications below waterline
Condition grading Segment condition rankings aligned to client criteria and rehab priorities
Drawings and maps Plan/plan‑profile sheets, stationing references, inspection tracks
Recommendations Cleaning/maintenance actions, spot repairs, trenchless rehab method fit, bypass needs, traffic/access planning

For how these outputs drive decisions, see Evaluation and Assessment and Maintenance Plans.

Tolerances, acceptance criteria, and reporting precision

  • We report geometry, sediment, and defect metrics at engineer‑specified precision and align acceptance criteria to owner standards and project specifications.

  • Acceptance thresholds for ovality/deflection, minimum clearances, and allowable debris are set by the owner and reflected in our submittals; we document any exceedances explicitly with stationing, imagery, and plots.

  • Post‑rehabilitation verification repeats the same MSI methods when required to confirm acceptance. Pipe Rehabilitation

Integration with trenchless rehabilitation

Our inspection program is purpose‑built to feed trenchless design and constructability:

  • CIPP design inputs: host pipe geometry, ovality, and groundwater/infiltration indicators inform liner selection and design. CIPP services

  • Geopolymer spincast: Laser‑derived geometry defines thickness zones and surface prep requirements. Services

  • Pipe bursting and sliplining: Clearance checks, bend radii, and obstruction mapping de‑risk installation. Pipe Rehabilitation

Large‑diameter capability and service area

  • Diameter coverage: Our inspection and rehabilitation teams routinely support assets from 4 to 108 inches in diameter. CIPP Georgia

  • Rapid mobilization: 24/7 availability with a 15‑minute emergency callback and mobilization within 24 hours across our footprint. CIPP Georgia

  • Regional reach: Headquarters in Florida with a secondary wetout facility in Morganton, NC for fast regional response. CIPP North Carolina

Relevant projects and case studies

Explore outcomes across stormwater, wastewater, and water programs:

Specification and RFP language (copy‑ready)

  • Require multi‑sensor inspection (CCTV + laser + sonar) for pipes ≥36 inches or where flow prevents full visual coverage.

  • Deliver synchronized video, geometry profiles, and sonar bathymetry with stationing at engineer‑specified intervals.

  • Provide condition grading aligned to owner criteria and a prioritized rehabilitation/maintenance plan.

  • Include pre‑inspection cleaning, flow control/bypass design, traffic/access control, and safety plan submittals.

  • Submit QA/QC procedures covering sensor calibration, data synchronization, and independent review.

Next steps