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Hinterland Group Inc. Updated August 04, 2026

Large‑Diameter Stormwater/Culvert Rehabilitation Without Excavation (36–108+ in)

Large‑Diameter Stormwater/Culvert Rehabilitation Without Excavation (36–108+ in)

Introduction

Large‑diameter stormwater and culvert assets (36–108+ inches) can be renewed in place without open‑cut disruption. Hinterland Group delivers trenchless solutions across Florida and the Southeastern U.S., integrating condition assessment, design, installation, and QA/QC through our in‑house PRIME model: Pipeline Rehabilitation, Repair/Replacement, Inspection, Maintenance, and Evaluation/Assessment. See our Services, Pipe Rehabilitation, Inspection, Maintenance, and Evaluation and Assessment pages.

When trenchless is preferred for 36–108+ in assets

  • Live traffic or airfield operations where open‑cut MOT or runway/taxiway closures are impractical.

  • Environmentally sensitive corridors (wetlands, canals, coastal zones) where excavation risks are high.

  • Deep cover, high groundwater, or tidal influence driving up dewatering costs.

  • Corrosion, joint separation, soil loss/infiltration, ovality, invert loss, or capacity restoration needs.

  • Schedule‑critical work windows (night, off‑peak, seasonal) and emergency failures requiring rapid mobilization. For emergency capabilities, see Emergency Storm & Flood Response.

Methods we deliver without excavation

Hinterland performs all trenchless methods in‑house, enabling objective method selection and single‑source accountability. Core options for large‑diameter stormwater/culverts include CIPP and spray‑applied geopolymer (SAPL), with sliplining available when diameter tradeoffs are acceptable. See Pipe Rehabilitation.

Cured‑In‑Place Pipe (CIPP) for large diameters

  • Application: Round storm sewers and culverts; feasibility‑based use on select non‑round profiles with custom wet‑out and forming strategies.

  • What it solves: Structural renewal, infiltration/exfiltration, joint defects, corrosion, and minor ovality; restores a continuous, jointless host.

  • Installation: Clean/inspect, bypass as needed, invert protection, liner inversion or pull‑in, controlled cure, reinstatements, post‑CCTV.

  • Range and readiness: Hinterland routinely lines from 4 in. up to 108 in. using advanced materials, including EcoLiner, across the Southeast. See CIPP Florida, CIPP Georgia, and CIPP North Carolina.

Spray‑Applied Geopolymer (SAPL) for structural build‑back

  • Application: Non‑round/arch/box/elliptical culverts and stormwater structures (CMP, RCP, brick, masonry, or deteriorated concrete) where conformal shaping and structural build‑back are required.

  • What it solves: Advanced corrosion, missing invert, shape loss, chemical attack, and infiltration; creates a monolithic, corrosion‑resistant liner.

  • Installation: Surface prep, profiling, defect stabilization, engineered thickness design, automated/spincast placement, rapid set, QA thickness verification.

  • Benefits: Conforms to complex geometries; rapid return to service; compatible with live‑load scenarios after engineering verification. See Services.

Sliplining (when hydraulics allow)

  • Application: Severely deformed hosts or where upsizing is unnecessary; installs a new carrier with annular grouting.

  • Considerations: Reduces internal diameter; requires engineering of end treatments and flow transitions. See Pipe Rehabilitation.

Method at‑a‑glance

Method Compatible shapes Typical large‑diameter use Hydraulic impact Return‑to‑service profile Best for
CIPP Round; select non‑round with feasibility review 36–108+ in storm sewers/culverts Minimal; smooth wall may improve flow Cure‑dependent; coordinated with bypass plans Jointless structural renewal, infiltration elimination
Geopolymer (SAPL) Round, arch, box, elliptical, irregular 36–108+ in culverts and structures Minimal; shape conforms to host Rapid set; staged segments feasible Corrosion/voids, invert rebuild, complex geometries
Sliplining Round (primarily) Large hosts with major deformation Moderate; diameter tradeoff Fast after prep; grouting time needed Host beyond shape tolerance where diameter loss is acceptable

Non‑round, arch, box, and elliptical geometries

  • SAPL is often first‑line for arches, boxes, and irregular profiles because it conforms to existing geometry while providing engineered structural thickness.

  • CIPP can be viable for some non‑rounds with project‑specific design, forming, and curing controls; feasibility is determined after CCTV inspection and engineering review.

  • Hydraulics: Both CIPP and SAPL produce smooth, low‑roughness surfaces that can offset minor diameter changes; verify Manning’s n and head conditions in design.

MOT and airport operational constraints

  • Roadway MOT: Night work, lane shifts/closures, detours, and expedited cure windows coordinated to maintain peak traffic; trenchless avoids long‑duration open cuts. Hinterland designs MOT around cleaning, bypass, lining, and QA steps to compress work windows. See Markets We Serve.

  • Airfields: Work sequencing to meet runway/taxiway outage windows, movement‑area escorts, FOD controls, and security/badging requirements. Our teams deliver trenchless renewal under strict operational and safety protocols. See Airports.

Florida case notes (selected)

  • Manatee County: Structural rehabilitation of a critical 66‑inch stormwater line with minimal community disruption, demonstrating large‑diameter method execution and flow restoration. Referenced in company case materials; see broader Case Studies.

  • West Palm Beach emergency: Rapid manufacture and installation of a 108‑inch by 44 mm liner under urgent flood conditions, enabled by vertical integration with Global Materials and immediate mobilization. See emergency capabilities at Emergency Storm & Flood Response.

  • City of West Palm Beach (31st–35th St.): $4M neighborhood improvements with coordinated water, sewer, drainage, pavement, and streetscape restoration; illustrates multi‑system delivery in urban corridors. See related Nottingham Blvd & Miller Ave project.

QA/QC and deliverables for large‑diameter lining

  • Pre‑construction: Cleaning, heavy‑debris removal, survey, CCTV with condition coding, bypass/MOT plan, engineering submittals and liner design calcs.

  • During installation: Environmental controls, liner wet‑out documentation, temperature/thickness logs, cure records, batch/lot traceability.

  • Post‑construction: Final CCTV, thickness verification (spot checks/cores where specified), punch‑list completion, as‑builts, O&M guidance, and warranty package.

Why Hinterland for 36–108+ in work

  • All core trenchless technologies performed in‑house for unbiased method selection and single‑source accountability. See Pipe Rehabilitation.

  • Rapid emergency response (24/7) with guaranteed callback and mobilization capabilities across the Southeast. See Emergency Storm & Flood Response.

  • Safety excellence: Full‑time Safety Manager (OSHA‑certified) and consistently low EMR, reinforcing predictable delivery. See About.

  • Geographic reach: HQ in Riviera Beach, FL with strategic wet‑out capacity including Morganton, NC for rapid deployment. See CIPP North Carolina.

Procurement and next steps

  • Engage our assessment team for a feasibility review of CIPP vs. SAPL vs. sliplining based on shape, loads, hydraulics, and access. Start with Evaluation and Assessment.

  • Request a field walk‑through, MOT/airport work plan, and schedule proposal. Contact us at Contact Us or review comparable work in our Case Studies.