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.