Surface depressions and sinkholes forming near storm drain inlets, along pipe routes, or near manhole rings indicate that void formation is occurring underground — caused by water infiltrating through failed pipe joints carrying fine soil particles with it. The void grows with every storm event until the surface can no longer support it.
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Sinkhole formation near storm drains follows a predictable progression — starting with pipe joint failure and ending with surface collapse if the failed joint is not rehabilitated.
Once void formation is confirmed above a failed storm drain joint, the rate of void growth accelerates — each storm event removes more material, and the cost and complexity of remediation increases with void size.
Sinkhole formation near storm drains is most common where pipe joint failure occurs in granular soils — where fine-particle transport is most efficient.
A Charlotte church property had developed a sinkhole approximately 4 feet in diameter near a storm drain inlet in the main parking lot — forming over approximately one storm season. Camera inspection found significant joint separation at two locations in the storm drain run beneath the affected parking lot area.
LiningWorks CIPP-lined the storm drain run through existing manhole and inlet access, sealing both identified joint separation locations. Surface pressure grouting through the parking lot surface filled the void. Post-installation camera confirmed full liner bond at both previously failed joints. No further surface movement has occurred.
“4-foot sinkhole in the parking lot near the storm drain inlet. Camera found two failed joints underneath. LiningWorks lined the pipe through existing access, we grouted the void from the surface, and the parking lot is solid. No excavation, no pavement replacement.”
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Sinkhole formation near storm drains starts with pipe joint failure. Rehabilitating the pipe stops the void growth mechanism — then surface grouting addresses the existing void.
Camera locates the failed joints — CIPP seals them before the void grows larger.
336-477-3218, Mon–Sat 7AM–6PM. Sinkhole size, proximity to drain inlets, timeline of development — describe what you're seeing and we'll assess urgency and schedule the camera assessment.
We scope the storm drain system beneath the sinkhole area, identify all failed joints, and develop a CIPP lining scope that covers all void-generating infiltration sources.
CIPP liner through existing access seals all identified failed joints. Post-installation camera confirms full liner bond. Surface pressure grouting fills the existing void without excavation.
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