Aquatic Center Case Study: 4 Weeks of Natatorium Schedule Saved

The project: a municipal public aquatic and recreation center

The client is a municipal parks and recreation department. The project was a new public aquatic and recreation center built around a roughly 45,000-square-foot natatorium housing a competition pool and a separate recreation pool, plus support spaces. We have anonymized the agency and exact location at the owner's request; the issue categories and outcomes below are reported as they occurred.

A natatorium is one of the hardest spaces in commercial construction to coordinate. It combines large dehumidification and HVAC equipment with long overhead duct runs, deep structural spans, embedded pool piping, and corrosive, high-humidity conditions - all in a single tall room where every system competes for the same space. When the pool hall is on the critical path, as it usually is, any field clash there delays the whole project.

Finding 1: dehumidification ductwork clashing with the pool structure

The critical finding was a clash between a large dehumidification supply duct and a deep structural girder spanning over the competition pool. The mechanical drawings routed the duct through the same vertical zone the structural drawings reserved for the girder - a conflict invisible on any single sheet but obvious when the disciplines are cross-checked.

Discovered during rough-in over a pool, this is a worst-case clash: there is no easy place to reroute a major duct over open water, and resolving it in the field means stopping work, redesigning the run, and waiting on fabrication. The team valued the avoided delay alone at four weeks. Cross-discipline conflicts like this are precisely what AI review is strongest at - see our MEP coordination best practices.

Finding 2: a pool-wall embed and pipe penetration conflicting with structure

Helonic flagged a pool-wall embed and recirculation-pipe penetration that conflicted with the structural design of the pool shell. Embeds and penetrations in a cast-in-place pool structure are effectively permanent - getting them wrong means coring or rebuilding structural concrete that holds water, one of the most expensive and schedule-damaging field corrections on an aquatic project.

Resolving the embed coordination on paper, before the pool shell was poured, eliminated the risk entirely. This is the same class of conflict our plumbing coordination guide describes, amplified by the fact that it lives inside structural concrete.

Finding 3: a main drain configuration that did not clearly meet VGB

The third finding was a main-drain configuration that did not clearly satisfy the Virginia Graeme Baker (VGB) Pool and Spa Safety Act anti-entrapment requirements as drawn. On a public pool, a VGB deficiency is a life-safety and code-approval problem, not a cosmetic one - catching it before construction kept the project clear of a costly late-stage correction and an approval risk.

The outcome: the pool hall stayed off the critical path

Together the findings represented an estimated four-week avoided slip to the natatorium MEP rough-in - the project's critical path - plus roughly $380,000 in avoided rework. The figures are the owner team's estimates of in-field cost and delay had each issue propagated to construction, rounded for anonymization. For how time and cost compound when these issues reach the field, see our construction rework costs analysis.

How Helonic Helps

Helonic's AI reads the 2D construction documents and cross-checks architectural, structural, and MEP sheets simultaneously - exactly the comparison that surfaces a duct-versus-girder clash over a pool or an embed conflict in a pool wall. On specialized public buildings where the hardest space drives the schedule, finding those conflicts before the pour is what keeps the project on time. See how AI review compares to manual review.

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