This paper presents an inspection-based civil case study of drainage vulnerability during active construction. Using two civil field inspection reports, a coordination log, response emails, and supporting site photographs from a mid-construction residential project in Florida, the study examines how drainage-related deficiencies developed after stormwater infrastructure was already materially installed, how those deficiencies were addressed, and what those events reveal about preserving drainage function before final site stabilization. The record shows a progression from control slippage to direct system vulnerability, including temporary exposure of active drainage elements, sediment intrusion into collection features, uncertainty in an internal manhole control detail, breakdown of work-area sediment containment, and localized loss of drainage effectiveness caused by sediment accumulation. These conditions are interpreted as linked preservation failures within a live drainage network rather than as isolated field defects. The response record further shows that different conditions required different closure pathways, including immediate field protection, correction and reconciliation of a questioned internal detail, and reinforcement of site-scale sediment controls. On that basis, the paper distinguishes between observed deficiency, documented corrective action, and construction-control closure. The study concludes that the principal construction-stage risk lies not in incomplete installation alone, but in loss of protection around drainage assets that have already become operational, and it proposes a practical framework for preserving those assets until the site reaches stable completion. 

drainage preservation, construction stormwater, sediment intrusion, active construction, erosion and sediment control, temporary protection, drainage vulnerability

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