Rosewood Subdivision Dam

The Rosewood Subdivision Dam is classified as a High Hazard structure under North Carolina Dam Safety regulations, reflecting the potential downstream consequences if the dam were to fail. Homes, roads, and utilities in the subdivision sit within the inundation zone, and the presence of another dam directly downstream creates a cascading failure scenario that adds complexity to the emergency planning requirements.

North Carolina requires annual EAP updates for dams in this classification to ensure that emergency contacts, notification procedures, and hazard assessments stay current. The HOA needed a technically accurate, regulator-ready document that met NCDEQ formatting standards, reflected current downstream conditions, and clearly addressed the cascading failure scenario, all without placing an undue administrative burden on volunteer HOA leadership.

For each annual cycle, RiskHydro completes a thorough desktop review of the prior EAP and supporting documentation before beginning the update. That review has confirmed in both 2025 and 2026 that the existing inundation mapping and failure analysis remained valid, allowing the update to focus on the procedural and contact elements without requiring new hydraulic modeling. Key tasks included:

• Reviewing and verifying the existing inundation mapping and failure analysis to confirm no new modeling was needed for the current update cycle
• Revising and verifying emergency contact lists for NCDEQ Dam Safety, Wake County Emergency Management, local first responders, and HOA leadership
• Refining notification procedures to align with current best practices in dam safety communications and reduce ambiguity during an emergency
• Ensuring the document clearly and accurately described downstream cascading failure conditions in a format understandable to both regulators and non-technical readers
• Updating emergency access and routing guidance to reflect current conditions and potential inundation extents from dam failure
• Verifying all content met current NCDEQ formatting and submittal standards before submission
• Coordinating with Wake County Emergency Management to confirm communication protocols and response coordination were accurate and current

Both the 2025 and 2026 EAP updates were approved by NCDEQ Dam Safety on the first submittal, no revision cycles required in either year. The HOA now has a current, regulator-ready document that emergency responders can follow during an actual incident, backed by a proven annual process that HOA leadership can rely on year after year without starting from scratch.

• NCDEQ-approved on first submittal for two consecutive years (2025 and 2026), eliminating revision cycles and keeping the HOA in continuous good standing with the state
• Cascading failure conditions clearly documented in a format that satisfies regulator expectations and is accessible to non-technical stakeholders
• Verified inundation mapping and failure analysis confirmed valid without new modeling, keeping costs and timelines predictable
• Updated emergency contacts and notification procedures that give responders accurate, actionable information when it matters most
• Improved emergency access guidance reflecting current conditions and dam failure inundation extents
• Minimal administrative burden on HOA leadership, with a document structured for straightforward annual maintenance going forward
• Proven, repeatable annual process now demonstrated across two consecutive update cycles, giving the HOA confidence in continued regulatory compliance