What is the purpose of as-built drawings in stormwater management?

• A. To provide future expansion plans for the site.
• B. To estimate construction costs.
• C. To document post-construction maintenance schedules.
• D. To document actual installed BMP locations and conditions for ongoing maintenance, inspection, and compliance.

Answer: (D)

As-built drawings document the actual installed stormwater controls and their real locations, dimensions, and conditions after construction. This precise record is essential because it provides the true reference for ongoing maintenance, regular inspections, and regulatory compliance. Knowing exactly where each BMP sits, its elevations, connections, and current state lets maintenance crews locate and service the devices correctly, assess performance, and report accurately to permitting authorities. The drawings reflect any changes made during construction, ensuring the site’s post-construction reality matches permit requirements and design intent for long-term asset management and compliance.

These drawings are not primarily for planning future expansions, estimating costs, or detailing maintenance schedules. Expansion plans come from design or master plans, cost estimates come from procurement or budgeting processes, and maintenance schedules are typically captured in separate documents.