Traditional detention design relies on passive outlet structures and conservative hydrologic assumptions that often result in oversized basins and costly excavation, particularly on bedrock-dominated, contaminated or footprint-limited sites. A case study from the Smith Farm subdivision in Hoover, Alabama illustrates an alternative approach. The 44-lot development was underlain by shallow rock and required more than 125,000 cubic feet of detention storage, making conventional passive outlet design difficult and expensive. Flood-Con implemented a digitally controlled Automated Outlet Structure to actively manage release rates and optimize storage utilization in real time. The AOS reduced required volume by 35%, cut excavation in half and generated more than $250,000 in construction savings. Post-construction monitoring, including a recorded 25-year, 24-hour storm, validated predicted performance. The presentation uses this case study to explore how active controls, sensor networks and digital twins can modernize stormwater detention design, particularly for constrained sites where conventional approaches are increasingly difficult to justify.