NST recently completed installation of a new Continuous Monitoring and Adaptive Control (CMAC) system at Seven Pines Pond D in Jacksonville.
Seven Pines Pond D is part of the Ryals Creek CDD project and was identified as an existing stormwater facility to be retrofitted with CMAC for water quality improvement. The system is configured to use pre-event drawdown and post-event detention to capture stormwater, increase residence time, and improve nutrient settling.
The project demonstrates a practical use of Florida’s updated stormwater framework. Under Applicant’s Handbook Volume I, Section 9.7.1, overtreatment allows one portion of a development site to provide additional treatment that can compensate for another portion of the same site, provided the combined treatment meets the applicable performance standards.
At Seven Pines, that concept is being applied in a measurable way. The project’s capacity accounting shows Basin D/SMF D providing 1,108.34 pounds per year of TN removal compared to 579.39 pounds per year required, creating 528.95 pounds per year of excess TN treatment capacity. For TP, the system provides 246.46 pounds per year compared to 165.84 pounds per year required, creating 80.62 pounds per year of excess TP treatment capacity.
That excess treatment is intended to support future basins within the project through compensating treatment.
The problem with traditional stormwater design is that each basin is often evaluated as a stand-alone compliance problem. In practice, larger developments need tools that allow treatment to be optimized across the site. CMAC makes that possible by turning an existing pond into an actively managed treatment system.
The result is a better regulatory and engineering outcome: more nutrient removal, better use of existing infrastructure, and a stormwater system that can be operated based on real conditions rather than static assumptions.