By WILLIAM PRECHT
The U.S. Army Corps of Engineers and environmental regulators are being squeezed between two powerful public interests – a modern port capable of serving a changing global shipping fleet and a coral ecosystem already pushed to its brink by development and climate change. That framing is real, but the loudest versions of the debate are not always the most useful.
Port Everglades should not be expanded because economic growth is treated as automatically virtuous. Nor should dredging be rejected because every sediment plume is portrayed as an ecological apocalypse. The decision should turn on measurable risks, realistic benefits, enforceable safeguards and monitoring designed to distinguish project effects from the many other forces acting on southeast Florida’s coastal ecosystems simultaneously.
The economic case deserves to be taken seriously. Port Everglades is a major cargo, cruise and fuel gateway. Larger vessels increasingly dominate international shipping and channels that constrain their draft can require tighter loads, tidal scheduling, or diversion to competing ports. Deepening and widening the channel should improve navigation, increase safety, reduce bottlenecks, reduce the risk of a major ship grounding, strengthen regional supply chains and increase jobs and revenue tied to maritime commerce.
The environmental case is equally serious. The coral communities near Port Everglades contain living coral communities in a region where coral cover has already been reduced by disease, marine heat waves, bleaching, water-quality degradation and decades of cumulative disturbance. Dredging can add another stressor through suspended sediment, burial and reduced light. The localized occurrence of protected species also needs to be considered. Even localized losses matter when surviving colonies are scarce and recovery is slow. The relevant question is therefore not whether dredging can harm corals — it can — but how much harm is likely, where it will occur, which species and habitats are most vulnerable and whether those impacts can be avoided, minimized, or credibly managed and mitigated.
Those are not slogans, rather; they are legitimate public benefits. But they must be quantified. Decisionmakers should demand transparent projections of vessel traffic, avoided delays, safety gains, construction costs, long-term maintenance and who ultimately receives the economic benefits. This review was completed for PortMiami in 2014-2015, which resulted in exceeded projections and expectations.
It also unfolded during an extraordinary period of coral mortality driven by stony coral tissue loss disease and other regional disturbances. Some later claims assigned broad coral losses to dredging largely because the losses occurred between pre- and post-construction surveys. That is not enough and it’s not a science-based result. Timing alone does not establish cause. At the same time, uncertainty about large regional stressors cannot be used to dismiss clearly documented, near-field dredging impacts. Sound policy decisions can be made by understanding that both dredge-related and natural impacts can and do occur at the same time. Also, there are lessons learned from the PortMiami project that show what failed, where it failed and why. Using these to improve best management practices on Port Everglades will undoubtedly improve outcomes.
The first lesson is that baseline science cannot be an afterthought. Before construction begins, agencies need multiple years of site-specific data on coral condition, recruitment, disease, sediment composition, natural sedimentation, currents, waves, storms, turbidity and seasonal variability. Turbidity is not the same as sediment deposition and is not, by itself, proof that millions of corals are being buried, especially at sites far from the dredging operations. Turbidity measurements should be calibrated to total suspended sediment, sediment trap data should be paired with hydrodynamic observations and monitoring sites should be positioned to detect effects both along and across expected plume pathways. Without that foundation, later arguments become exercises in competing inference.
The second lesson is that monitoring must be designed to answer causal questions while operations are underway. Repeated observations of permanently tagged corals are more informative about cause of death than widely separated snapshots of coral abundance. Monitoring should document sediment accumulation, partial tissue loss, bleaching, disease signs, burial and recovery with date-stamped photographs and standardized in situ protocols. Those biological records should be linked to dredge location, operating method, scow loading, overflow, currents, waves, temperature, rainfall and ocean chemistry. Independent scientific review should be built into the program and raw data should be released promptly so that conclusions can be tested rather than merely announced. Real-time underwater video and aerial drone imagery should also be integrated into monitoring programs.
The third lesson is to regulate the mechanisms that create risk, not the terminology that attracts clickbait headlines. The PortMiami review indicates that overflow of fine material during scow loading and transport was a major source of turbid plumes. If Port Everglades proceeds, managers should restrict overflow, minimize leakage, slow production rates if necessary and limit certain operations during unfavorable sea states. They should also require rapid (real-time) operational changes including temporary “stop work orders” when biological and physical thresholds are exceeded. While blanket bans on a dredging technique like “rock-chopping” may sound decisive, they may be grounded in wrong or incomplete assumptions that can eliminate a methodology that, under some conditions, reduces project impacts, thereby limiting options to the dredging contractor. Ultimately, performance standards should govern results, while adaptive management should determine how to achieve them.
The current pause in the federal and state permitting process should be used as a scientific reset, not claimed prematurely as victory or dismissed as a technical inconvenience. If the project scope, construction sequence, or mitigation plan is being reconsidered, the revised proposal should be compared openly with feasible alternatives: a different footprint, different channel geometry, phased construction, seasonal restrictions and modified disposal and scow practices. Each alternative should be evaluated against the same ecological, navigational, economic and engineering criteria. A preferred plan should emerge from that cost-benefit comparison — not from institutional momentum, litigation strategy, or public-relations pressure.
Both sides should retire their favorite shortcuts. Port advocates should stop implying that any delay is anti-business or that mitigation can make every impact disappear. Project opponents should avoid converting population estimates into likely coral deaths or treating all remotely observed plumes as proof of widespread burial.
The media also bear a responsibility to report on this issue with rigor, fairness and accountability. Journalists should serve as honest brokers — not as opponents or proponents of the project—by scrutinizing claims from all sides, distinguishing evidence from advocacy, disclosing uncertainty and correcting errors promptly.
Port Everglades presents an important yet difficult decision because both the economic asset and the ecological asset are real. A responsible outcome may be a redesigned project with a slightly different footprint and stronger environmental controls. It may be a phased project that proceeds only after its first stage meets predefined environmental benchmarks. Or the evidence may show that expected damage to coral resources exceeds what was anticipated requiring significant additional controls and restrictions. Science does not guarantee one predetermined answer.
William F. Precht is Director, Coastal and Marine Programs for Bio-Tech Consulting
