PA Aquatic Resource Restoration Conference 2026: Past, Present and Future

This presentation compares project construction and long-term maintenance costs for two widely used stream restoration approaches: (1) floodplain reconnection designs and (2) natural stream channel design (NSCD) approaches. Using a dataset of recent RES projects across multiple states, the analysis evaluates commonly held assumptions regarding the relative cost of these methods, assumptions that are often repeated in the industry but rarely supported by empirical data. The results are intended to provide a more objective, evidence-based foundation for discussing cost expectations, design selection, and long-term performance considerations. Initial findings indicate that construction costs for the two approaches are generally comparable, challenging the common assumption that floodplain reconnection is inherently more expensive. Maintenance costs, however, exhibit greater variability, but a tendency toward lower cost for floodplain reconnection. The presentation explores how factors such as regional construction pricing, footprint of grading, post-restoration growing conditions, and design complexity influence cost differences. Outliers, both high and low, are examined to distinguish methodological anomalies from meaningful cost drivers. The session will also discuss the implications of limited datasets, the statistical results, the value of median-based comparisons, and the lessons from rural versus urban project contrasts. Finally, the presentation addresses conditions under which RES selects floodplain reconnection, highlighting system resilience, ecological lift, and long-term performance considerations. This cost comparison is intended to support practitioners and regulators in developing realistic planning-level cost expectations and identifying key drivers of variability in project budgets.