Goodman et al. (2026) Modeling cumulative hydrologic effects of multiple floodplain restoration projects in a 4th-order river channel network

Identification

• Journal: Journal of Hydrology
• Year: 2026
• Date: 2026-03-06
• Authors: Lucas M. Goodman, Dow Scott, Erich T. Hester
• DOI: 10.1016/j.jhydrol.2026.135242

Research Groups

• Biological Systems Engineering, Virginia Tech, VA, USA
• Civil and Environmental Engineering, Virginia Tech, VA, USA

Short Summary

This study used HEC-RAS to evaluate the cumulative hydrologic effects of floodplain restoration projects on flood propagation in a generic 4th-order river channel network. It found that flood attenuation generally increased with restored channel length, but project location and existing restoration significantly influenced benefits, sometimes even exacerbating flooding due to peak flow synchronization.

Objective

• To evaluate how the extent and location of floodplain restoration influence flood propagation and attenuation in a generic 4th-order channel network.

Study Configuration

• Spatial Scale: Generic 4th-order channel network, parameterized using average conditions from the Chesapeake Bay watershed.
• Temporal Scale: Flood event duration, focusing on flood propagation and attenuation.

Methodology and Data

• Models used: HEC-RAS (Hydrologic Engineering Center's River Analysis System)
• Data sources: Average hydrologic and geomorphic parameters derived from the Chesapeake Bay watershed.

Main Results

• Flood attenuation and floodplain exchange generally increased with the length of restored channel.
• The benefits of individual restoration projects were significantly influenced by their location within the network and the amount of restoration already present.
• Coordinated watershed-scale efforts, particularly in lower-order channels, can yield substantial benefits both locally and downstream.
• While restoration typically provides flood attenuation, it can unintentionally exacerbate flooding in some cases due to peak flow synchronization.
• The study introduced "planning curves" to relate project placement and extent to watershed-scale outcomes.

Contributions

• Addresses the gap in understanding cumulative hydrologic effects of floodplain restoration at the watershed or channel network scale.
• Introduces novel "planning curves" to guide restoration project placement and extent for watershed-scale outcomes.
• Highlights the critical importance of using channel network models for informing permitting and planning of restoration projects to avoid unintended negative consequences like peak flow synchronization.

Funding

• Not specified in the provided text.

Citation

@article{Goodman2026Modeling,
  author = {Goodman, Lucas M. and Scott, Dow and Hester, Erich T.},
  title = {Modeling cumulative hydrologic effects of multiple floodplain restoration projects in a 4th-order river channel network},
  journal = {Journal of Hydrology},
  year = {2026},
  doi = {10.1016/j.jhydrol.2026.135242},
  url = {https://doi.org/10.1016/j.jhydrol.2026.135242}
}