In Vermont, the debate over dredging rivers to mitigate flooding continues. While deepening rivers to increase water capacity seems like a logical solution, scientists argue that this approach is fundamentally flawed, as rivers are designed to handle a specific volume of water.
The Science Behind River Capacity
“It appears logical at first glance, but there’s much more complexity involved,” explained Shayne Jaquith, a river scientist at Nature Conservancy Vermont.
Historical practices of dredging, straightening, and reinforcing river channels have exacerbated current flood damage. Jaquith emphasized, “Much of the damage we’re witnessing today stems from these past management practices.”
Risks of Increasing River Capacity
Experts warn that increasing a river’s capacity beyond its natural limits can intensify flooding events and pose risks further downstream. Michele Braun, executive director of Friends of the Winooski River, stated, “The force and weight of excess water erode the riverbanks, causing the river to widen and leaving us in a worse situation than before.”
Strategic Dredging: A Partial Solution
The state, aligning with experts, acknowledges that while dredging can have occasional benefits, it is not a comprehensive solution. Julie Moore, the secretary of the Agency of Natural Resources, noted, “Dredging must be done strategically to avoid destabilizing rivers before the next flood. Failing to consider the entire river system could lead to catastrophic consequences for neighboring properties.”
Importance of a Holistic Approach
Both scientists and state officials advocate for floodplains as a more effective alternative. “The best way to accommodate floodwaters is to set aside and restore areas where water can spread out, rather than deepening the rivers,” Moore added.
Floodplains: A Sustainable Solution
Reconnecting Floodplains to Rivers
For residents affected by severe flooding in recent years, an effective solution is urgently needed. Braun, who experienced severe flooding in Montpelier, remarked, “If I believed dredging would protect my town, I’d support it. But I know it won’t.”
Addressing Development on Floodplains
The state also highlighted that development on floodplains contributes to recurring flooding issues. Efforts are underway statewide to reconnect floodplains to rivers or identify alternative water retention methods to reduce flooding impacts.
By focusing on sustainable practices and strategic planning, Vermont aims to find effective solutions to prevent river flooding and protect communities from future flood events.