Session A8- Flood frequency estimates for New England fish passage projects: Considering climate change in project design

TL;DRAbstract

Flood frequency estimates are used to quantify the magnitude and frequency of relatively rare river discharges. Such estimates are necessary to design many fish passage projects. For projects that include constructing new infrastructure, or retrofitting existing infrastructure, flood frequency estimates are required to size the infrastructure to withstand floods of specified magnitudes (e.g., events expected to recur every 100 years). For projects where infrastructure is being removed and a natural channel restored, for example a dam removal, flood frequency estimates are also useful because stream channel geometry, process, and habitat are very closely linked with the magnitude of comparatively frequent flood events those with recurrence intervals between 1 and 5 years. Recent research documents increases in the magnitudes and frequencies of precipitation and flood events in New England over the last century, especially in recent decades, indicating a hydroclimatic shift. Flood record

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