Abstract

Climate change is projected to lead to larger and more frequent river floods due to declining snowpack and more intense heavy rain events. This means that past events are no longer a reliable indicator of future flood size or frequency. This report describes new streamflow projections for the Snohomish River. The goal of this work is to support more resilient planning by developing an improved assessment of future peak flows.
This study is one part of a larger project to develop improved projections of future peak flows across four major King County rivers (the Snoqualmie / Skykomish, Cedar, Green, and White Rivers). The current report is focused on the results for the Snoqualmie and Skykomish Rivers.