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→Flood causes: Reword 100-year flood paragraph to be more scientifically accurate |
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Human activities, such as upstream logging in the Chehalis River basin, have caused floods to become more severe. [[Clearcutting|Clearcut logging]] has resulted in numerous landslides containing logs, mud, and silt that lead to congested areas, [[log jam]]s, and large amounts of debris in the aftermath. An increase in floodplain development, and the use of [[Fill dirt|fill]], as also been cited as a major cause to the augmented intensity of floods in the late-20th and early-21st centuries.<ref name="MFIWW"/><ref name="DDLST"/>
The risk of flooding at a level that used to constitute a [[100-year flood]], meaning there was a 1% chance of it occurring in any year, had increased by 33% between the 1980s and 2010s.<ref name="SWTMF">{{cite press release |title=State works to mitigate flood damage, restore fish habitats in Chehalis River basin |url=https://medium.com/wagovernor/state-works-to-mitigate-flood-damage-restore-fish-habitats-in-chehalis-river-basin-bfad22bf0f |access-date=June 19, 2024 |work=Medium |publisher=Washington State governor's Office |date=June 2, 2017}}</ref>
==Native American flood history==
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