Perhaps by building on stilts or piles or something. Build higher than the base flood elevation?
https://www.seattlepi.com/business/article/What-you-should-know-about-flood-insurance-1297021.php
https://www.massivecert.com/blog/5-ways-lower-your-flood-insurance-premium
https://cityofhoquiam.com/code/Hoquiam11/Hoquiam1116.html#11.16.235
https://www.linkedin.com/pulse/things-consider-before-you-build-floodplain-steven-darmofal
https://www.ci.tumwater.wa.us/home/showpublisheddocument?id=12471



https://www.insurancejournal.com/blogs/right-street/2013/07/17/298846.htm
https://www.amica.com/en/products/flood-insurance/what-is-an-ae-flood-zone.html
Flood plain maps:
https://www.arcgis.com/apps/webappviewer/index.html?id=5c02255903f24190affeebdb9c9927e1
https://www.realtor.com/advice/home-improvement/is-my-property-in-a-flood-zone/