Update Methods.tsx

tsdataclinic · Mar 13, 2024 · faeed2b · faeed2b
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commit faeed2b
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/app/src/components/Methods.tsx b/app/src/components/Methods.tsx
@@ -20,6 +20,14 @@ const MethodsPage = () => {
                     <a href="https://firststreet.org/">First Street Foundation’s</a> <a href="https://aws.amazon.com/marketplace/seller-profile?id=b777a8d0-ad41-4190-b94a-27e18e87e17f">Climate Risk Factor data</a> categorizes census tracts according to the number of buildings at minor, moderate, major, severe, and extreme climate risk. Transit stops inside tracts where no buildings were above minor risk are labeled ‘low’ risk, stops inside tracts with under 15% of buildings above minor risk are labeled  ‘medium’ risk, and stops inside tracts with more than 15% of buildings above minor risk are labeled as ‘high’ risk.
                     Flood and heat risks are bucketed relative to the local <a href="https://en.wikipedia.org/wiki/Metropolitan_statistical_area">Metro Area</a>, and Wildfire risk is bucketed nationally.
                 </p>
+                <p>
+                    <p><b>Floodplains</b></p>
+                    The floodplains we display come from the <a href="https://fema.gov">Federal Emergency Management Agency</a>'s <a href="https://fema.gov/flood-maps/national-flood-hazard-layer">National Flood Hazard Layer</a>. We process a <a href="https://fema.maps.arcgis.com/home/item.html?id=2b245b7f816044d7a779a61a5844be23">simplified version</a> of this data into a national raster file for displaying on TREC.
+
+                    The final raster contains two levels of flood risk: a higher risk 1% (100-year) flood risk category and a lower risk 0.2% (500-year) risk category.
+
+                    Areas outside of these categories are those designated as having minimal flood hazard.
+                </p>
                 <p>
                     <p><b>Hospital Access</b></p>
                     We calculate walk sheds, using walk graphs from <a href="https://www.openstreetmap.org/about">OSM</a> and assumptions on average walking pace, centered on each hospital in the <a href="https://www.usgs.gov/u.s.-board-on-geographic-names/download-gnis-data">GNIS Database</a>. Stops within a 10 minute walk are categorized as high access, those between 10-20 minutes as medium access, and all others as low access.