- Exceedance is the average number of flood events that can be expected in a year.
- Exceedance depends on height above sea level and year
- Exceedance of 1 means one flood every year
- Exceedance of 0.1 means one flood every 10 years
- Exceedance of 0.01 means one flood every 100 years
- Exceedance of 0.002 means one flood every 500 years
- Color scale for exceedance
- Elevations that greater than 7 meters sea level are transparent, regardless of year
- Exceedance >= 1 is red
- Exceedance in the range 1-0.1 is pink
- Exceedance < 0.1 is blue
- NOT IMPLEMENTED: Elevations below an exceedance of .002 (500-year flood) should be transparent
- Compare with Figure 2a in Baranes, et al. (2020)
- They use "Storm Tide (m above Annual MSL)"
- The figure below uses meters NAVD88
- Note: axis tick labels use SI symbols ()
- Question: How high does an asset need to be to maintain a given level of protection against flooding over a given time period?
- User input:
- End year
- Desired level of protection at the end year (another way of saying this is flood risk tolerance in the end year).
- Examples: I want my asset to be protected against the flood
[that is expected to occur 10 times per year / that has a 1% chance of occurring / etc] in the end year
- Intermediate or High sea level rise scenario
- Could just show both results, or include text that provides guidance on choosing based on the
criticality of the asset
- Output:
- Could just be an elevation, or it could be a plot of the elevation that maintains the desired
level of protection from the present year (2024) to the user-provided end year
import {tidy} from "./components/exceedance.js";