Asset Risk
Overview
Use the tools below to answer two questions about flood risk:
Question #1: Asset Flood Risk -- How likely is an asset to flood over a given time period?
Question #2: Asset Design Height -- What elevation does an asset require in order to achieve a specified level of protection against flooding over a given time period?
We express flood risk as annual flood exceedances, or the number of floods expected to occur per year. Annual exceedances can be less than 1. Some examples:
- 10 annual flood exceedances = expect 10 floods/year
- 1 annual flood exceedance = expect yearly
- 0.1 annual flood exceedances = 10% chance of flooding each year
- 0.01 annual flood exceedances = 1% chance of flooding each year
The tools below specify elevation as height in feet above the NAVD88 vertical datum.
Note: These flood frequency estimates only consider long-term sea level rise and do NOT account for monthly and yearly fluctuations in tides and sea level. For example, although flooding may occur an average of once per month over a 5-year period, there may be months where flooding occurs 5 to 10 times because tides are large and atmospheric conditions are temporarily raising average sea level
Question #1: Asset Flood Risk
Input the following information to determine asset flood risk:
- Height (feet NAVD 88): The elevation of your location or asset in feet above NAVD88. Click your location on the Detailed Flood-Risk Map to get the elevation of the ground. If your asset is mounted above the ground, measure its height above the ground and add that to the ground elevation from the map.
- End year: End of the time period.
- Sea level rise scenario: High or Intermediate
Result:
Question #2: Asset Design Height
Input the following information to determine asset design height:
- End year: End of the time period over which you would like to main a desired level of flood protection
- Maximum tolerable annual flood risk: The maximum annual flood risk you can tolerate for your asset
Result: To maintain flood risk below