House A is located on the highest area on its lot, about a foot higher than the rest of the land. Imagine two similar homes located next to each other. If water is coming from a nearby lake, river, or bay, a home closer to that water source may be more likely to flood, or more likely to experience a deeper flood. Common reasons for differences in flood risks Proximity to water As a result, even seemingly-minor differences between similar homes can lead to differences in flood risks and Flood Factors. If building information is unavailable, like for vacant lots, flood risks are analyzed against the center of the property. Flood risks vary for a wide variety of reasonsĪ property’s Flood Factor is determined by the likelihood of floodwater reaching the largest building on a property. In contrast, a property that has a 47% chance of at least 1 inch of floodwater reaching the home will have a major Flood Factor of 6. Properties with at least a 99% chance of flooding over 30 years will have a Flood Factor of 6 or higherįor example, a property that has a 12% chance of at least 1 inch of floodwater reaching the home will have a moderate Flood Factor of 4.Properties with at least an 80% chance of flooding over 30 years will have a Flood Factor of 5 or higher.Properties with at least a 26% chance of flooding over 30 years have a Flood Factor of 4 or higher.Properties with at least a 6% chance of flooding over 30 years will have a Flood Factor of 2 or higher.Below are general Flood Factor thresholds based on the likelihood of flooding and scores increase from these thresholds based on the depth of flood water so if two homes have similar likelihoods of say 26%, one could have a higher score if it’s more at risk for higher depths of flooding. These boundaries produce a set of rules that can be used to understand why one property may have a Flood Factor of 4 while another has a Flood Factor of 7. The specific depth and likelihood of flooding expected to reach a property are used to determine the boundaries for each level of flood risk. Buildings in contact with deeper floods, or those with higher probabilities of flooding, will have higher Flood Factors. Properties with minimal Flood Factors shouldn’t show any flood water reaching the building outline in any flood scenario. If you zoom in close enough, you can see both buildings' outlines as well as different flood scenarios. If you’re not sure why your home’s Flood Factor ® differs from your neighbor’s, one way to understand differences in risks is to switch to the map view on the flood risk explorer. Ranks vary because of differences in flood risks Nextdoor neighbors can have significant differences in flood risks, due to differences in elevation, proximity to water, wetlands, or flood risk reduction projects. Learn about why nearby homes can have different flood risks.
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