Presentation 2 – Goldilocks and the Three Urban Flood Models: How to size it Just Right!
In collaboration with Jacobs
The summer of 2022 continued the trend of increasing urban flood frequency due to extreme storm events. Urban areas are increasingly impacted by heavy rainfall, even when an open body of water is nowhere in sight. Yet urban flood potential and the interaction of pluvial risk with fluvial and coastal inundation areas is not widely mapped in the United States.
Consequently, urban flood potential is not fully understood by the public and many stakeholders, and populations are left vulnerable to flood exposure.
Increased impervious, deferred maintenance of catch basins, undersized sewer systems, sediment and debris in sewers, and too few catch basins are some of the major contributing factors to urban flooding. Historic practices of filling natural waterways without safe relief pathways have reduced overland flow conveyance opportunities, and historic practices such as redlining have increased the economically disparate impacts of urban flooding on our most vulnerable populations.
Reduced physics modeling approaches, such as the Fathom-US 2.0 dataset, quickly increase our understanding of urban flood potential by providing a first look at inundation risk for a range of extreme events with current and escalated climate conditions. This presentation will include case studies where “starter maps” like Fathom and FEMA have been coupled with historical flood complaint records to focus 1D/2D modeling, planning, and mitigation prioritization efforts to a “just right” modeling approach and extent.