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Estimates of Present and Future Flood Risk in the Conterminous United States

TLDR
The authors used a 30 m resolution model of the entire conterminous US with a 2D representation of flood physics to produce estimates of flood hazard, which match to within 90% accuracy the skill of local models built with detailed data.
Abstract
Past attempts to estimate rainfall-driven flood risk across the US either have incomplete coverage, coarse resolution or use overly simplified models of the flooding process. In this paper, we use a new 30 m resolution model of the entire conterminous US with a 2D representation of flood physics to produce estimates of flood hazard, which match to within 90% accuracy the skill of local models built with detailed data. These flood depths are combined with exposure datasets of commensurate resolution to calculate current and future flood risk. Our data show that the total US population exposed to serious flooding is 2.6–3.1 times higher than previous estimates, and that nearly 41 million Americans live within the 1% annual exceedance probability floodplain (compared to only 13 million when calculated using FEMA flood maps). We find that population and GDP growth alone are expected to lead to significant future increases in exposure, and this change may be exacerbated in the future by climate change.

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Citations
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Effective adaptation to rising flood risk

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A review of remote sensing applications for water security: Quantity, quality, and extremes

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References
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Journal ArticleDOI

Global flood risk under climate change

TL;DR: This article used several climate models to estimate the global risk of flooding at the end of the century and showed that vulnerability is dependent on the degree of warming and the interannual variability in precipitation.
Book

Handbook of applied hydrology

Ven Te Chow
TL;DR: The Handbook of Applied Hydrology as mentioned in this paper has been used extensively in the field of applied hydrology, including in the application of water aeronautomatics and water aerodynamics.
Journal ArticleDOI

Future coastal population growth and exposure to sea-level rise and coastal flooding--a global assessment.

TL;DR: This work combines spatially explicit estimates of the baseline population with demographic data in order to derive scenario-driven projections of coastal population development and highlights countries and regions with a high degree of exposure to coastal flooding and help identifying regions where policies and adaptive planning for building resilient coastal communities are not only desirable but essential.
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