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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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A Protocol for Conducting Rainfall Simulation to Study Soil Runoff
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Projecting changes in extreme rainfall from three tropical cyclones using the design-rainfall approach.

Anna M Jalowska1, Tanya L Spero1, Jared H Bowden2

  • 1Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, USA.

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Summary

Eastern North Carolina faces increasing tropical cyclone rainfall intensity. Future projections show significant increases, with some events already matching current extreme rainfall realities.

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Area of Science:

  • Climatology
  • Extreme Weather Events
  • Tropical Cyclones

Background:

  • Eastern North Carolina (ENC) has experienced severe tropical cyclones causing extensive flooding and damage over the last 25 years.
  • Historical climate data indicate a rising trend in extreme rainfall event frequency and intensity across the eastern U.S., a trend expected to persist.
  • These changes pose significant risks to coastal regions like ENC.

Purpose of the Study:

  • To explore and quantify potential changes in extreme rainfall associated with tropical cyclones in ENC from 2025 to 2100.
  • To assess the projected impact of climate change on rainfall intensity and frequency for future tropical cyclone events in the region.

Main Methods:

  • Utilized dynamically downscaled climate projections to analyze changes in extreme rainfall frequencies (return periods).
  • Focused on three specific tropical cyclone scenarios to model future rainfall patterns.
  • Employed an approach based on relative changes in future extreme rainfall frequencies.

Main Results:

  • Projected local maximum rainfall intensities could increase by up to 168% by 2100.
  • Widespread regional increases in total rainfall are projected to reach up to 44%.
  • The projected intensity of future events is comparable to the most extreme rainfall events observed in the U.S. in the early 21st century.

Conclusions:

  • Future tropical cyclones in ENC may bring significantly more intense rainfall than previously projected.
  • The study suggests that the extreme rainfall intensities predicted for the future may already be occurring.
  • These findings highlight the urgent need for adaptation strategies to address escalating flood risks in ENC.