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Using Risk-Based Analysis and Geographic Information Systems to Assess Flooding Problems in an Urban Watershed in Rhode Island

Author

Listed:
  • Kent Hardmeyer

    (Natural Resources Conservation Service, United States Department of Agriculture)

  • Michael A. Spencer

    (Minnesota State University-Mankato, Department of Economics)

Abstract

This article provides an overview of the use of risk-based analysis (RBA) in flood damage assessment, and it illustrates the use of Geographic Information Systems (GIS) in identifying flood-prone areas, which can aid in flood-mitigation planning assistance. We use RBA to calculate expected annual flood damages in an urban watershed in the state of Rhode Island, USA. The method accounts for the uncertainty in the three primary relationships used in computing flood damage: (1) the probability that a given flood will produce a given amount of floodwater, (2) the probability that a given amount of floodwater will reach a certain stage or height, and (3) the probability that a certain stage of floodwater will produce a given amount of damage. A greater than 50% increase in expected annual flood damage is estimated for the future if previous development patterns continue and flood-mitigation measures are not taken. GIS is then used to create a map that shows where and how often floods might occur in the future, which can help (1) identify priority areas for flood-mitigation planning assistance and (2) disseminate information to public officials and other decision-makers.

Suggested Citation

  • Kent Hardmeyer & Michael A. Spencer, 2007. "Using Risk-Based Analysis and Geographic Information Systems to Assess Flooding Problems in an Urban Watershed in Rhode Island," Environmental Management, Springer, vol. 39(4), pages 563-574, April.
    • Handle: RePEc:spr:envman:v:39:y:2007:i:4:d:10.1007_s00267-005-0149-7
    DOI: 10.1007/s00267-005-0149-7
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