The Floodway Encroachment Standard: Minimizing Cumulative Adverse Impacts

Contributor(s):

Material type: Article

ArticlePublisher: Madison Association of State Floodplain Managers 2013Description: ii, 20 pages illustrations, charts Appendix B 27 pagesContent type:

text

Media type:

computer

Carrier type:

online resource

Subject(s):

Online resources:

Access publication here through ASFPM digital library

Contents:

Acknowledgements--Introduction--Background--More Restrictive State and local standards for mapping floodways--Nations Flood Insurance Act of 1968--Impact Assessment--Discussion--Conclusions--References--Appendix A

Summary: Small encroachments into a floodplain in and of themselves may have a negligible impact on flood elevations. However, the combined, incremental effects of human activity, referred to as cumulative impacts, can cause significant increases in flooding. The National Flood Insurance Program attempts to address the cumulative impacts of encroachments into the floodplain through the use of a regulatory floodway. Federal minimum standards allow floodways to be developed based on the concept of allowing some encroachments but limiting the increase in flood elevations caused by these encroachments to one foot.Supplement:

The Floodway Encroachment Standard: Minimizing Cumulative Adverse Impacts Appendix B

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Item type	Current library	Call number	Vol info	Status	Date due	Barcode	Item holds
Online Resources, E-resources	ASFPM Library		The Floodway Encroachment Standard: Minimizing Cumulative Adverse Impacts	Available

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The following members provided helpful comments on initial drafts of this publication:
Larry Larson, Dave Carlton, Ed Thomas, Sivash Beik, Tim Trautman, and Dave Knipe

Includes bibliographic references

Small encroachments into a floodplain in and of themselves may have a negligible impact on flood elevations. However, the combined, incremental effects of human activity, referred to as cumulative impacts, can cause significant increases in flooding. The National Flood Insurance Program attempts to address the cumulative impacts of encroachments into the floodplain through the use of a regulatory floodway. Federal minimum standards allow floodways to be developed based on the concept of allowing some encroachments but limiting the increase in flood elevations caused by these encroachments to one foot.

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