Association of Montana Floodplain Managers
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No Adverse Impact  

NAI is defined as "…an approach that ensures the action of any property owner, public or private, does not adversely impact the property and rights of others." The objective of NAI is the safe and proper development of land subject to a hazard.   To learn more, click here.


Montana's first formal introduction to the No Adverse Impact (NAI) concept took place thanks to the Big Hole Watershed Committee (BHWC).  The BHWC obtained a number of sponsors and was able to bring Mr. Ed Thomas out to Montana for the first No Adverse Impact - Preserving Our Watersheds - Protecting Our Property Rights Conference, Feb 21-22, 2008, at the Fairmont Hot Springs Resort. 

Over 100 participants listened to Mr. Ed Thomas discuss the origins of NAI, how it works in floodplain management, how it’s regarded by the courts, and how it can be applied to assure that the property rights of everyone in the community are respected and protected.  Ed Thomas, with the Michael Baker Corporation of Quincy, Massachusetts, has 35 years of experience as a floodplain manager, disaster specialist, and attorney.



Presentations: 
(large files, may take a while down load)

Publications/tools:
NAI Toolkit (.pdf - 2 MB) 1/04

NAI  ..  The Common Sense Approach