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Georgia Association of Floodplain Management
No Adverse Impact - NAI


According to ASFPM:

"No Adverse Impact Floodplain Management" is a managing principle that is easy to communicate and, from legal and policy perspectives, tough to challenge. In essence, No Adverse Impact floodplain management takes place when the actions of one property owner are not allowed to adversely affect the rights of other property owners. The adverse effects or impacts can be measured in terms of increased flood peaks, increased flood stages, higher flood velocities, increased erosion and sedimentation, or other impacts the community considers important. The No Adverse impact philosophy can shape the default management criteria: a community develops and adopts a comprehensive plan to manage development that identifies acceptable levels of impact, specifies appropriate measures to mitigate those adverse impacts, and establishes a plan for implementation. No Adverse Impact criteria can be extended to entire watersheds as a means to promote the use of regional retention/detention or other stormwater techniques to mitigate damage from increased runoff from urban areas. The No Adverse Impact approach will result in reduced flood damage. However, its true strength is seen when proposed development actions that would affect local flooding or the property rights of others are permitted only when they are in accord with a locally adopted plan that identifies the negative impacts the community wishes to avoid and/or mitigate. The plan could be specific to flood damage or be quite robust, encompassing related objectives such as water quality protection, groundwater recharge, or the management of stormwater, wetlands, and riparian zones. Because it is a local initiative, an NAI-based plan removes the mentality that floodplain management is something imposed by the federal government. Instead, it promotes local accountability for developing and implementing a comprehensive strategy and plan. With the flexibility to adopt comprehensive, locally tailored management plans (which would be recognized by FEMA and other federal programs as the acceptable management approach in that community) the community gains control of its land use decision-making process and is supported in adopting innovative approaches it considers appropriate for its situation. No Adverse Impact management makes sense, and it is the right and legally appropriate thing to do. Too often our discussions on development approaches turn into arguments over the range of application and the effect these approaches may have on those who choose to encroach upon the floodplain. To reduce future costs and inequities, we must change this perspective. We must take a management stance that prevents any development activity from imposing additional flood impacts on other properties and also frees communities to manage flood hazards and development through comprehensive local plans, thus protecting the property rights of the entire community.

Watch the "Mitigation Policy Issues in New Jersey - Following Hurricane Sandy" presentation given by the GAFM NAI Committee and presented by Mr. John A. Miller from from New Jersey Association for Floodplain Management. This presentation was given on August 8, 2013

Watch the "NAI Example-Atlanta Fourth Ward Park Multi-Purpose Neighborhood Stormwater Facility" presentation given by the GAFM NAI Committee and presented by Mr. Kevin Burke from Atlanta BeltLine. This presentation was given on November 11, 2012

Watch the "Climate Change and Emergency Management Adaptation" presentation given by the GAFM NAI Committee and presented by Mr. Ed Thomas, Esq. and the Natural Hazard Mitigation Association (NHMA). This presentation was given on August 8, 2012.

Watch the "The Latest on the NAI and the Law" presentation given by Samantha Medlock, and hosted by Sean Roche, CFM.

NAI Audio Lectures - Download to listen to.
(In order to listen to the audio files you must have a audio player installed, i.e. Windows Media Player, Adobe Shockwave, etc. Here is a link to a free open source audio player VLC)



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