Floodplain Mitigation Requirements For Your Build


When you see the water rising, it’s too late to plan for a flood. That’s why it’s important to make sure that a civil engineer is involved in the pre-planning of your property so that permanent flood mitigation strategies can be implemented from the beginning.


Knowing the floodplain mitigation requirements for your project will decrease headaches and delays and prevent costly site re-designs that will increase costs and hold up the permitting of the project. There are different requirements depending on the permitting agencies, but here are some necessary factors that need to be taken into consideration. 


  • Community and/or state floodplain management laws or ordinances, including flood-related standards in building codes, may specify rebuilding procedures. For example, the floodplain management ordinance may restrict flood-damaged buildings from being rebuilt in the floodway.

  • Other community and/or state land-use laws (e.g., zoning ordinances) and building codes may impact rebuilding. 

  • The minimum building elevations requirements for a 100-year versus 500-year floodplain. 

  • The ratio of increased fill versus removed fill. Many entities require a 1:1 ratio but not always. 

  • The ratio for detention requirements. It can typically be much lower than the requirements for mitigation requirements. 


When choosing a civil engineer, ensure that they are very familiar with the requirements when permitting through all agencies pertaining to the site and that you are working closely to provide the required mitigation, but also achieve the site that you anticipated.


PRD Land Development is your go-to for permitting and partnering with municipalities. Reach out to us today at info@prdlanddevelopment.com to learn more.

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