Developing In A Floodplain

What Types of Development Are Most Often Affected by Floodplain Regulations?
Here is a quick list of structure-related floodplain development regulations that are most likely to affect you:

New primary structures
Dwellings
Accessory structures
Additions to, or replacement of, existing dwellings or other primary structures
Electrical, mechanical, heating, ventilation, plumbing and comparable equipment
Crawlspaces

Remember:  A floodplain development permit is required for all development in the floodplain, even if the work does not require a regular building permit or land use approval.

Planning a Project in the Floodplain?
Remember to get a Floodplain Development Permit before you begin your project.  A Floodplain Development Permit is required for all development in the floodplain – even if the work does not require a regular building permit or land use approval.  All new development within the floodplain must comply with current floodplain development standards, which may include elevating a structure or the utilities serving the structure to the City of Phoenix design flood elevation.  New construction and additions to existing structures require that a licensed surveyor complete three elevation certificates:

Pre-construction elevation certificate for the building site to verify flood elevation and existing ground elevation. 

This certificate is submitted with the application for a permit.
Note:  Prior to applying for a permit it is helpful to submit this certificate to the Floodplain Manager and discuss the proposed project.

During-construction elevation certificate to verify floor elevation.

For site-built dwellings and accessory structures, this certificate is submitted after placement of the lowest floor and prior to vertical wall construction.  Approval of the certificate is required prior to approval of the underfloor inspection.

For manufactured dwellings, this certificate is submitted after the dwelling has been placed on the property. Approval of the certificate is required prior to approval of the set-up inspection.

Final-construction elevation certificate for the completed structure. This certificate is prepared after all of the utilities have been placed and all finished grading is completed.
The certificate must be submitted and approved prior to final inspection approval for the structure.
Other permits may require submission of an elevation certificate completed by an Oregon-licensed surveyor as well.

A Floodplain Development Permit is also required for all work to repair a structure that has been damaged by any type of event.