·         A flood study must be performed if the proposed construction activity involves a roadway, driveway and other encroachments crossing through Wake County Flood hazard soils or FEMA floodplain.
·         A flood study may be conducted in order to define the flood boundaries for a stream that is not in a designated FEMA flood hazard area.
·         A flood study or flood soils redelineation may be conducted to show that a building site is not in a flood hazard area.
·         A flood study is an engineering analysis of the impact of the proposed encroachment during the 100 year storm.
·         A flood study must be performed by a Professional Engineer or Professional Land Surveyor and reviewed by Wake County Floodplain Management Staff.
Minor Flood Studies: Development in flood hazard soil locations involving 25 acres or more of drainage area but less than 100 acres of drainage area
Major Flood Studies: Development in flood hazard soil locations involving 100 acres or more of drainage area (requires HEC-RAS)

 FEMA Elevation Certificate
·         The Elevation Certificate is an important administrative tool of the National Flood Insurance Program (NFIP). It is to be used to provide elevation information necessary to ensure compliance with community floodplain management ordinances, to determine the proper insurance premium rate, and to support a request for a Letter of Map Amendment (LOMA) or Letter of Map Revision based on fill (LOMR-F). The Elevation Certificate is required in order to properly rate post-FIRM buildings. The expiration date for this form is March 31, 2012.
·         The document is prepared by a registered land surveyor and used to establish that the house was properly elevated as required by Federal, State or County flood plain management regulations. 
·         The floor elevation listed on the certificate is typically that of the lowest habitable floor elevation of a structure.  The elevation value is in "feet above mean sea level". 
·         The form and instructions can be found at FEMA’s website. FEMA Elevation Certificate

Submittal Requirements:

A Flood Study submittal consists of three sets of plans and one set of calculations.
The fee for each minor flood study (drainage area less than 100 acres) is $500. The fee for each major flood study (drainage areas of 100 acres or more), including No Rise Certifications and CLOMRs, is $1,000. A submittal checklist is available on the website under Stormwater Management/Forms and Documents.
All submittals are directed to:
Stormwater & Floodplain Management Program
336 Fayetteville St.
P.O. Box 550
Raleigh, NC 27602 
Rules and Regs Forms Contacts Fees Single Lot Floodplain FAQs