(A) When development in the floodplain will cause or causes a change in the base flood elevation, the applicant, including state agencies, must notify FEMA by applying for a conditional letter of map revision and then a letter of map revision.
(B) Example cases include: any development that causes a rise in the base flood elevations within the floodway; any development occurring in Zones A1-30 and AE (as defined on the FIRM) without a designated floodway, which will cause a rise of more than one foot in the base flood elevation; and/or alteration or relocation of a stream (including, but not limited to, installing culverts and bridges) 44 C.F.R. §§ 65.3 and 65.6(a)(12).
(1998 Code, § 26-57)