15.68.150 New regulatory data.
A. All requests to revise or change the flood hazard data, including requests for a letter of map revision and a conditional letter of map revision shall be reviewed by the floodplain administrator or designee.
1. The floodplain administrator or designee shall not sign the community acknowledgment form for any requests based on filling or other development, unless the applicant for the letter documents that such filling or development is in compliance with this chapter.
2. The floodplain administrator or designee shall not approve a request to revise or change a floodway delineation until FEMA has issued a conditional letter of map revision that approves the change.
B. If an applicant disagrees with the regulatory data prescribed by this chapter, he/she may submit a detailed technical study needed to replace existing data with better data in accordance with FEMA mapping guidelines or Regional Guidance for Hydrologic and Hydraulic Studies in Support of the Model Ordinance for Floodplain Management under the National Flood Insurance Program and the Endangered Species Act, FEMA, Region X, 2010. If the data in question are shown on the published FIRM, the submittal must also include a request to FEMA for a conditional letter of map revision.
C. Where base flood elevation data are not available in accordance with ACC 15.68.130, applicants for approval of new subdivisions and other proposed developments (including proposals for manufactured home parks) greater than 50 lots or five acres, whichever is the lesser, shall include such data with their permit applications.
D. Where channel migration zone data are not available in accordance with ACC 15.68.140(D), the permit applicant shall either:
1. Designate the entire SFHA as the channel migration zone; or
2. Identify the channel migration area in accordance with Regional Guidance for Hydrologic and Hydraulic Studies in Support of the Model Ordinance for Floodplain Management under the National Flood Insurance Program and the Endangered Species Act, FEMA, Region X, 2010.
E. All new hydrologic and hydraulic flood studies conducted pursuant to this section shall be in accordance with Regional Guidance for Hydrologic and Hydraulic Studies in Support of the Model Ordinance for Floodplain Management under the National Flood Insurance Program and the Endangered Species Act, FEMA, Region X, 2010.
F. The floodplain administrator shall use the most restrictive data available prepared specifically for the project site for the channel migration zone, floodways, future conditions, and riparian buffer zone. (Ord. 6761 § 1 (Exh. A), 2020.)