FEMA Form FF-206-F Coastal Analysis (Form 4)

OMB Control Number: 1660-0016
Expiration: 1/31/2024

DEPARTMENT OF HOMELAND SECURITY

Federal Emergency Management Agency
COASTAL ANALYSIS FORM (FORM 4)
PAPERWORK BURDEN DISCLOSURE NOTICE

Public reporting burden for this form is estimated to average 1 hours per response. The burden estimate includes the time for reviewing instructions,
searching existing data sources, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not
required to respond to this collection of information unless it displays a valid OMB control number. Send comments regarding the accuracy of the
burden estimate and any suggestions for reducing this burden to: Information Collections Management, Department of Homeland Security, Federal
Emergency Management Agency, 500 C Street, SW, Washington, DC 20472, Paperwork Reduction Project (1660-0016). Submission of the form is
required to obtain or retain benefits under the National Flood Insurance Program. Please do not send your completed survey to the above
address.

PRIVACY ACT STATEMENT
AUTHORITY: The National Flood Insurance Act of 1968, Public Law 90-448, as amended by the Flood Disaster Protection Act of 1973, Public Law
93-234.
PRINCIPAL PURPOSE(S): This information is being collected for the purpose of determining an applicant's eligibility to request changes to National
Flood Insurance Program (NFIP) Flood Insurance Rate Maps (FIRM).
ROUTINE USE(S): The information on this form may be disclosed as generally permitted under 5 U.S.C § 552a(b) of the Privacy Act of 1974, as
amended. This includes using this information as necessary and authorized by the routine uses published in DHS/FEMA/NFIP/LOMA-1 National
Flood Insurance Program (NFIP); Letter of Map Amendment (LOMA) February 15, 2006, 71 FR 7990.
DISCLOSURE: The disclosure of information on this form is voluntary; however, failure to provide the information requested may delay or prevent
FEMA from processing a determination regarding a requested change to a (NFIP) Flood Insurance Rate Maps (FIRM).

DRAFT

Flooding Source:

Note: Fill out one form for each flooding source studied

A. COASTLINE TO BE REVISED

Describe limits of study area:

B. EFFECTIVE FIS

The area being revised in the effective FIS was studied by detailed methods using (check all that apply):
Storm surge modeling
Wave height computations
Wave overtopping computations
Primary Frontal Dune Assessment

Wave setup computations
Wave runup computations
Dune erosion computations
N/A (area not studied by detailed methods)

C. REVISED ANALYSIS
1. Number of transects in revised analysis:
2. Information used to prepare the revision (check all that apply):
Wave setup analysis (complete Items 3, 4, and 5 below)
Stillwater elevation determinations (complete Items 3)
Erosion considerations (complete Items 4)
Non-accredited shore protection structure (complete Items 4)
Wave runup analysis (complete Items 4 and 5)
Wave height analysis (complete Items 4 and 5)

Wave overtopping assessment (complete Items 4 and 5)
More detailed topographic information (complete Section E)
Accredited shore protection structure (attach completed
Coastal Structures Form - Form 5)
Primary Frontal Dune Assessment (complete Items 5)
Other, attach basis of request with explanation

3. Stillwater Elevation Determination
a. How were stillwater elevations determined?
Effective FIS Report

Date of FIS Report:

Transect Number

Gage analysis (If revised gage analysis was used, provide copies of gage data and revised analysis.)
Storm surge analysis
Other (Describe):
b. Specify what datum was used in the calculations:
If not the FIS datum, have the calculations been adjusted to the FIS datum?
FEMA Form FF-206-FY-21-103 (formerly 086-0-27C) (1/24)

Yes

No

Conversion Factor
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C. REVISED ANALYSIS (Continued)
c. Was wave setup included in wave height analysis and removed for wave runup analyses?

Yes

No

d. Was an overtopping analysis performed for any coastal shore protection structures or
natural land forms that may be overtopped?

Yes

No

Attach an explanation of the methodology utilized and describe in detail the results of the analysis.
e. Is wave setup included?

Yes

No

Source:

Effective FIS Report

New Analysis

If wave setup was computed, attach a description of methodology used.
4. Revised Analysis (i.e., erosion, wave height, wave runup, primary frontal dune, and wave overtopping)
If DHS-FEMA procedures were utilized to perform the revision, attach a detailed description of differences between the current
and the revised analyses, and why the revised analysis should replace the current analysis.
If DHS-FEMA procedures were not utilized to perform the revision, provide full documentation on methodology and/or models
used; including operational program, detailed differences between methodology and/or models utilized and DHS-FEMA's
methodology and/or models. Also, attach an explanation of why new methodology and/or models should replace current
methodology and/or models.

DRAFT

If revision reflects more detailed topographic information and fill has been/will be placed in a V Zone, and is not protected from
erosion by an accredited shore protection structure, provide a detailed description of how the fill has been treated in the revised
analysis.
5. Wave Runup, Wave Height, And Wave Overtopping Analysis

Wave height analyses along a transect are greatly affected by starting wave conditions that propagate inland. Wave runup and
overtopping analyses are typically considered when the stillwater elevation including wave setup is less thanthe crest of shore
protection structures or natural land forms.
a. Was an analysis performed to determine starting wave height and period for input into WHAFIS?

Yes

No

If Yes, attach an explanation of the method utilized. If No, explain why these analyses were not performed.

b. Was wave setup included in the reference water level used to calculate the dune reservoir volume?

Yes

No

c. Was wave setup included in wave height analysis and removed for wave runup analyses?

Yes

No

d. Was an overtopping analysis performed for any coastal shore protection structures or natural land
forms that may be overtopped?

Yes

No

Attach an explanation of the methodology utilized and describe in detail the results of the analysis.

D. RESULTS
1. Stillwater storm surge elevation:
2. Wave setup:

Datum

feet

a maximum of

feet

3. Starting deep-water significant wave condition:
height:

4. Maximum wave height elevation:

6. Estimated amount of overtopping:

feet landward

feet seaward and

of its existing position.

period:

5. Wave runup elevation:

9. As a result of the revised analyses, the V zone location has shifted

feet
feet
cfs/feet

7. Has this revision changed the Limit Moderate Wave Action
(LiMWA)?
Yes
No
N/A
8. The areas designated as coastal high hazard areas (Vzones)
have:
Yes
No
N/A
Attach a description where they have increased and/or
decreased.
FEMA Form FF-206-FY-21-103 (formerly 086-0-27C) (1/24)

10. Does the revision reflect the location of the primary frontal
dune?
Yes
No
11. The Base Flood Elevations have:
Increased
Decreased
a. What was the greatest increase?

feet

b. What was the greatest decrease?

feet

12. The special flood hazard area has:
Increased
Decreased

Both

Attach a description where it has increased or decreased.

Page 2 of 3

E. MAPPING REQUIREMENTS
A certified topographic map must be submitted showing the following information (where applicable): effective, existing conditions,
and proposed conditions 1%-annual-chance floodplain boundaries, revised shoreline due to either erosion or accretion, location and
alignment of all transects, correct location and alignment of any structures, current community easements and boundaries, boundary
of the requester's property, certification of a professional engineer registered in the subject State, location and description of
reference marks, and the referenced vertical datum (NGVD, NAVD, etc.).
Note that the existing or proposed conditions floodplain boundaries to be shown on the revised FIRM must tie-in with the effective
floodplain boundaries. Please attach a copy of the current FIRM annotated to show the revised 1%-annual-chance floodplain
boundaries that tie-in with effective 1%-annual-chance floodplain boundaries along the entire extent of the area of revision.

DRAFT
FEMA Form FF-206-FY-21-103 (formerly 086-0-27C) (1/24)

Page 3 of 3