Form 81-89C Coastal Analysis Form

DEPARTMENT OF HOMELAND SECURITY
FEDERAL EMERGENCY MANAGEMENT AGENCY

O.M.B. NO. 1660-0016
Expires August 31, 2007

COASTAL ANALYSIS FORM

PAPERWORK BURDEN DISCLOSURE NOTICE
Public reporting burden for this form is estimated to average 1 hour 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 a vaild OMB control number appears in the upper right corner of this form.
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.
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 setup computations

Wave height computations

Wave runup computations

Wave overtopping computations

dune erosion computations

Primary Frontal Dune Assessment

N/A (area not studied by detailed methods)
C. REVISED ANALYSIS

1. Number of transects in revised analyses:
2. Information used to prepare the revision (check all that apply):
Wave setup analyses (complete items 3,4, and 5 below)

Wave overtopping assessment (complete items 4 and 5)

Stillwater elevation determinations (complete item 3)

More detailed topographic information (complete Section E)

Erosion considerations (complete item 4)

Shore protection structures (attach completed Coastal Structures Form - Form 5)

Wave runup analysis (complete items 4 and 5)

Primary frontal dune assessment (complete item 5)

Wave height analysis (complete items 4 and 5)

Other, attach basis of revision request with an explanation

3. Stillwater Elevation Determination
a. How were Stillwater elevations determined?
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 calculions:
If not the FIS datum, have the calculations been adjusted to the FIS datum?
c. If revised storm surge analysis, was FEMA's storm surge model utilized?

Yes

No

Yes

No

Conversion factor:

d. If FEMA's storm surge model was used, attach a detailed description of the difference between the current and the revised analysis, and
why the revised analysis should replace the current analysis.
e. If wave setup was computed, attach a description of methodology used.
Amount of wave setup added to stillwater elevation:
FEMA Form 81-89C, JAN 07

feet
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C. REVISED ANALYSIS (continued)

4. Revised Analysis (i.e., erosion, wave height, wave runup, primary frontal dune, and wave overtopping)
If FEMA procedures were utilized to perform the revision, attach a detailed description of differences between the current and the revised
analysis, and why the revised analysis should replace the current analysis.
If FEMA procedures were not utilized to perform the revision, provide full documentation on methodology and/or models used; including
operational program, and detailed difference between methodology and/or models utilized and FEMA's methodology and/or models. Also,
attach an explanation ofwhy new methodology and/or models should replace current methodology and/or models.
If revision reflects more detailed topographic information and fill has bee/will be placed in a V-Zone, and is not protected from erosion by a
shore protection structure, provide a detailed description of how the fill has been treated in the revised analysis.
5. Wave Runup, Wave Height, an Wave Overtopping Analysis
Wave height analysis along a transect are greatly affected by starting wave conditions that propagate inland. Wave runup and overtopping
analysis are typically considered when wave heights and/or wave runup are close to or greater than the 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

b. Was wave setup included in wave height analysis and removed for erosion and wave runup analysis?
Yes

No

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

No

If Yes, attach an explanation ofth methodology utilized and describe in detail the results of the analysis.
If overtopping was not analyzed, attach an explanation for why these analysis were not performed.
D. RESULTS

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

feet

Datum

feet

9. The Base Flood Elevations have:

3. Starting deep-water significant wave condition:
height

increased

period

4. Maximum wave runup height elevation:

feet

5. Maxium wave runup elevation:

feet

6. Estimated amount of maximum overtopping:

decreased

decreased

a. What was the greatest increase?

feet

b. What was the greatest decrease?

feet

10. The special flood hazard area has:
increased

decreased

both

cfs/feet

7. The areas designated as coastal high hazard areas V-Zone have:
increased

8. As a result of the revised analysis, the V-Zone location has shifted
a maximum of
feet
feet seaward and
landward of its existing positon.

Attach a description where it has increased or decreased

both

Attach a description where they have increased and/or decreased
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.

FEMA Form 81-89C, JAN 07

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