Form 81-89D Coastal Structures Form

DEPARTMENT OF HOMELAND SECURITY
FEDERAL EMERGENCY MANAGEMENT AGENCY

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

COASTAL STRUCTURES 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. BACKGROUND

1. Name of structures (if applicable):
2. Sturcture location:
3. Type of structure:
Levee/Floodwall*

Anchored Bulkhead

Revetment

Breakwater

Pile supported seawall

Other

Gravity Seawall

*Note: If the coastal structure is a levee/floodwall, complete section E of Form 3 (Riverine Structures Form). The remainder of this form
does not need to be completed.
4. Material structure is composed of (check all that apply):
Stone

Earthen fill

Concrete

Steel

Sand

Other

5. The structure is (check one):
New or proposed

Existing

Modification of existing structure

Replacement structure of the same size and design as what was previously at the site.

Describe in detail the existing structure and/or modifications being make to the structure and the purpose of the modifications.

If existing, please include date of contruction:
6. copies of certified "as-built"plans

are

are not attached. Attach all design analysis that apply.

If "as-built" plans are not available for submittal, please explain why and submit a sketch with general structure dimensions including: face
slop, height, length, depth, and toe elevation referenced to the appropriate datum (e.g., NGVD 1929, NAVD 1988, etc.)
7. Has a Federal agency with responsibility for the design of coastal flood protection structures designed or certified that the structures have
been adequately designed and constructed to provide protection against the 1%-annual-chance event?
No
Yes
If Yes, specify the name of the agency and dates of the project completion and certification.

If Yes, then no other sections of this form need to be completed..
FEMA Form 81-89D, JAN 07

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B. DESIGN CRITERIA

1. Design Parameters
a. Were physical paremters representing the 1%-annual-chance event or greater used to design the coastal flood protection structure?
Yes

No

b. The number of design water levels that were evaluated

(number) range from the mean low water elevation of

feet to the 1%-annual-chance stillwater surge elevation of
elevations are referenced to is

feet. The critical water level is

feet. The datum that these

e.g., NGVD 1929, NAVD 1988, etc.)

Attach an explanation specifying which water levels and associated wave heights and periods were analyzed.
c. Were breaking wave forces used to design the structure?

Yes

No

If No, attach an explanation why they were not used for design.

2. Settlement
a. What is the expected settlement rate at the site of the structure?
Please attach a settlement analysis.
3. Freeboard
a. Does this structure have 1 foot of freeboard above the height of the 1%-annual-chance wave-height elevation or maximum wave runup
(whichever is greater)?
No
Yes
b. Does the structure have freeboard of at least 2 feet above the 1%-annual-chance stillwater surge elevation?

Yes

No

4. Toe Protection
Specify the type of toe protection:
If no toe protection is provided, provide anaysis of scour potential and attach an elevation of structural stability performed with potential
scour at the toe.
5. Backfill Protection
Will the structure be overtopped during the 1%-annual-chance event?

Yes

No

If the structure will be overtopped, attach an explanation of what measures are used to prevent the loss of backfill from rundown over the
structure, drainage landward, under or laterally around the ends of the structure, or through seams and drainage openings in the structure.
6. Structural Stability - Minimum Water Level
a. For coastal revetments, was a geotechnical analysis of potential failure in the landward direction by rotational grativity slip performed for
maximum loads associated with minimum seaward water level, no wave action, saturated soil conditions behind the structure, and
Maximum toe scour?
No
Yes

b. For gravity and pile-supported seawalls, were engineering analysis of landward sliding, landward overturning, and of foundation adequacy
using maximum pressures developed in the sliding and overturning calculations performed?
Yes

No

c. For anchored bulkheads, were engineering analysis performed for shear failure, moment failure, and adequacy of tiebacks and deadmen to
deadmen to resist loading under low-water conditions?
Yes

No

7. Structural Stability - Critical Water level (Note: All structures must be designed to resist the maximum loads associated with the critical
water level to be credited as providing protection from the 1%-annual-chance event.
a. For coastal revetments, were geotechnical analysis performed investigating the potential failure in the seaward direction by rotational
gravity slip or foundation failure due to inadequate bearing strength?
Yes

FEMA Form 81-89D, JAN 07

No

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B. DESIGN CRITERIA (Continued)

7. Structural Stability - Critical Water level (continued)
b. For revetments, were engineering analysis of rock, riprap, or armor block's stability under wave action or uplift forces on the rock, riprap
or armor blocks performed?
Yes
No
c. Are the rocks graded?

Yes

No

d. Are soil or geotextile filters being used in the design?

Yes

No

e. For gravity and pile supported seawalls, were engineering analysis of landward sliding, landward overturning, and foundation adequecy
performed?
No
Yes
f. For anchored bulkheads, were engineering analysis of shear and moment failure perfomed using "shock" pressures?

Yes

No

For all analysis marked "No" above for the appropriate type of structure, please attach an explanation for why the analysis were not
performed.
8. Material Adequacy
The design life of the structure given the existing conditions at the structure site is

years.

9. Ice and Impact Alignment
a. Will the structure be subject to ice forces?

Yes

No

If Yes, attach impact analysis and design for details for such forces.

b. Will the structure be subjected to impact forces from boats, ships, or large debris?

Yes

No

If Yes, attach impact analysis.

10. Structure Plan Alignment
The structure is (check one):

Part of a continuos structure redundant return walls at frequent intervals.

Isolated

Please provide a map showing the location of the structure and any natural land features that shelter the structure from wave actions.
C. ADVERSE IMPACT EVALUATION

1. If the structure is new, proposed, or modified, will the structure impact flooding and erosion for areas adjacent to the structure?
Yes

No

If Yes, attach an explanation
D. COMMUNITY AND/OR STATE REVIEW

1. Has the design, maintenance, and impact of the structure been reviewed and approved by the community, and any Federal, State, or local
agencies having jurisdiction over flood control and coastal construction activities in the area the structure impacts?
Yes

No

If Yes, attach a list of agencies who have reviewed and approved the project.
If No, attach an explanation why review and approval by the appropriate community or agency has not been obtained.
E. CERTIFICATION

As a Professional Engineer, I certify that the above structures will withstand all hydraulic and wave forces associated with the 1%-annual-chance
flood without significant structural degradation. All documents submitted in support of this request are correct to the best of my knowledge. I
understand that any false statement may be punishable by fine or imprisonment under Title 18 of the United States Code, Section 1001.
Certifier's Name

License No.

Expiration Date

Company Name

Telephone No.

Fax No.

Signature

Date

Seal (optional)
FEMA Form 81-89D, JAN 07

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