FEMA Form FF-206-F Riverine Hydrology and Hydraulics (Form 2)

DEPARTMENT OF HOMELAND SECURITY

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

Federal Emergency Management Agency
RIVERINE HYDROLOGY & HYDRAULICS FORM (FORM 2)
PAPERWORK BURDEN DISCLOSURE NOTICE

Public reporting burden for this form is estimated to average 3.5 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.

PAPERWORK BURDEN DISCLOSURE NOTICE

DRAFT

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).
Flooding Source:

NOTE: Fill out one form for each flooding source studied.

A. HYDROLOGY

1. Reason for New Hydrologic Analysis (check all that apply)
Not revised (Skip to Section B)
Proposed Conditions (CLOMR)

No existing analysis
Improved data
Changed physical condition of watershed

Alternative methodology

2. Comparison of Representative 1%-Annual-Chance Discharges
LOCATION

DRAINAGE AREA (Sq. Mi.)

EFFECTIVE/FIS (cfs)

REVISED (cfs)

3. Methodology for New Hydrologic Analysis (check all that apply)
Precipitation/Runoff Model
Specify Model:
Statistical Analysis of Gage Records
Regional Regression Equations
Other (please attach descriptions)

Duration:

Rainfall Amount:

Please enclose all relevant models in digital format, maps, computations (including computation of parameters), and documentation
to support the new analysis.
4. Review/Approval of Analysis
If your community requires a regional, state, or federal agency to review the hydrologic analysis, please attach evidence of approval/
review.
5. Impacts of Sediment Transport on Hydrology
Is the hydrology for the revised flooding source(s) affected by sediment transport?
Yes (If "Yes," then fill out Section F (Sediment Transport) of Form 3)

FEMA Form FF-206-FY-21-101 (formerly 086-0-27A) (1/24)

No (If "No," then attach your explanation)

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B. HYDRAULICS
1. Reach to be Revised
DESCRIPTION

WATER SURFACE ELEVATION (ft)

CROSS SECTION

EFFECTIVE

DOWNSTREAM LIMIT*
UPSTREAM LIMIT*

PROPOSED/
REVISED

*Proposed/Revised elevations must tie-into the Effective elevations within 0.5 foot at the downstream and upstream limits of revision.

2. Hydraulic Method/Model Used
Steady State

Unsteady State

One-Dimensional

Two-Dimensional

3. Pre-Submittal Review of Hydraulic Models*

DRAFT

DHS-FEMA has developed two review programs, CHECK-2 and CHECK-RAS, to aid in the review of HEC-2 and HEC-RAS
hydraulic models, respectively. We recommend that you review your HEC-2 and HEC-RAS models with CHECK-2 and CHECKRAS.
4. HEC-RAS File Description**
MODELS SUBMITTED

NATURAL RUN

FILE NAME

PLAN NAME

FLOODWAY RUN

FILE NAME

PLAN NAME

DATUM

DUPLICATE EFFECTIVE
MODEL*

CORRECTED EFFECTIVE
MODEL*

EXISTING OR PRE-PROJECT
CONDITIONS MODEL

REVISED OR POST-PROJECT
CONDITIONS MODEL
OTHER (attach description)

* For details, refer to the corresponding section of the instructions.

Digital Models Submitted? (Required)

**See instructions for information about modeling other then HEC-RAS.

C. MAPPING REQUIREMENTS
A certified topographic work map must be submitted showing the following information (where applicable): the boundaries of the
effective, existing, and proposed conditions 1%-annual-chance floodplain (for approximate Zone A revisions) or the boundaries of
the 1%- and 0.2%-annual-chance floodplains and regulatory floodway (for detailed Zone AE, AO, and AH revisions); location and
alignment of all cross sections with stationing control indicated; stream, road, and other alignments (e.g., dams, levees, etc.); current
community easements and boundaries; boundaries of the requester's property; certification of a registered professional engineer
registered in the subject State; location and description of reference marks; and the referenced vertical datum (NGVD, NAVD, etc.).
Digital Mapping (GIS/CADD) Data Submitted (preferred)
Source
Topographic
Information

Vertical Datum

Date
Spatial Projection

Accuracy
Note that the boundaries of the existing or proposed conditions floodplains and regulatory floodway to be shown on the revised
FIRM and/or FBFM must tie-in with the effective floodplain and regulatory floodway boundaries. Please attach a copy of the
effective FIRM and/or FBFM, at the same scale as the original, annotated to show the boundaries of the revised 1%-and 0.2%annual-chance floodplains and regulatory floodway that tie-in with the boundaries of the effective 1%-and 0.2%-annual-chance
floodplain and regulatory floodway at the upstream and downstream limits of the area on revision.
Annotated FIRM and/or FBFM (Required)
FEMA Form FF-206-FY-21-101 (formerly 086-0-27A) (1/24)

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D. COMMON REGULATORY REQUIREMENTS*
1. For LOMR/CLOMR requests, do Base Flood Elevations (BFEs) or Special Flood Hazard Areas (SFHAs)
increase compared to the effective BFEs?
If "Yes," please attach proof of property owner notification. Examples of property owner
notifications can be found in the MT-2 Form 2 Instructions.

Yes

No

Yes

No

2. For CLOMR requests, if either of the following is true, please submit evidence of compliance with Section
65.12 of the NFIP regulations:
• The proposed project encroaches upon a regulatory floodway and would result in increases above
0.00 foot compared to pre-project conditions.
• The proposed project encroaches upon a SFHA with or without BFEs established and would result
in increases above 1.00 foot compared to pre-project conditions.
3. Does the request involve the placement or proposed placement of fill?

DRAFT
If "Yes," the community must be able to certify that the area to be removed from the special flood
hazard area, to include any structures or proposed structures, meets all of the standards of the local
floodplain ordinances, and is reasonably safe from flooding in accordance with the NFIP regulations
set forth at 44 CFR 60.3(A)(3), 65.5(a)(4), and 65.6(a)(14). Please see the MT-2 instructions for
more information.

4. For LOMR requests, is the regulatory floodway being revised?

Yes

No

If "Yes," attach evidence of regulatory floodway revision notification. As per Paragraph 65.7(b)
(1) of the NFIP Regulations, notification is required for requests involving revisions to the regulatory
floodway. Elements and examples of regulatory floodway revision notification can be found in the
MT-2 Form 2 Instructions.

5. For CLOMR requests, please submit documentation to FEMA and the community to show that you have complied with Sections 9
and 10 of the Endangered Species Act (ESA). For actions authorized, funded, or being carried out by Federal or State agencies,
please submit documentation from the agency showing its compliance with Section 7(a)(2) of the ESA. Please see the MT-2
instructions for more detail.

FEMA Form FF-206-FY-21-101 (formerly 086-0-27A) (1/24)

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