The National Flood Insurance Program Regulations

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The National Flood Insurance Program Regulations Powered By Docstoc
					National Flood Insurance Program
   CLOMR/LOMR Workshop
       Northglenn, CO – February 2006

          Marijo Camrud, P.E., CFM – FEMA
             David Mallory, P.E. – UDFCD
    Craig Jacobson, P.E., CFM – ICON Engineering
    Kevin Doyle, P.E., CFM – Michael Baker Jr., Inc.
                         Flood Map
Welcome                  Modernization




 • Introductions
 • Facilities Overview
 • Breaks and Lunch
                                         Flood Map
LOMR Workshop Overview                   Modernization




   Introduction
    – Amendments vs. Revisions
    – LOMRs, CLOMRs, PMRs

 • Applicable NFIP Regulations
 • LOMR Examples
 • Data Required/Completing MT-2 Forms
 • Common LOMR Problems and Examples
 • The FEMA Review Process
 • Conclusion and Questions
                                              Flood Map
Definitions                                   Modernization




 • Base Flood – 1% Annual chance flood
   (100-year)
 • BFE – Base Flood Elevation
 • SFHA – Special Flood Hazard Area
 • FIS – Flood Insurance Study
 • FIRM – Flood Insurance Rate Map
 • FBFM – Flood Boundary Floodway Map
 • Additional Definitions in the MT-2 Forms
    • Page 26 of the handout
    LOMCs (Letter of Map Change)                                         Flood Map
                                                                         Modernization
    Revisions versus Amendments

•    Amendment:                                   •   MT-1:
      –   Structures or legally defined parcels       –   LOMA
      –   Does Not Involve H&H Analysis               –   LOMR-F
          (Unless Approximate Zone A)                 –   Conditionals
      –   Does NOT change the FIRM or FIS
      –   Requires Submittal of MT-1 Forms

•    Revision:                                    •   MT-2:
      –   More complex map changes                    –   LOMR
      –   Not usually lot or structure specific       –   Conditional
      –   Typically involves H&H Analysis             –   PMR
      –   Requires submittal of MT-2 Forms
                                                                           Flood Map
Engineering Revisions                                                      Modernization




•   Basis for Revisions:
    – New or More Detailed Analyses
        •   Updated hydrology
        •   Additional hydraulic information (more cross sections, etc.)
        •   New topographic information
        •   No previous study (Zone A)
    – Physical Changes
        •   Projects (bridge/culvert, channelization, levee, etc.)
        •   Natural Changes (erosion, subsidence, bridge/culvert removal, etc.)
    – Error Corrections
                                                  Flood Map
Letter of Map Revision (LOMR)                     Modernization




•   Revises the effective map to show changes in BFEs,
    floodplains, and floodways
•   FIRM and FIS report are not republished, but
    annotated maps, profiles, and tables are attached to
    letter
                                                                  Flood Map
Letter of Map Revision (LOMR)                                     Modernization




Cover Letter             Determination              Annotated FIRM
                          Document



                                                                     Refer to
                                                                      LOMR
                                                                     Handout
  Annotated FIS Tables                   Annotated FIS Profiles
Conditional Letter of Map                      Flood Map
                                               Modernization
Revision (CLOMR)

•   CLOMRs are for proposed projects
•   FEMA’s comment on the effects that a proposed
    project would have on the FIRM
•   Does not revise map; must be followed by a LOMR
    request when project completed
Conditional Letter of Map                              Flood Map
                                                       Modernization
Revision (CLOMR)

                           •   Typical Elements of a
                               CLOMR Letter
                               –   Project Description
                               –   FEMA’s Comment
                               –   Comparison of Changes
                               –   LOMR submittal
                                   requirements
                                   • Include a copy of CLOMR
                                     letter with LOMR submittal
                                     (optional but helpful)
                               – Community Information



  Refer CLOMR to Handout
                                                   Flood Map
Physical Map Revision (PMR)                        Modernization




•   FEMA review of hydrologic/hydraulic analyses and
    mapping submitted by community
•   Republish FIRM and FIS report to incorporate
    changes in BFEs, floodplains, or floodways
•   Resolves protests and technical appeals
•   Revalidate LOMAs/LOMR-Fs as needed
                                                              Flood Map
    LOMR verses PMR                                           Modernization




•   LOMR:                          •   PMR:
    – Typically                        – Typically
        •   Revision is Small              •   Revision is Extensive
        •   Decreases or                   •   Flood hazard increases
            minimal increases                  or new flood hazards are
    – Advantages                               established
        •   Faster                     – Advantages
        •   Less Expensive                 •   Larger Distribution
    – Disadvantages                    – Disadvantages
        •   Limited Distribution           •   More Expensive
                                           •   Slower
                                           •   Dependant on Regional
                                               Funds
                                                             Flood Map
LOMR Requirements                                            Modernization




•   When is a LOMR Required
    – Any change (increases or decreases) in BFE resulting from
      physical changes.
    – Requests involving:
        •   Floodway changes
        •   Changes or properties In alluvial fan areas
        •   Changes in coastal high hazard areas
                                                                        Flood Map
CLOMR Requirements                                                      Modernization




•   When a CLOMR is Required
    – Proposed projects that:
        •   Encroach upon the floodway and cause an increase > 0.00 ft
        •   Encroach upon a floodplain when a floodway has not been
            established and causes an increase of > 1.00 ft
             – Includes all existing and anticipated development - 60.3(c)(10)
             – Includes Approximate Zone A
                 • May require development of a model
    – What is an increase
        •   Comparison between pre-project (existing conditions) and post
            project (proposed conditions) model
                                         Flood Map
LOMR Workshop Overview                   Modernization




 • Introduction
   Applicable NFIP Regulations
    – What are the Regulations
    – Overview of Common Regulations
    – State and Local Requirements

 • LOMR Examples
 • Data Required/Completing MT-2 Forms
 • Common LOMR Problems and Examples
 • The FEMA Review Process
 • Conclusion and Questions
                                                                Flood Map
    Applicable Regulations                                      Modernization




•    National Flood Insurance Program (NFIP)
     Regulations
     – Chapter 44 of the Code of Federal Regulations (44 CFR)
     – Parts 60, 65, and 72 apply to MT-2 LOMCs

•    Obtaining the Regulations
     – Regulations can be downloaded at:
       www.access.gpo.gov/nara/cfr/waisidx_02/44cfrv1_02.html
                                                                    Flood Map
Part 65                                                             Modernization




         Identification and Mapping of
             Special Hazard Areas

•   Purpose of Part 65
    – To outline steps a community needs to take to assist FEMA’s
      effort in providing up-to-date identification and publication of flood
      hazard maps.
                                                Flood Map
Section 65.3                                    Modernization




         Requirement to Submit New
               Technical Data

•   A community’s BFEs may increase or decrease from
    physical changes affecting flooding
•   A community should notify FEMA within 6 months of
    the changes.
                                                              Flood Map
Section 65.4                                                  Modernization




    Right to Submit New Technical Data

•   A community has a right to request changes to any
    of the information on the FIRM.
    – Examples: Community boundaries, labeling, planimetric details.

•   Requests for changes to effective maps, except for
    those initiated by FEMA, must be initiated by
    community’s CEO or CEO’s designee.
                                                 Flood Map
Section 65.5                                     Modernization




    Revision to Special Hazard Area Boundaries
      With No Change to BFE Determinations


•   In SFHAs (except Floodways), it may be feasible to
    elevate areas with fill above the BFE.
•   LOMR-Fs are processed under provisions of Section
    65.5.
                                                             Flood Map
Section 65.6                                                 Modernization




            Revisions of BFE Determinations

•   Section 65.6 describes the data required for a
    request to revise BFEs
•   Supporting data must include:
    – All the information FEMA needs to review the request
    – May involve:
        •   New H&H
        •   New Floodplain and Floodway delineations
                                                 Flood Map
Part 65 – Common Sections                        Modernization




•   Section 65.7 – Floodway revisions
•   Section 65.10 - Mapping of areas protected by levee
    systems
•   Section 65.12 – Revision of flood insurance rate
    maps to reflect base flood elevations caused by
    proposed encroachments:
    – CLOMR requirements
    LOMR/CLOMR State and Local                               Flood Map
                                                             Modernization
    Requirements

•    State Approval
      – R5 – IL, IN, MI, MN, and WI
      – R7 – IA Floodway revisions
      – Check with your state
          •   Not Required in R8 at present time

•    State and local regulations
      – Can be more restrictive than the federal standards
      – Check with your state
      – Coordinate with the community on what they require
    LOMR/CLOMR State and Local                                                 Flood Map
                                                                               Modernization
    Requirements

•    UDFCD Recommendations
      – Communities should adopt more restrictive regulations
          •   Request a CLOMR for all development within the SFHA (including
              Zone A) prior to final plat & construction plan approval

          •   Show effective and proposed floodplains on the final plat

          •   Restrict property transfer for all lots within the effective SFHA until
              the LOMR becomes effective

          •   Review grading and foundation plans to assure lowest floor
              elevations (basement, crawl space, etc. are elevated above the
              BFEs plus freeboard

          •   No Levees (Certified or Uncertified)
    LOMR/CLOMR State and Local                                          Flood Map
                                                                        Modernization
    Requirements

•    UDFCD Recommendations
      – Benefits of District Maintenance Eligibility
          •   Additional expertise for major drainageway plan reviews

          •   Coordinated implementation of District sponsored master plans

          •   Coordination with the FEMA LOMC review process

          •   Additional drainageway maintenance resources
                                         Flood Map
LOMR Workshop Overview                   Modernization




 • Introduction
 • Applicable NFIP Regulations
   LOMR Examples
    – Massey Draw Example
    – Creating Data for LOMRs

 • Data Required/Completing MT-2 Forms
 • Common LOMR Problems and Examples
 • The FEMA Review Process
 • Conclusion and Questions
                                 Flood Map
Massey Draw Example              Modernization




 • UDFCD PowerPoint and Videos
                          Flood Map
Creating Data For LOMRs   Modernization




 • Hands On Example
                                                  Flood Map
LOMR Workshop Overview                            Modernization




 • Introduction
 • Applicable NFIP Regulations
 • LOMR Examples
   Data Required/Completing MT-2 Forms
    – Obtaining Backup Data
    – LOMR/CLOMR Requirements
    – Roles and Responsibilities of Communities

 • Common LOMR Problems and Examples
 • The FEMA Review Process
 • Conclusion and Questions
                                          Flood Map
    Obtaining Backup Data                 Modernization




•   Map Service Center
    – FIRMs, FISs, and some LOMCs
•   FEMA Library
    – Backup FIS and LOMC data
•   Mapping Information Platform (MIP)
    – LOMCs, DFIRM data
    – Future – Backup FIS and LOMC data
•   UDFCD
    – Data in the District
        •   FIRMs, FISs, and some LOMCs
        •   Backup FIS and LOMC data
                                           Flood Map
    Obtaining Backup Data - MSC            Modernization




•   Effective FIRMs and FISs
    – FEMA Map Service Center -
      http://msc.fema.gov
       •   Copies of Effective FIRMs
           (FBFMs), FISs, and some LOMCs
       •   Can order paper copies, or be
           obtained online
    – UDFCD – 303.455.6277
       •   Effective FIRMs (FBFMs) FISs,
           and LOMCs in the district
           boundaries.
                                                                         Flood Map
    Obtaining Backup Data - Library                                      Modernization




•    FIS and LOMC Backup Data
      – Request must be in writing
          •   U.S. mail, e-mail, or fax
          •   Forms and instructions available on the FEMA web site
              http://www.fema.gov/fhm/st_order.shtm
      – Approximate 2-week turnaround
      – Initial cost of $120
          •   Average total cost $160
      – FEMA Library – 703.236.7461
      – UDFCD – 303.455.6277
          •   Studies and LOMC backup data in the district boundaries.
                                            Flood Map
    Obtaining Backup Data - MIP             Modernization




•   MIP – Mapping Information
    Platform
    – http://hazards.fema.gov
    – Data Available Now
        •   LOMC Reports
             – Under Tools & Links\Public
               Reports
        •   DFIRM data
             – Access through Arc GIS
    – Data Available in the Future
        •   FIS Backup Data
                                                                 Flood Map
CLOMR/LOMR Requirements                                          Modernization




•   Required for All LOMRs and CLOMRs
    – MT-2 Forms
        •   Available at: http://www.fema.gov/fhm/dl_mt-2.shtm
    – Fee
    – Project Narrative
        •   Optional, but very helpful
    – Annotated FIRM and/or FBFM
    – Data certified by a registered professional engineer or licensed
      surveyor
    – Revision request acknowledged by all impacted communities
                                                          Flood Map
MT-2 Forms
MT-2                                                      Modernization




•   Most Common Forms
    –   Form 1 – Overview and Concurrence Form
    –   Form 2 – Riverine Hydrology and Hydraulics Form
    –   Form 3 – Riverine Structures Form
    –   Payment Information Form
•   Additional Information in the Instructions Packet
    –   Definitions
    –   Instructions on completing the forms
    –   Instructions on what needs to be submitted
    –   Example notifications
    –   Useful internet links
                                                                                           Flood Map
Current LOMC Fees                                                                          Modernization




    Product or Service                                                 User Fee

             LOMRs/PMRs

    Bridge, Culvert, Channel or Combination                                $4,400

    Levee, Berm, or Other Structural Measure                               $6,000

    As-Built Follow-up to CLOMR                                            $4,000

    Detailed Data                                                             $0

   Fee Schedule as of February 8th, 2006. Check http://www.fema.gov/fhm/frm_fees.shtm for latest fees.
                                                                                           Flood Map
Current LOMC Fees                                                                          Modernization




    Product or Service                                                 User Fee

               CLOMRs
    Hydrology, Bridge, Culvert, Channel, or
                                                                           $4,000
    Combination

    Levee, Berm, or Other Structural Measure                               $5,000

    LOMRs and CLOMRs for Structural
                                                                          $5,6001
    Measures on Alluvial Fans
    1Initial   Fee Only - $60/hr thereafter
   Fee Schedule as of February 8th, 2006. Check http://www.fema.gov/fhm/frm_fees.shtm for latest fees.
                                                             Flood Map
Fee Exemptions                                               Modernization




•   Mapping or analysis error
•   Effects of natural changes
•   Adding detail to a Zone A
    – Not including manmade modifications
        •   Bridges, culverts, fill, drop structures, etc.

•   Flood-control projects that are 50% Federally funded
•   Improved data
    – Not including manmade modifications
        •   Bridges, culverts, fill, drop structures, etc.

•   Floodway Revision
                                                               Flood Map
    CLOMR/LOMR Requirements                                    Modernization




•    Any computer program used to perform H&H
     analysis in support of a LOMR must meet FEMA
     criteria.
     – FEMA’s acceptable model list:
       http://www.fema.gov/fhm/en_modl.shtm
•    Analysis should be done with the same model as the
     effective, unless
     – Alternative hydraulic methodology is more appropriate
     – Original model not available
•    Should evaluate the same recurrence interval(s) as
     the effective
                                                               Flood Map
    CLOMR/LOMR Requirements                                    Modernization




•    Revisions based on topographic changes
     – Must demonstrate that topographic changes have not resulted in
       floodway encroachment.
•    Revisions CANNOT be made based on proposed
     projects or future conditions.
     – CLOMRs will comment on the effects a proposed project will
       have, but will not officially revise the FIRM and FIS
                                                                          Flood Map
    CLOMR/LOMR Requirements                                               Modernization




•    Revisions based on changed discharges
     – Maps will not be revised when discharges change as a result of
       alternative methodology unless change is statistically significant
         •   50% confidence interval test (Guidelines and Specs – Appendix C)
         •   0.5 foot BFE test (Guidelines and Specs – Appendix C)

•    Revision request tie-ins
     – Revision request must be extensive enough to ensure a logical
       transition between:
         •   BFEs – must match within 0.5 ft at the transitions
         •   Floodplain and floodway boundaries – must tie in to the effective
             boundaries (Zone A example provided)
                                                                   Flood Map
    CLOMR/LOMR Requirements                                        Modernization




•    Correcting map errors
     – Original FIS contains mathematical or measurement errors
     – Data identifying mathematical errors
     – Data identifying measurement errors and providing correct
       measurements
         •   Survey bust in original study
                                                                      Flood Map
    CLOMR/LOMR Requirements                                           Modernization




•    Changed physical conditions
     – Affecting hydrologic conditions
         •   Description of change
              – Detention basin, dam, diversion channel
         •   Construction (As-Built) plans or survey
         •   New hydrologic analysis
              – Hydrologic model (electronic and paper)
              – Basin map
              – Description of inputs
         •   Hydraulic analysis using the new discharges
              – Hydraulic model (electronic and paper)
              – Description of inputs if changed from the effective model
         •   Revised delineations of the floodplain and floodway boundaries
              – Topographic workmap including the items listed on MT-2 Form 2
                                                                      Flood Map
    CLOMR/LOMR Requirements                                           Modernization




•    Changed physical conditions
     – Affecting hydraulic conditions
         •   Description of change
              – New bridge or culvert, channelization, levee
         •   Construction (As-Built) plans or survey
         •   New hydraulic analysis using the effective discharges
              – Hydraulic model (electronic and paper)
              – Description of inputs if changed from the effective model
         •   Revised delineations of the floodplain and floodway boundaries
              – Topographic work map including the items listed on MT-2 Form 2
                                                                      Flood Map
    CLOMR/LOMR Requirements                                           Modernization




•    Changed physical conditions
     – Involving topographic conditions
         •   Description of change
              – Grading or filling
         •   New topographic information
         •   Revised delineations of the floodplain and floodway boundaries
              – Topographic work map including the items listed on MT-2 Form 2
                                                                Flood Map
    CLOMR/LOMR Requirements                                     Modernization




•    Incorporating improved data
     – Data believed to be better
         •   More years of stream gage record
     – Documentation of source data
     – Explanation why the data will improve results
         •   More X-sections added to the hydraulic model
     – New hydrologic analysis
     – New hydraulic analysis
     – Revised delineation of the floodplain and floodway boundaries
                                                               Flood Map
    CLOMR/LOMR Requirements                                    Modernization




•    Incorporating improved methods
     – Alternative hydrology or hydraulics deemed more appropriate and
       change is significant
     – Explanation why the alternative methodology is superior
     – New hydrologic analysis
     – New hydraulic analysis
     – Revised delineation of the floodplain and floodway boundaries
                                                                         Flood Map
    CLOMR/LOMR Requirements                                              Modernization




•    For BFE and SFHA increases
     – Property owner notification
         •   All adversely impacted property owners
         •   Includes increases of the SFHA and/or shifting

•    Floodway Revisions
     – Public notice of floodway revision
     – State approval (if necessary)
     – Revised surcharges between 0.0 and 1.0 ft
         •   1.0 ft is the national surcharge standard some states are more
             restrictive.
     – Floodway analysis must use the same hydraulic model used to
       establish BFEs
                                                                    Flood Map
    CLOMR Requirements                                              Modernization




•    Section 65.12 Data Requirements
     –   Formal request and appropriate fees
     –   Evaluation of alternatives
     –   Certification that no structures are impacted
     –   Individual legal notices to all impacted property owners
     –   Concurrence from all impacted communities
•    Other data requirements
     – Same as LOMR, except data reflects proposed conditions
                                                               Flood Map
    CLOMR Requirements                                         Modernization




•    Project Built without CLOMR
     –   Coordination with FEMA Headquarters and Regional Office
     –   Possible violation
     –   Mitigate increase
     –   Return to previous condition
     –   Possible probation/suspension from NFIP
    Roles/Responsibilities of                                   Flood Map
                                                                Modernization
    Communities

•    Meet the standards of 60.3
      – Permits for all proposed development
          •   Building sites reasonably safe from flooding
      – Structures have to be elevated above BFE
      – Prohibit encroachment in a Zone AE that will increase BFEs more
        than 1.0 ft
          •   When a floodway is not established.
      – Prohibit encroachment in the floodway
    Roles/Responsibilities of                                     Flood Map
                                                                  Modernization
    Communities

•    Reasonably safe from flooding
      – Assuring by signing MT-2 Form 1
      – Technical Bulletin 10-01
      – http://www.fema.gov/pdf/fima/tb1001.pdf
•    Maintenance of channels and structures
      – Communities have to assure that the flood carrying capacity of
        any altered watercourse is maintained
      – Regulation 60.3(b)(7)
                                                                        Flood Map
LOMR Workshop Overview                                                  Modernization




 • Introduction
 • Applicable NFIP Regulations
 • LOMR Examples
 • Data Required/Completing MT-2 Forms
   Common LOMR Problems and Examples
    – Common Problems
    – Examples: Zone A LOMR, working with multiple models, bridge/overbank
      modeling, and uncertified levee.

 • The FEMA Review Process
 • Conclusion and Questions
    Common CLOMR/LOMR                             Flood Map
                                                  Modernization
    Submittal Problems

•    Most Common Submittal Problems
     –   No Notifications (Floodway, BFE/SFHA)
     –   No Annotated FIRM
     –   Tie-ins – Profile, SFHA, and Floodways
     –   Missing Community Acknowledgement
          •   Multiple Community LOMRs
          •   Corporate Limit Changes
     – Topographic Information
          •   Not legible
          •   Not extensive enough
          •   No (or incorrect) vertical datum
    Common CLOMR/LOMR                                                  Flood Map
                                                                       Modernization
    Submittal Problems

•    Most Common Submittal Problems
     – No (or incorrect) duplicate effective model
     – Map and Model do not match
     – No background information provided
         •   If structures, coefficients, drainage areas, etc. change from the
             effective – the source and reason for change should be documented
    Common CLOMR/LOMR                                                     Flood Map
                                                                          Modernization
    Modeling Problems

•    Most Common Modeling Problems
     – Extended cross sections
         •   Water surface elevation higher than the end points of the cross
             section
     – Mixed or supercritical flow used
     – Floodway surcharges outside acceptable range
     – Incorrect structure modeling
         •   Location of cross sections
         •   Modeling methods/Coefficients
     – No explanation for critical flow depth
    Common CLOMR/LOMR                                                  Flood Map
                                                                       Modernization
    Modeling Problems

•    Most Common Modeling Problems
     – Ineffective flow areas
         •   Not used
         •   Used incorrectly
     – Split flow not modeled
         •   Can have large variations of flow between channel and overbank
             with no hydraulic connection
     – Cross sections not spaced properly
         •   Accounting for large changes in conveyance
                                                                     Flood Map
    Zone A CLOMR/LOMR                                                Modernization




•    Zone A
     – Areas with no BFE determined
     – Some Zone A delineations are backed by a detailed study
     – Most are not
•    Differences btw Zone A and Zone AE
     – If no Effective Model:
         •   Existing Conditions model is the first model created
         •   There is no requirement to tie-in to a profile
         •   Only the 100-yr profile is required
     – Tie-ins to effective FIRM can be difficult
         •   May have to extend the study upstream and/or downstream of
             project
                                           Flood Map
Zone A CLOMR/LOMR                          Modernization




                   Property
                   Boundary




  Effective FIRM              Annotated FIRM
    Working with Multiple                                                   Flood Map
                                                                            Modernization
    Hydraulic Models

•    Effective Hydraulic Model
      – The hydraulic analysis used in the effective FIS
•    Duplicate Effective Hydraulic Model
      – A copy of the effective model reproduced on the requestors
        computer
      – Should not be modified – unless required to allow model to run
          •   Adding distance from upstream XS to bridge
      – If the effective model is not available:
          •   New model calibrated to reproduce the FIS profile within 0.5 ft
    Working with Multiple                                                  Flood Map
                                                                           Modernization
    Hydraulic Models

•    Corrected Effective Model
      –   Corrects errors in the duplicate effective
      –   Adds cross sections
      –   More detailed topography
      –   Must NOT reflect man-made changes since the date of the
          effective model
•    Existing Conditions Model
      – Modified version of the Duplicate or Corrected Effective model
      – Includes any modifications since the date of the Effective
      – If no modifications since the effective:
           •   The Duplicate Effective or Corrected Effective becomes the Existing
               Conditions
    Working with Multiple                                   Flood Map
                                                            Modernization
    Hydraulic Models

•    Post-Project Conditions Model
      – Modified version of the Existing Conditions model
      – Includes modifications to reflect the project
    Working with Multiple                                                 Flood Map
                                                                          Modernization
    Hydraulic Models

•    Why all the models?
      – Comparisons
•    Effective FIS data vs. Duplicate Effective
      – Should match within 0.1 foot at all locations
          •   0.5 ft if effective model is not available
      – Ensures:
          •   The correct model is being used
          •   The data was transferred correctly to the requestor’s equipment
          •   Revised data integrated into effective
    Working with Multiple                            Flood Map
                                                     Modernization
    Hydraulic Models

•    Duplicate Effective/Corrected Effective vs. Existing
      – How do they compare?
      – Are there any potential violations
•    Existing vs. Post Project
      – What are the true impacts of the project
•    Effective vs. Post Project
      – Impact on the FIRM and FIS
      – Adverse impact notification
                                                                     Flood Map
    Bridge/Overbank Modeling Example
    Bridge/Overbank                                                  Modernization




•    Bridge Example
      – Flow overtops the roadway of a bridge in the overbank
      – Downstream of the bridge HEC-RAS shows that the flow is
        contained in the channel
      – There is no physical way for all the flow to get to the channel
•    Overbank Example
      – An upstream XS shows flow in the overbank
      – The downstream XS shows flow contained in the channel
      – There is no physical way for all the flow to get to the channel
                                                 Flood Map
  Bridge/Overbank Modeling Example
  Bridge/Overbank                                Modernization




                               US Cross Section (BA)




Zone AO used to map overbank
   DS of cross section BA         DS Cross Section
                                           Flood Map
    Bridge/Overbank Modeling Example
    Bridge/Overbank                        Modernization




•    Potential Solutions
      – Confirm that modeling is correct
          •   XS location
          •   Coefficients
          •   Bridge modeling techniques
      – Model as a split flow
      – Model as a shallow flooding area
                                                                   Flood Map
    Uncertified Levee Example                                      Modernization




•    Levee Definition
      – A man-made structure designed to contain, control, or divert the
        flow of water so as to provide protection from temporary flooding.
•    Levee Policy
      – Natural berms or points of high ground are not considered
        levees.
      – Any manmade embankment, regardless of width, which if
        removed would result in the inundation of the landward
        properties, is a levee and subject to the requirements of Section
        65.10.
      – This interpretation has been consistently applied over the years
        and was taken, from a special response that was mailed by
        FEMA as far back as 1993.
Uncertified Levee Example    Flood Map
                             Modernization
Work map and HEC-RAS Model
               HEC-RAS
                                                                 Flood Map
    Uncertified Levee Example                                    Modernization




•    Modeling an Uncertified Levee
      – Levee does not meet the requirements of Section 65.10
      – Hydraulic model should include a with and without levee scenario
•    Mapping an Uncertified Levee
      –   Gutters placed at the location of the levee
      –   BFE from with levee scenario - mapped on riverward side
      –   BFE from without levee scenario – mapped on landward side
      –   Multiple profiles are plotted
      –   Floodway data table lists multiple elevations
Uncertified Levee Example   Flood Map
                            Modernization
FIRM and FIS
                                         Flood Map
LOMR Workshop Overview                   Modernization




 • Introduction
 • Applicable NFIP Regulations
 • LOMR Examples
 • Data Required/Completing MT-2 Forms
 • Common LOMR Problems and Examples
   The FEMA Review Process
    – Review Timeline
    – LOMR/CLOMR Review Process
    – Finishing a Review

 • Conclusion and Questions
                                                                  Flood Map
    Review Timeline                                               Modernization




•    Notification
      – FEMA required to notify requestor and community as to adequacy
        of submittal within 90 days
•    Completion
      – FEMA required to provide requestor and community with LOMR,
        CLOMR, or other written comment within 90 days of receipt of all
        data
                                                                      Flood Map
    Roles in the Review Process                                       Modernization




•    Technical Review of Request
      – Michael Baker Jr., Inc. – All FEMA regions except the Urban
        Drainage and Flood Control District
          •   Reviews for FEMA Regions 8 and 10 are completed in the Lakewood
              office
      – UDFCD – All revision requests in the Urban Drainage and Flood
        Control District
          •   ICON Engineering, Inc. is the UDFCD review contractor

•    Final Review and Signature
      – FEMA Headquarters
•    Technical assistance and violation resolution
      – FEMA Regional Offices
                          Flood Map
The FEMA Review Process   Modernization




                          Note: If Data Rec’d,
                          review timeline
                          starts over.
                                                 Flood Map
    Initial Data Review                          Modernization




•    Do we have enough data to complete a detailed
     review?
•    Common Items Checked:
      – Fee
      – MT-2 Forms
           •   Including required signatures
      –   Community Ack.
      –   Models and Backup
      –   Maps
      –   Notifications
      –   Tie-in to effective
                                                                Flood Map
    Detailed Data Review                                        Modernization




•    Common Items Checked:
      – Technical review of H&H
      – H&H compliance with the Guidelines and Specifications
          •   http://www.fema.gov/fhm/gs_main.shtm
      – Map and Model agreement
      – Potential violations
                                                                    Flood Map
    Technical Review of Hydrology                                   Modernization




•    Basic Information
      –   Reason for new hydrology
      –   Methodology
      –   Existing/future conditions
      –   Comparison to existing studies, regression analysis, and or
          similar basins
•    Detailed Information
      –   Methodology appropriate
      –   Methodology correctly applied
      –   Source of input parameters
      –   Input parameters correct
      –   Any missed impacts
                                                                     Flood Map
    Technical Review of Hydraulics                                   Modernization




•    Basic Information
      –   Methodology
      –   Are the discharge rates correct?
      –   Is flow regime subcritical
      –   Starting water surface method
•    Cross Sections
      –   Source of geometry data and datum
      –   Is the datum the same as the effective FIS
      –   Channel lengths
      –   XS spacing and alignments reasonable
      –   XS geometry matches work map
      –   Coefficients reasonable (Mannings, Exp/Cont)
      –   Ineffective flow areas/blocked obstructions used appropriately
                                                                     Flood Map
    Technical Review of Hydraulics                                   Modernization




•    Bridges and Culverts
      –   Source of geometry data and datum
      –   Is the datum the same as the effective FIS
      –   Does structure geometry match survey or as-built info
      –   XS spacing correct
      –   Ineffective flow areas/blocked obstructions used appropriately
      –   Modeling approach and coefficients reasonable
•    Other Hydraulic Structures
      – Modeling method. Reasonable?
                                                      Flood Map
    Technical Review of Hydraulics                    Modernization




•    Results
      – Floodway
           •   Equal encroachments
           •   Acceptable surcharges
           •   Delineation makes sense
      –   Profiles reasonable
      –   XS results reasonable
      –   Unusual error messages
      –   Defaults to critical
      –   Any calibration data used (not necessary)
    Technical Review of Hydraulics                              Flood Map
                                                                Modernization
    and Work Map


•    Results
      –   Do models tie-in with in 0.5 ft
      –   Does floodplain and floodway tie-in
      –   Do the floodplain top widths match between map and model
      –   Do the floodway top widths match between map and model
      –   Does the delineation make sense
                                                 Flood Map
    Finishing a Review                           Modernization




•    Complete the technical review
•    Prepare the determination documents and cover
     letter
•    Prepare the annotated map attachment
•    Prepare the annotated FIS attachment(s)
      – Profiles
      – Tables
•    Send package to FEMA HQ for final review and
     signature
                                 Flood Map
     Creating Annotated Maps     Modernization




                      Work Map

Effective
FIRM
                                 Annotated
                                    FIRM
                                   Flood Map
     Creating Annotated Profile    Modernization




                         Model
                         Results
Effective                             Annotated
Profile                                 Profile
                                                                                     Flood Map
When is my LOMR Effective                                                            Modernization




•   LOMRs

          Revision Type                 Circumstances                    Effective Date
    SFHA and/or BFEs Decrease   None                              Effective on Date of LOMR
                                Property owner notification and
    SFHA and/or BFEs increase   acceptance, community has         Effective on Date of LOMR
                                compliant ordinances
                                Property owner notification, no
                                                                  Effective 30 days after Date
    SFHA (only) increase        acceptance, community has
                                compliant ordinances              of LOMR
                                Property owner notification, no
                                                                  Effective after 90 day appeal
    SFHA and/or BFEs increase   acceptance, community has
                                compliant ordinances              period elapses
                                Property owner notification, no   Effective 6 months after Date
    SFHA and/or BFEs increase   acceptance, community does not    of LOMR
                                have compliant ordinances
                                         Flood Map
LOMR Workshop Overview                   Modernization




 • Introduction
 • Applicable NFIP Regulations
 • LOMR Examples
 • Data Required/Completing MT-2 Forms
 • The FEMA Review Process
 • Common LOMR Problems and Examples
   Conclusion and Questions
                                                                           Flood Map
    Contact Information                                                    Modernization




•    Revisions Managers
      –   FEMA Regions 8 and 10 (Excludes UDFCD)
           •   Jennifer Winters – Michael Baker Jr., Inc. – 720.514.1107
      –   Urban Drainage and Flood Control District
           •   Bill DeGroot and David Mallory – UDFCD – 303.455.6277
           •   Craig Jacobson – ICON Engineering, Inc. – 303.221.0802
•    Amendments Manager
      –   FEMA Regions 8, 9, and 10
           •   Steve Graham – Michael Baker Jr., Inc – 720.514.1104
•    FEMA Region 8 State Contacts – 303.235.4800
      –   CO – Dan Carlson
      –   MT – Marijo Camrud
      –   ND – Simon Cardenas
      –   SD, UT – Barb Fitzpatrick
      –   WY – Bonnie Heddin
                             Flood Map
    Questions                Modernization




•    Questions and Wrap Up