Base Flood

Base Flood

• Base Flood

• Is the NFIP Flood of Regulation for Floodplain Management (Defined as the flood that has a 1% chance of being equaled or exceeded in a given year).

• Special Flood Hazard Area (SFHA)

• Areas subject to the 1%, or Greater, annual chance of flooding in any given year. (Aka – the “100-Yr” Floodplain).

• Base Flood Elevation (BFE)

• Water surface elevation resulting from the Base Flood (Aka – the “100-Yr” Elevation) that is tied into a known vertical datum.

1% Annual Chance -Vs.- “100-Yr” Language

• 1% Annual Chance -Vs.- “100-Yr” Language

• Unfortunately, “100-Yr” Flood terminology has an attached mental picture of taking 100 years between flooding events.

• However, it needs to be thought of as a raffle instead, all based on Odds.

• Picture a bag with a hundred marbles with one being a different color. Every time it begins to rain reach your hand inside the bag and choose a marble. If you get the odd colored marble, that would be same chance of having a 1% flooding event.

Floodway

• Floodway

• Means the Channel of the Watercourse and the adjacent overbank land areas that must be reserved in order to discharge the Base Flood Elevation without cumulatively increasing the water surface elevations more than a designated amount. (This is 1-Foot in MO)
• Sometimes referred to as the “Regulatory Floodway”.

Floodway (cont.)

• Floodway (cont.)

• Once FEMA defines a Floodway for a particular stream reach, then what was the entire 1% floodplain, has now been divided into what is called the Floodway & the Floodway Fringe.
• The Floodway Fringe has the same development requirements as the 1% Floodplain.
• However, the Floodway has more restricted development standards.

Floodway (cont.)

• Floodway (cont.)

Structure

• Structure

• For Floodplain Management Purposes Means:
• A walled and roofed building, including gas or liquid storage tanks, this is principally above ground, as well as manufactured homes (trailers or Modular structures).
• Sometimes referred to as “Four Walls & a Roof”.
• There are two (2) other definitions for Structures that are used on the Insurance Side of the NFIP.

Lowest Floor

• Lowest Floor

• Means the top of the lowest enclosed area, including basements & crawlspaces, that has a finished or unfinished surface.
• Lowest Floor is not Always the Lowest Floor.
• When there is an enclosed area below BFE, that is made with flood resistant materials, used solely for parking, access to the building, limited storage, and all utilities & machinery is elevated above the BFE, with the required openings, and it is not considered to be a FEMA defined basement, then the compliance and rating floor would be the next higher floor elevation.

Freeboard

• Freeboard

• Is the designated height above the existing BFE to which Structures & Levees must be elevated or constructed.

• Freeboard Accounts for:

• The 1-foot rise in BFE’s if the Floodway Fringe is completely filled.
• Effects of upstream development.
• Unexpected backwater due to debris or Ice.
• And Uncertainties in the modeling & topography.

Flood Hazard Boundary Map (FHBM)

• Flood Hazard Boundary Map (FHBM)

• Flood Insurance Rate Map (FIRM)

• Flood Boundary & Floodway Map (FBFM) or just referred to as the “Floodway Map”

• Digital Flood Insurance Rate Map (DFIRM)

• FIRMette

There are several different FEMA Maps that are referred to as “FIRM”.

• There are several different FEMA Maps that are referred to as “FIRM”.

• Converted FIRM (Previous Slide)
• FIRM Only
• FIRM & FLOODWAY (Separate Maps)
• FIRM & FLOODWAY (Same Map)
• DFIRM (Usually includes Floodway Information and provide in a “County-Wide” Format)

FIRM & Separate FLOODWAY Map:

• FIRM & Separate FLOODWAY Map:

• The First Floodway Maps were printed separately from the Community’s FIRM maps.
• Floodway Concept not part of Original 1968 National Flood Insurance Act.
• Floodplain on two separate maps not was not a good idea.
• Doubles FEMA’s Printing Costs.
• FLOODWAY map not always used for floodplain development reviews by Local Community.

DFIRM Map:

• DFIRM Map:

• Usually in “County-Wide” format.
• Usually has an Aerial Photograph background.

The FIS is a presentation of the Hydrologic and Hydraulic (H&H) determinations made for the specific watercourses within a given Community.

• The FIS is a presentation of the Hydrologic and Hydraulic (H&H) determinations made for the specific watercourses within a given Community.

• This Includes:

• Estimating the Flow Frequencies (Hydrology).
• Provides the Stream Elevation Profiles (Hydraulics).
• Floodway Data (if Calculated).
• Establishes the Insurance Risk Zones.

The FIS also contains information about the Horizontal & Vertical Datum used during the Study.

• The FIS also contains information about the Horizontal & Vertical Datum used during the Study.

• Provides information about FEMA’s Study Contractor who performed the Analysis.

• Could be important later since FEMA has been know to misplace study data.

Floodway Data Table (FDT):

• Floodway Data Table (FDT):

Stream Profiles:

• Stream Profiles:

Step 3 – Identify Specific Location

• Step 3 – Identify Specific Location

Step 4 – Is Site is in the Floodplain?

• Step 4 – Is Site is in the Floodplain?

Step 5 – Is Site is in the Floodway?

• Step 5 – Is Site is in the Floodway?

Step 7 – Determine the BFE

• Step 7 – Determine the BFE

Step 7 – Determine the BFE

• Step 7 – Determine the BFE

Because of the Legal Significance, “Due Process” Procedures, and the many various NFIP Document Users, information supporting Map Revisions MUST be Scientifically & Technically Accurate.

• Because of the Legal Significance, “Due Process” Procedures, and the many various NFIP Document Users, information supporting Map Revisions MUST be Scientifically & Technically Accurate.

• There are Two (2) Type of Requests:

• Request that DO NOT change the Published BFE’s, Floodplain Boundaries, or Floodway.
• Request that DO change the Published BFE’s, Floodplain Boundaries, or Floodway.

Amendments –Vs.– Revision

• Amendments –Vs.– Revision

• Amendments can be thought of as a “Correction”.

• Revisions can be thought of as a “Change”.

• Amendments:

• Usually involves Structures or Parcels, do not involve detailed H&H analysis, and does not change the Map.

• Revisions:

• More Complex, requires detailed surveys, H&H analysis and will physically change the Published Map.

Amendments are either:

• Amendments are either:

• Letter of Map Amendments (LOMA) or
• Letter of Map Revisions – Based on Fill (LOMR-F).

• LOMA’s removed Structures or Parcels of Land that has NOT been Elevated by the placement of Fill.

• LOMR-F’s removed Structures or Parcels of Land that HAVE Been Elevated by the placement of Fill.

Amendments (LOMA’s) reflect the “Pre-Existing” FIRM Conditions where Structures or Parcels were “Inadvertently Included” within the SFHA.

• Amendments (LOMA’s) reflect the “Pre-Existing” FIRM Conditions where Structures or Parcels were “Inadvertently Included” within the SFHA.

• Usually they are located within an Approximate Study Areas (Unnumbered A-Zones).
• These Errors typically occur due to the limitations of the base map data.
• The 10 foot or 20 foot contour intervals developed for USGS 7.5 Minute “Quad” maps was used for most County FIRM’s.

The Amendment Removal Process is governed by Part 70 of the 44 CFR.

• The Amendment Removal Process is governed by Part 70 of the 44 CFR.

• Amendments can be submitted for Single Structures or Parcels and for Multiple Structures or Parcels.

• Conditional LOMA’s (CLOMA) can also be Requested.

• Conditional Requests are based on Proposed Conditions and only provides FEMA’s opinion for your project, it is not a Removal.

Revisions Based on Fill (LOMR-F) typically involve changes that have occurred to a parcel of land located in the SFHA since the FIRM became Effective (Man-Made Post-FIRM Conditions).

• Revisions Based on Fill (LOMR-F) typically involve changes that have occurred to a parcel of land located in the SFHA since the FIRM became Effective (Man-Made Post-FIRM Conditions).

• Specifically the addition of Fill to a parcel or parcels of land that elevates the existing ground elevations “to or above” the BFE.
• These requests Requires Community Approval for FEMA to Remove them.

Community Approval for LOMR-F request is Accomplished through the completion of the Community Acknowledgement Form.

• Community Approval for LOMR-F request is Accomplished through the completion of the Community Acknowledgement Form.

• The requirements of the Community Acknowledgement form change significantly on June 4, 2001.

• Prior to the change, Communities only acknowledged that:

• Fill is being placed in the Floodplain and
• It is NOT being placed in the Floodway

After the revision to the procedures, Communities are now also certifying, that the item being removed is:

• After the revision to the procedures, Communities are now also certifying, that the item being removed is:

• “Reasonable Safe from Flooding”

• “Reasonable Safe from Flooding” means: “base flood waters will not inundate the land or damage structures to be removed from the SFHA and that any subsurface waters related to the base flood will not damage existing or proposed buildings.”

FEMA has provided three (3) documents to assist Communities in making this Determination.

• FEMA has provided three (3) documents to assist Communities in making this Determination.

• The Published Final Rule Change that became effective on June 4, 2001.
• Technical Bulletin 10-01 titled “Ensuring That Structures Built on Fill In or Near Special Flood Hazard Areas Are Reasonably Safe From Flooding”.
• Procedure Memorandum No. 22

• All three Documents are included in your packet.

LOMR-F can be submitted for Single Structures or Parcels and for Multiple Structures or Parcels.

• LOMR-F can be submitted for Single Structures or Parcels and for Multiple Structures or Parcels.

• Conditional LOMR-F’s (CLOMR-F) can also be Requested.

• Once again these conditional Requests are based on Proposed Conditions and only provides FEMA’s opinion for your project (not a Removal).
• Can be good practice for large developments.

Individuals wanting to remove Structures or Parcels from the SFHA need to complete the appropriate MT (mitigation) Package Form. They are:

• Individuals wanting to remove Structures or Parcels from the SFHA need to complete the appropriate MT (mitigation) Package Form. They are:

• Mitigation Form Package Easy (MT-EZ).
• Double-Sided single page form.
• Mitigation Form Package One (MT-1).
• Property Information Form.
• Elevation Information Form.
• Community Acknowledgement Form.
• Payment Form.

MT-EZ can only be used for:

• MT-EZ can only be used for:

• Residential Single Parcel or Single Structure LOMA’s.

• MT-EZ cannot be used for:

• Multiple Requests.
• Requests Based on Fill.
• Conditional Request or
• Request to Physically change the FIRM.

• Current MT-EZ form expires on September 30, 2010.

MT-1 can be used for:

• MT-1 can be used for:

• Single Parcel or Structure & Multiple Parcel or Structure requests.
• Requests Based on Fill (LOMR-F).
• Conditional Requests (CLOMA or CLOMR-F).
• Non-Residential Parcels and Structures.

• MT-1 cannot be used for:

• Request to Physically change the FIRM.

• Current MT-1 forms expired on June 30, 2007 but has been extended until the new form is available.

The MT-EZ and MT-1 Forms are available online at FEMA’s NFIP forms homepage:

• The MT-EZ and MT-1 Forms are available online at FEMA’s NFIP forms homepage:

• www.fema.gov/plan/prevent/fhm/frm_form.shtm

• The NFIP forms homepage is where you will also find the digital copies of the Elevation & Floodproofing Certificates.

• Forms can also be obtained by calling 877-FEMA-MAP (1-877-336-2627).

• Or by Calling SEMA (1-573-526-9115)

Revisions that physically Change the Effective or Revised Map are either:

• Revisions that physically Change the Effective or Revised Map are either:

• Letter of Map Revisions (LOMR) or
• Physical Map Revisions (PMR).

• Most submitted LOMR’s are processed as a LOMR but occasionally FEMA will “upgrade” the LOMR to a PMR.

• LOMR’s are needed to incorporate Post-FIRM development changes into the FEMA defined SFHA.

LOMR’s need to be submitted for Changes or Developments that:

• LOMR’s need to be submitted for Changes or Developments that:

• Physically change to the watercourse or floodplain boundaries due to development or natural forces.
• To incorporate better technical data into your existing study (topographic data for example).
• To correct known FEMA study errors.
• To provided better hydrologic or hydraulic methodology to FEMA.

There is also a Conditional LOMR (CLOMR) process.

• There is also a Conditional LOMR (CLOMR) process.

• Unlike Amendments, there are two (2) circumstances where the 44 CFR requires a CLOMR’s to be submitted before a LOMR can be issued:

• If the proposed changes are going to increase existing BFE’s by more than 1-foot or
• If a FEMA defined Regulatory Floodway is going to be altered.

The CLOMR process allows property owners, developers, communities, and regional agencies to obtain verification from FEMA of the affects of a proposed development might have on the flood hazards shown on the effective FIRM.

• The CLOMR process allows property owners, developers, communities, and regional agencies to obtain verification from FEMA of the affects of a proposed development might have on the flood hazards shown on the effective FIRM.

• Required because of the Legal Significance and Due Process issues associated with the NFIP related documents discussed earlier.

Elevation Certificates DO NOT:

• Elevation Certificates DO NOT:

• Change Flood Insurance Risk Zones on the FIRM.
• Are not LOMA’s or LOMR-F’s.
• Do not waive Federal Mandatory Purchase Requirements.

• Only FEMA with Community Approval can Revised the Effective Map.

• LOMA’s & LOMR’s are Valid until the Map is Revised.

• LOMA’s may be revalidated on the Summary of Map Amendment (SOMA) Document.
• LOMR’s should be Incorporated into the new Map.

Several Tutorials are available on line at:

• Several Tutorials are available on line at:

• www.fema.gov

• FEMA tutorial Homepage is located at:

• www.fema.gov/plan/prevent/fhm/ot_main.shtm

• Using FEMA Map Tutorial is located at:

• www.fema.gov/plan/prevent/fhm/ot_firmr.shtm

• Elevation Certificate Tutorial is located at:

• http://training.nfipstat.com/ecsurveyor

Copies of FEMA FIS’s, FIRM’s, and DFIRM’s can be viewed & ordered from the Map Service Center (MSC) at:

• Copies of FEMA FIS’s, FIRM’s, and DFIRM’s can be viewed & ordered from the Map Service Center (MSC) at:

• http://msc.fema.gov

• The MSC can also be reached by calling:

• 800-358-9616

• MT-EZ & MT-1 Questions can be direct to:

• 877-FEMA-MAP (877-336-2627)

MT-2 Questions can be submitted by email directly to the “Ask the Expert” Link at: [e-mail]

• MT-2 Questions can be submitted by email directly to the “Ask the Expert” Link at: [e-mail]

• Mapping Information Platform (MIP) is at: http://hazards.fema.gov/femaportal.wps/portal

• Letter of Map Change Status is at:

• www.fema.gov/plan/prevent/fhm/st_main.shtm

• NFIP Forms Homepage is at:

• www.fema.gov/plan/prevent/fhm/frm_form.shtm

FEMA Region VII includes the States of Iowa, Kansas, Missouri & Nebraska.

• FEMA Region VII includes the States of Iowa, Kansas, Missouri & Nebraska.

• The Mitigation Specialist for the State of Missouri:

• Connie Wisniewski, CFM

• 9221 Ward Parkway, Suite 300

• Kansas City, MO 64114-3372

• 816-283-7013