What Was Updated in 2004 in Hennepin Countywide Maps?

Transcription

1 What Was Updated in 2004 in Hennepin Countywide Maps? Combined the city and township maps into one countywide index Done by USACE Mainly digital capture of old floodplain boundaries; some spots with shifts Old microstation digital layer A few areas where communities provided updated boundaries and/or data

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3 Flood Risk Assessment Methods Evolving... Yesterday Today Tomorrow

4 FEMA Map with Special Flood Hazard Area National Standard of 100-year flood chosen High Flood Risk Medium Flood Risk Low Flood Risk 4 Zone A & AE (old) Zone A & AE (new) Zone B (old maps) Zone X (shaded) Zone C (old maps) Zone X (unshaded)

5 Changes for 2016 Update New digital Flood Insurance Rate Map (DFIRM) New official floodplain digital layers Mainly digital capture Updates: Minnehaha Creek, Nine Mile, Crow River, incorporating other bigger past updates (Letters of Map Revisions, or LOMRs) Will be on FEMA s National Flood Hazard Layer (official) viewer as of 11/4/2016 Future LOMRs shown in FEMA s viewer

6 FEMA NFHL Viewer

7 Updates Not Included Boundaries not redrawn using LiDAR Many A Zones where the flood elevation is not determined Last minute corrections LOMRs to be effective on 11/5/2016 Six Mile Creek panels 287 & 290 Ox Yoke panels 257 & 276 Long Lake Creek

8 Sample LOMR in DFIRM

9 LOMA Letter of Map Amendment A letter from FEMA stating that an existing structure or parcel of land that has not been elevated by fill would not be inundated by the 100-year flood The FEMA map is wrong better topographic contour lines or a field survey shows site is above BFE

10 LOMA Natural Grade Lowest Adjacent Grade (LAG) BFE

11 LOMR-F Diagram Part 65 of the NFIP Regulations requires that the following be equal to or higher than the BFE: the lowest ground touching the structure; and For existing structures, the lowest floor (including basement or crawl space) (this also means that the community certifies the structure is complaint with Section 60.3 of the NFIP regulations)

12 LOMR-F Fill BFE

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14 Specifics for Minnetrista Updates along Painter Creek LOMRs for Six Mile & Ox Yoke (being done by FEMA contractor no city action needed) Will have mainly digital conversion so be ready for assisting many with LOMAs Consider better data LOMR

15 What Do Changes Mean for City & Citizens City must update or amend floodplain management ordinance (effective by 11/4/16) Before 11/4/16: - Any newly mapped structures? Advise now so they can get cheaper flood insurance - Closer to 11/4/16 Advise owners with floodplain in parcel (separate in & out as shown letters - 10/12 meeting for city staff to learn about: Mapping resources Steps to help citizens

16 Newly Mapped Rates

17 New Floodplain Areas

18 New map dated 11/16/11 Within 45 days!! If citizen gets letter from bank, advise them to act quickly: Verify if structure s in Zone A(AE) See if eligible for LOMA or LOMA- OAS Get NFIP flood insurance if they can t resolve within 45 days or lender will/can force place insurance that is not NFIP.

19 FAQs from Public with New Maps Am I in the floodplain? Look at FEMA map (or Hennepin Co site) and see if their building is in the 1% annual chance area If the building is out as shown on the new map, they can usually just show lender the better map If the bank wants something from FEMA, apply for Letter of Map Amendment Out as Shown (LOMA-OAS)

20 Out as Shown on FEMA map In even if actually high

21 Find Current Effective Map New Look as of December Enter address or city or county here

22 If DFIRM (starting 11/4/16 in Hennepin County), will have this icon to link to FEMA s National Flood Hazard Data (NFHL) viewer

23 Zooms to that address at FEMA s National Flood Hazard Layer (Official) viewer (address should be centered)

24 Click on purple dot to see LOMA document

25 Print from FEMA NFHL Viewer

26 DFIRM FIRMette brand new!

27 IF Better Aerial in Overlay Shows Out Show to lender. Some will accept the better data. Some lenders will still insist on getting Letter of Map Amendment (LOMA) from FEMA Would be eligible for cheaper policy in meantime.

28 Hennepin Interactive Natural Resources Map

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30 Options if Shown In Is there a valid LOMA or LOMR-F? - Show copy of that to lender Does city have as built elevations? - If built after about 9/27/1985, city should have elevation documentation Do 2-foot contours show they are clearly high? - Apply for LOMA using 2-foot contours from LiDAR

31 5/4/16 Letter of Final Determination Attached: Final Summary of Map Actions

32 Addressed to mayor Revalidation Letter Effective day after new map date Revalidated LOMAs & LOMR-Fs

33 930.9 ft

34 s/naturalresources/m ap/default.aspx

35 930.9 ft

36 s/naturalresources/m ap/default.aspx

37 Assistance with LOMAs DNR working with Hennepin County staff on map that FEMA will accept when 2-foot contours show high If house appears above, but not eligible for LOMA using LiDAR, will need to hire surveyor If the map does not show the base flood elevation, the watershed districts and / or DNR can help provide an estimate to use

38 In Anoka County Anoka County GIS staff prepared map app that can be used by local officials and other professionals (surveyors, engineers) mn.gov/flood/ Nice features that others may want to use in their templates (i.e., disclaimer notes FEMA BFE and local regulation elevations different, still floods above BFE, etc.)

39 Questions?