981 2015 11 20 Floodplains s.pdf
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(2) Topics Background/history Purpose of flood maps MDFloodmaps.com Next steps Resources/Questions. Know Your Risk. Insure Your Risk. Reduce Your Risk.
(3) National Flood Insurance Program (NFIP) Created in 1968 Administered by FEMA Voluntary program Partnership between the. Federal government and the community (County or municipality) Three main parts: mapping, regulations and insurance.
(4) MDE’s Role NFIP State Coordinating Office Provide technical assistance on regulatory requirements Assist communities with public outreach and floodplain management ordinance updates Cooperating Technical Partner (CTP) with FEMA on. floodplain mapping Regulate activities in the 100-year nontidal floodplain Waterway Construction Permit.
(5) Washington County’s Role Participating community in the NFIP Flood insurance available to homeowners, business owners and renters (doesn’t matter if structure is located in or out of the mapped floodplain) Agreed to adopt and enforce a floodplain management. ordinance. Based on Flood Insurance Rate Maps (FIRMs), and. associated Flood Insurance Study (FIS). Use FIRMs and FIS for “development” review process.
(6) Washington Co. NFIP Communities CID. Community. Date Joined. 240071. Town of Boonsboro. 7/16/1980. 240072. Town of Clear Spring. 4/17/1985. 240073. Town of Funkstown. 2/1/1978. 240074. City of Hagerstown. 4/17/1978. 240109. Town of Hancock. 2/17/1982. 240075. Town of Keedysville. 1/2/1980. 240076. Town of Sharpsburg. 1/2/1980. 240124. Town of Smithsburg. 6/6/2001. 240070. Washington County. 5/1/1978. 240077. Town of Williamsport. 6/10/1977. Data Source: FEMA Community Status Book (CSB).
(7) Flood Insurance Rate Map (FIRM) An official map on which FEMA delineated special flood. hazard areas to indicate the magnitude and nature of flood hazards, to designate applicable flood zones, and to delineate floodways, if applicable. FIRMs prepared in a digital format or converted to a digital format are referred to as Digital FIRMs (DFIRM). National standard is the 1% annual chance flood (also known as the “100-year flood”) Flood insurance rating Local floodplain management & development review process. Flood Insurance Study (FIS) key piece of information.
(8) Flood Insurance Study (FIS) Revised preliminary issued. on March 31, 2015 Contains nine sections: . Introduction Area Studied Engineering Methods Floodplain Management Applications Insurance Applications Flood Insurance Rate Map Other Studies Location of Data Bibliography and References.
(9) Digital FIRM (DFIRM) Accessible in a variety of digital formats: GIS layers Google Earth PDFs Map viewers, etc. Websites:. Maryland DFIRM Outreach Program www.mdfloodmaps.com FEMA Map Service Center (MSC) www.msc.fema.gov.
(10) Limitations of FIRMs/DFIRMs Doesn’t show where all flooding can occur Floods don’t follow map boundaries State can regulate beyond the FEMA-mapped floodplain Doesn’t take into account future conditions Based on current and historical data.
(11) Flood Risk Zones Risk. Zone. Low. X (unshaded). Moderate. X (shaded). High (Riverine/tidal)*. A, AH, AO, AE. High (Coastal)*. VE. *Mandatory purchase requirements for flood insurance, and regulatory requirements in high risk areas.
(12) Zone AE – Crisfield.
(13) Zone VE – Calvert Co..
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(15) www.mdfloodmaps.com.
(16) Flood Risk Application.
(17) Flood Risk Application.
(18) Flood Risk Application.
(19) www.msc.fema.gov.
(20) Example of FIRMette.
(21) Interagency Collaboration. Hydrology Panel – Application of Hydrologic Methods in Maryland Hydraulics Panel –. Standardization of Bridge/Culvert Modeling; Sharing information. Maryland Emergency Management Agency – Hazus upgrades to include building specific and critical facilities Maryland Environmental Service/West Virginia GIS Technical Center – Sharing Source Code U.S. Fish & Wildlife – Watershed Resources Registry – Stream Stability Index Model Maryland Historical Trust – Mapping/Protecting Historic Properties.
(22) Changing the Culture Stove pipe approach needs to be eliminated.
(23) Georeferenced Floodplain Models.
(24) Georeferenced HEC-RAS.
(25) MDE Terrain Data.
(26) MDE Terrain Data.
(27) Floodplain Generation in GIS ●. Water Surface extracted from RAS. ●. Water Surface Intersected with Terrain. ●. If Water Surface Elevation > Ground Elevation, a floodplain is mapped. ●. Difference between surfaces is a depth grid.
(28) MD Structure Inventory . Stream Crossing Survey ► ► ► ► ► ►. . Relative dimensions Structure material Piers Entrance parameters Photographs Control channel. Bridge Viewer.
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(30) MDFloodmaps.com.
(31) MDFloodmaps.com.
(32) MDFloodmaps.com. Through the carousel, you can access Geo – Hec-Ras Models for download and use.
(33) Where can I get data? MDFloodmaps.com • Approximate Cross Sections • HEC-RAS Models. FEMA MSC • Depth Grids • Water Surface Elevations.
(34) Schedule Revised Preliminary FIRMs/FIS issued in March 2015 Anticipated effective date Winter 2016 (depends on. issuance of Letter of Final Determination).
(35) Using Enhanced Risk MAP Products to Increase Resilience • Depth Grids and other enhanced, non-regulatory datasets provide an opportunity to develop more accurate loss estimation and Benefit Cost Analysis (BCA) for mitigation projects, a big step towards implementation.
(36) What is an ‘Enhanced’ Analysis • Leverage the best available data, and past. investments from state and local sources, including: • High resolution terrain data • Depth grids based on Risk MAP DB • Local building footprints, parcel centroids, and other. - used to compile a User-Defined Facility (UDF) Inventory. C.
(37) MD Flood Risk Tool Supports eLOMAs! • Now accepted for MD approximate areas! • eLOMAs = Instant printable determination. If audited and passes audit takes about 5 business days. If audit fails it goes into regular LOMA process. • Online LOMC Tool – 30-60 days but saves in mailing times. May save up to 15 business days vs paper submission. • Paper MT-EZ and MT-1 submissions – 30-60 days • ***These times imply all necessary data is supplied to complete the application..
(38) Online Resources Maryland DFIRM Outreach Program. www.mdfloodmaps.com FEMA Map Service Center (MSC) www.msc.fema.gov FEMA Region III Flood Risk MAP www.riskmap3.com National Flood Insurance Program (NFIP) www.FloodSmart.gov.
(39) Questions? Kevin Wagner, Natural Resources Planner Maryland Department of the Environment 301-689-1495 [email protected] Mark Stransky, Sr. Plan Reviewer and Floodplain Manager Washington Co. Dept. of Plan Review & Permitting 240-313-2406 [email protected].
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