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Friday, September 30, 2011

Coordinated Needs Management Strategy (CNMS) 2011 Ohio GIS Statewide Conference Tim Beck, CFM – ODNR James Laine, GISP, CFM - Stantec. Friday, September 30, 2011. Agenda. CNMS Background and Overview Data Model Checks Ohio CNMS Stats Look at data in your community. What is CNMS?.

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Friday, September 30, 2011

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  1. Coordinated Needs Management Strategy (CNMS) 2011 Ohio GIS Statewide Conference Tim Beck, CFM – ODNR James Laine, GISP, CFM - Stantec Friday, September 30, 2011

  2. Agenda • CNMS Background and Overview • Data Model • Checks • Ohio CNMS Stats • Look at data in your community

  3. What is CNMS? • Geospatial inventory of FEMA studies and mapping needs • “Living” Database • Continuous new input and assessment • “Valid” Streams reassessed every five years • Tracks needs, requests, and study status • Risk MAP – Mapping Assessment and Planning • Critical component for multi-year planning • National Level Reporting Tool • NVUE (80% by FY14)

  4. CNMS Objectives and Overview • CNMS allows for: • Nationally consistent practice • Means for recording the voice of communities • Complete visibility • Record of the inventory • Status of the inventory • Means for measuring progress (metric) toward an operational goal – accountability • Means for tracking current activities • Means for projecting progress and planning for success

  5. CNMS Data Model

  6. CNMS Inventory (S_Studies_Ln) • Flooding source Centerlines • FEMA’s FIRM inventory (both mapped and unmapped hydrologic features) • Store pertinent attributes and features associated with each study or unmapped feature. • These lines enable NVUE tracking.

  7. CNMS Data Structure • Key fields include: • Reach ID • FIPS • Validation Status • Flood Zone and Study Type • HUC8 Key • Status Type • Miles • Leverage both Attribute & Spatial queries • Watershed based

  8. CNMS Request Records (S_Requests_Ar and _Pt) • Either flood data or cartographic requests • In most instances, determined by the lack of an existing floodplain model • Enables community, state, and other POCs to document requests • Are reviewed and determined to either warrant action, or are deferred • Considered during prioritization

  9. Simplified CNMS Lifecycle Diagram Input CNMS Phase 3 Mapped Inventory Stream Reassessed in 5 years Study Assessed: Stream Valid? YES NO Input Unmapped Requests Restudy makes stream Valid Stream Studied

  10. CNMS Phase 3 • Phases 1 and 2 built the inventory • First Nationwide CNMS Validation effort • First attempt of assessment through 17 elements • Further builds and refines FEMA study inventory • Conducts initial validation assessment for most detailed studies • Essential to long-term success of CNMS • Lays framework for CNMS use for years ahead

  11. CNMS Phase 3 “Before”

  12. CNMS Phase 3 “After”

  13. Validation Elements • Study determined Unverified if: • One critical element fails, or • Four or more secondary elements fail • Elements assess change in Engineering study data, for instance: • Change in gage record • New or removed dam, reservoir, or levee • Change in Land use and land cover • High Water Marks • New or removed hydraulic structures (bridges, culverts) • Channel reconfiguration or improvements • New regression equations • Availability of new topo

  14. Critical Elements • Elements • Major Change in Gage Record • Updated and Effective Discharges Differ Significantly • Inappropriate Model Methodology • Addition / removal of a Major Flood Control Structure • Channel reconfiguration outside SFHA • 5 or More New or Removed Hydraulic Structures • Significant channel fill or scour • If one or more elements are true then Flood Hazard Information is invalid ---Yes = FAIL No = PASS

  15. Secondary Elements • Elements • Use of rural regression equations in urban area • Repetitive Losses outside SFHA • Increase of 50% or more in impervious area • 4 or less new or removed hydraulic structures • Channel Improvements / Shoreline Changes • Availability of better topographic / bathymetry • Changes in vegetation or landuse • Failure to identify Primary Frontal Dune • Significant storms with High Water Marks • New Regression Equations • If four or more elements are true then Flood Hazard Information is invalid

  16. GIS Role – Data Used • Data sources • Gage Data: USGS or USACE gage data, PeakFQ WIN • FEMA, USGS – High Watermark Data • National Bridge Inventory – Scour • National Land Cover Dataset (NLCD 1992 & 2001) • National Urban Change Indicator (NUCI) • OSIP Imagery, • local and state knowledge

  17. GIS Role – Workflow • STARR Workflow • Automate Processes • Data Processing Tools • Standardize, streamline and simplify procedures • Decrease the potential for error • Standardize data formatting and storage • Flood Insurance Study (FIS) • Pre-Processing Rasters • Grouping Landuse/ Impervious types

  18. S1: Tool Use of rural regression equations in urbanized areas: • Check the FIS for analysis type: • If regression was not used to develop discharges, elements becomes NO. • S1 Tool • Determines % urban area in sub-watershed. • Checks against FEMA tolerance (15%) • Checks against regression type used. • If >15%(FEMA tolerance) and regression used…YES • Joined back to S_Studies_Ln (Y/N) • If regression was used and watershed has changed from rural to urban, this becomes YES. • Simple tool – could process Statewide

  19. S3: Tool Increase in impervious area in the basin of more than 50% (from 10% to 15%)? • Analysis of land use data, if urban area increases by 50% or more since Study Date, this element “Fails”. • Tool • Automated Toolbox process • Runs comparisons against multiple raster datasets to FEMA specified tolerances • Determines if there’s a significant change HUC • Compares the % change to tolerance (50%)can’t be greater than 50%, • Calc’s results and joins to STARR DB

  20. S7: Tool 30% change in land use in watershed since Study Date causes this element to “Fail”. • Tool • Automated Toolbox process • Runs comparisons against multiple raster datasets to FEMA specified tolerances • Determines if there’s a significant change HUC • Compares the % change to tolerance (30%)can’t be greater than 30%, did 3 or more land use types change significantly • Calc’s results and joins to STARR DB

  21. C4: Tool Addition/removal of a major flood control structure • If 30% of the drainage area for a study is impacted by a new/removed dam then causes the element to “Fail”. • Tool: • Compares date of Dam with Flood Study Date and assesses drainage area for each study. • Series of Toolbox tools.

  22. C7:Significant channel fill or scour • Inputs: NBI, Imagery, local and state knowledge • National Bridge Inventory dataset Item 113 can show scour; also FIS text may show fill or scour. • If fill or scour is suspected, community outreach may be necessary to confirm.

  23. S2: Repetitive losses outside the SFHA • FEMA to provide repetitive loss data; data to be used as-is. • If repetitive loss point plots outside of SFHA, then element “Fails”. Repetitive losses outside SFHA indicate that SFHA may be inaccurate. • Repetitive losses far outside SFHA may not count against element; flooding may be caused by local drainage issues or unmapped streams.

  24. C5: Channel Reconfiguration outside SFHA • Inputs are DFIRM SFHA, current imagery. • Direct comparison of stream on imagery to SFHA. Stream outside SFHA warrants a YES, and “Fails”. • Minor deviations can be classified as “mapping errors”, and would not necessarily cause element to fail.

  25. C6/ S4: New or removed hydraulic structures • Direct comparison between profile and roads shown on imagery/transportation lines. • C6 Check - Element “Fails” if 5 or more new or removed structures. • S4 Check – Element “Fails” if there are 1 to 4 new or removed structures. • Check FIS for mention of bridges that were intentionally not modeled/omitted from profile. • Document name and location of new/removed structure

  26. S6: Better topo available • Input updated topo info from National Topo Inventory, RSC, Federal, State, and local governments and agencies. • “Better” topo defined as having better resolution and being newer than topo used for study. Element Fails if better topo available. • Redelineated streams incorporating new topo pass this check, but check for newer topo or better resolution since date of redelineation.

  27. Benefits of CNMS • Allows spatial use of the information. • Queries, Maps and etc. • Now have Relational information. • Sequencing – Know what check it failed portion of the check it failed • Qualifying Studies: Valid/Unverified • Quantifying Studies: # miles • Used to Prioritize Watersheds for Risk Map. • Trifecta of Data • Risk • Need • Topo

  28. Ohio CNMS

  29. How do I access the data and get my needs recorded? • Short Term - Housed at Regional Support Center in Chicago • Contact RSC Bradford Hartley bradford.hartley@starr-team.com 312-780-7782 • Contact ODNR Matt Lesher matt.lesher@dnr.state.oh.us 614-265-6751 • Long Term – National Portal development underway

  30. Breakout Session • Look at the data in your community • Questions?

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