Friday, September 30, 2011

Coordinated Needs Management Strategy (CNMS)

2011 Ohio GIS Statewide Conference

Tim Beck, CFM – ODNRJames Laine, GISP, CFM - Stantec

• CNMS Background and Overview

• Data Model• Checks• Ohio CNMS Stats• Look at data in your

community

Agenda

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)

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

CNMS Data Model

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.

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

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

Simplified CNMS Lifecycle Diagram

Input CNMS Phase 3 Mapped

Inventory

NO

Restudy makes stream Valid

Stream Studied

YES

Input Unmapped Requests

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

CNMS Phase 3 “Before”

HUC 02030103Status "Before" MilesNVUE Compliant 182.5Being Studied -To Be Studied -Unknown 1069Total inventory 1251.5

NVUE 14.6%

CNMS Phase 3 “After”

HUC 02030103Status "After" MilesNVUE Compliant 707.2Being Studied 42To Be Studied 215Unknown 142Total inventory 1106.2NVUE 63.9%"Future" NVUE 67.7%

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

Critical Elements

• Elements1. Major Change in Gage Record2. Updated and Effective Discharges Differ Significantly3. Inappropriate Model Methodology4. Addition / removal of a Major Flood Control Structure5. Channel reconfiguration outside SFHA6. 5 or More New or Removed Hydraulic Structures7. Significant channel fill or scour

• If one or more elements are true then Flood Hazard Information is invalid ---Yes = FAIL No = PASS

Secondary Elements

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

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

S1: ToolUse 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

S3: ToolIncrease 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

S7: Tool30% 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

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.

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.

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.

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.

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

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.

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

Ohio CNMS

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.com312-780-7782

– Contact ODNRMatt Leshermatt.lesher@dnr.state.oh.us614-265-6751

• Long Term – National Portal development underway

Breakout Session

• Look at the data in your community• Questions?