Title: NAVARRO COUNTY, TX FLOODPLAIN STUDY
1NAVARRO COUNTY, TX FLOODPLAIN STUDY
- County Offices
- Corsicana, TX
- April 27, 2007 at 900AM
2Scoping Meeting Agenda
- Sign-in Sheet
- Introduction
- Map Modernization Studies
- Map Production Process
- Map Adoption Process
- Roles FEMA Contractors
- Levee Certification
- Outreach / Public Awareness
- Scoping Meeting Summary
- DISCUSSION ----- Community Needs
3Map Mod Studies
4Map Modernization Program
Flood Mapping Project Phases
Preliminary DFIRM
Post Preliminary Processing
Project Scoping
Community Coordination Mapping
Needs Assessment
Topographic Data Acquisition
DFIRM Production
Time frames given are approximate and will vary
from study to study
5Map Mod Roles - FEMA Contractors
- FEMA Headquarters
- Set National Policy
- Budget Requests
- LOMR Approval Signature
- Congressional Liaison
- FEMA Region VI
- Administrate Policy
- Manage IDIQ Contract Task Orders
- Manage RMC Task Order
- Outreach Public Awareness
- National Service Provider - NSP
- Support FEMA Headquarters
- Procedure Memos
- GS
- Mapping Information Platform (MIP)
- LOMR Processing
- Library Data Storage
- Regional Management Center - RMC
- Support Region VI
- Issue Resolution (Engineering/GIS/Mapping)
- Receipt of Study Data
- Quality Assurance Audit
- Coordinate Project Management
- Post Preliminary Processing
- MIP Training and Data Entry
- Outreach and Public Awareness
6Study Contractor Task Orders
- Scoping Task Order
- Scoping Meeting
- Base Map Ortho vs. Vector
- Proposed Panel Scheme
- Scoping Meeting Report
- GIS Shape File Showing DFIRM Mapping Needs for
the County - DFIRM and Flood Insurance Study Task Order
- Digital Flood Insurance Rate Map
- Update Flood Insurance Study Text
- Address mapping needs up to limit of budget
- Update Community on study negotiated scope
- Update Community on progress of study
7Halff Associates, Inc. Study Contractor
- Walter Skipwith, PE
- wskipwith_at_halff.com
- Jessica Baker, EIT, CFM
- jbaker_at_halff.com
- Halff Associates, Inc.
- 8616 Northwest Plaza Dr.
- Dallas, Texas 75225
- (214) 346-6200 Office
- (214) 273-1307 Fax
8What and Why Are We Scoping?
- Information Search
- Coordination / Outreach
- Assess Community Mapping Needs
9Map Modernization 1834 Style (Pre-FIRM)
10Map Modernization 2007 Style DFIRM Product
11Overall Scoping Study
12Scoping Activities
13Pertinent Data on Navarro County
- Area 1,086 Sq. Mi.
- Density 44 Persons/Sq. Mi.
14Pertinent Data on Navarro County
- 27 Existing FIRMs (Printed)
- Scales 1200, 500, 1000, and 2000
- Flood Insurance Policies in Place 118
- LOMCs 37
- Claims 31 (195,134)
15Navarro County Re-Study
- Scoping
- 15 miles of Detail Study (Zone AE)
- 1640 miles of Approximate Study (Zone A)
- 33 Proposed FIRMs
16The Study Process
- Information Search
- Base Map and Terrain Data Acquisition
- Field Survey
- Hydrology
- Hydraulics
- Mapping
- Reporting (TSDN)
- Coordination /Outreach
17Base Mapping
- Local Provided Planimetrics
- USDA National Agricultural Imagery Program (NAIP)
- USGS Contours Supplemented with Local Data
Local High Resolution Data
USGS 7.5 Minute Quads
USGS DOQQ
18Terrain Information
- Terrain Map Sources
- Local Data
- USGS Contour Maps 30 M DEMs
- LiDAR
- Formats
- Digital (GIS Shapefiles, AutoCAD Files)
- Hardcopy
USGS 7.5 Minute Quads
Local High Resolution Data
USGS 30M DEM
19DATUM NAVD 88 / NAD 83
- The majority of existing FIRM panels vertical
datums - National Geodetic Vertical Datum (NGVD) 29
- Local Datum
- New DFIRM Panel datums will be standardized to
- Vertical - North America Vertical Datum of 1988
(NAVD 88) - Horizontal North American Datum of 1983 (NAD 83)
20Possible Mapping Products Available
- New Detailed Study
- Enhanced Approximate Study
- Redelineation of Existing Detailed Study
- Approximate Study (Zone A Refinement)
- Digital Conversion
21New Detailed Study
- Field Survey
- New Topo/Orthophoto
- Detailed Hydrologic and Hydraulic Modeling
- Floodway Computations
- Flood Profiles
- Calibrated to Historical Events
- Most Expensive Type of Study
22Sample of Detail Study Stream
- Cross-Sections
- BFEs
- Floodways
23Enhanced Approximate Study
- Limited Detailed Study
- No (or) Limited Structure Surveys
- No (or) Limited Floodways
- No (or) Limited Profiles
- Advantages
- Cost is Much Less Than Detailed Study
- More Streams Can Be Studied
24Redelineation Streams
- Applies to Existing Detailed Study Streams (Zone
AE) - Vertical Datum Update from 1929 to 1988
- Flood Boundaries Mapped to the Best Available
Topography
25Zone AE Redelineation
26Approximate Study
- Zone A Refinement
- Automated HH Procedures
- Boundaries Mapped to Best Available Topography
27Sample of Existing Zone A
100-yr Boundary
Stream Centerline
28Zone A Refinement
29Digital Conversion
- Utilize the Existing Flood Zone Information
- Advantages Low Cost Solution
- Disadvantages Boundaries may not agree with the
best available topographic data
30Floodplain Mapping
31DFIRM Database
Digital FIRM
32DFIRM Vector vs. Ortho Based
33DFIRM Vector vs. Ortho Based
Vector Based
Ortho Based
34Navarro County Effective FIRM Panel Layout
27 Effective Panels
35Navarro County Proposed DFIRM Panel Layout
33 Proposed Panels
36Technical Support Data Notebooks (TSDNs)
- Notebooks
- Scoping Report
- Topographic Data
- Base Map
- Hydrology
- Hydraulics
- DFIRM
- Final
- Complete Documentation of the Project
- Contacts
- Meeting Minutes
- Data
- Analyses Assumptions
- Other Information as needed
37FIS Report
- Countywide Flood Insurance Study
- Text
- Profiles
- Data Tables
38Halff FEMA Re-Study Website Hotline
www.halff-femastudy.com Hotline 1(877) HALFF-TX
39Levees Protection with Risk
- Levees are designed to provide specific level of
protection - They can be overtopped or fail in larger flood
events - They require regular maintenance and periodic
upgrades to retain their level of protection - FEMA urges people to understand their flooding
risk involving levees
40Levee Ownership
- FEMA does not own, operate, maintain or certify
any levees - FEMA can accredit a levee certification provided
by others - The levee owner can certify the design,
construction, operation and maintenance of a
levee - Community is benefiting from the levee
41FEMA Requirements
- FEMAs certification requirements for Levee
Design, Construction, Operation and Maintenance
to gain FEMA Accreditation. - A. Certification Standard is 44 CFR 65.10
- Certification checklist is based on requirements
from 44 CFR 65.10. - Revised date is October 1, 1999.
-
- B. Procedure Memorandum No. 34 (PM
34)-Certifcation Documents are available to
submit within 30 days. - Interim Guidance for Studies Including Levees
- August 22, 2005
- C. Procedure Memorandum No. 43 (PM 43)-Need time
to gather certification documents-24 months
allowed. - Guidelines for Identifying Provisionally
Accredited Levees - September 25, 2006
- Revised March 16, 2007
4244 CFR 65.10 Highlights
- To be certifiable, the levee system must be owned
and operated by a public entity - The levee owner has the ultimate responsibility
of certifying the levee - Design and Construction requirements
- Freeboard, Foundation, etc.
- Operation and Maintenance requirements
- OM manual, maintenance records, etc.
- Federal Agency (USACE) who constructed levee can
provide certification - Levee must be certified/re-certified every time
the map is changed
4344 CFR 65.10
44PM 34 Highlights
- Interim guidance to establish certification
process (flowchart) - Specifies that levee systems that are mapped by
FEMA are designed, constructed, operated and
maintained to standards (44 CFR 65.10) - Requires obtaining verification that
certification requirements are and continue to be
met - Requires that necessary certifications are
provided by the responsible party
45PM 34
46PM 43 Highlights
- Created to prevent levee issues from holding up
DFIRMs - Allows 2 years to compile certification
documentation - Not allowed for any levee that requires any
construction work to be done for certification - Public versus Privately owned levees (PAL
Scenario) - PAL Agreement
47PM 43 and Guidance 25
48Levee Checklist
49FEMA Accreditation of Certification
- If adequate certification is provided and
accepted, FEMA will accredit the levee as
providing protection - If levee certification is not provided, the area
will be mapped with the levee NOT providing
protection
50Post Preliminary andMap Adoption Process
- Presentation of Preliminary DFIRM to Community
(also known as CCO Meeting) - 90-Day Appeal Period
- Appeal Resolution
- Letter of Final Determination (LFD)
- 6 Month Compliance (Map Adoption) Period
- Final adoption and/or revision of Floodplain
Management Ordinance - Effective DFIRM
51Ordinance Assistance
- Primary Resource TFMA
- FEMA Region VI
- Sample Model Ordinances
- Ordinance Checklist
- Suggestions for Higher Standards
- Application to join NFIP
52Outreach
- We all do Outreach
- In our field of expertise.
53Outreach
- Technical Community Study Contractor
communicates with community through scoping
meetings, information meetings, periodic written
status reports, web sites, etc. - State NFIP Coordinators State Associations
Lenders Insurance Agents via FEMA Region 6
through meetings, correspondence, conferences,
special announcements, etc. - Public Officials via FEMA Region 6 communicates
directly with community officials providing
assistance in ordinance development and map
adoption. - General Public via FEMA Region 6 Public
Awareness providing information and materials for
distribution to alert the public of new study
efforts, issuance and availability of Preliminary
DFIRMs, appeals process, and community map
adoption.
54FEMA Public Awareness
- Provide Public Awareness materials
- Assist in keeping the public informed
- Assist in obtaining publications regarding Map
Modernization - Designated Point of Contact will be provided
information and/or materials as needed or
requested
55Memorandum of Agreement (MOA)
- Community Partner MOA
- Says that you know the study is occurring and
will cooperate with FEMA - This document is similar to the resolution that
was originally signed by the community upon entry
into the NFIP.
56Scoping Meeting Summary
- Completed Sign-In Sheet
- Answered questions regarding Study Process
- Identified available data pertinent to the study
- Decided Base Map Type
- Decided Paneling Scheme for Countywide Study
- Obtained Priorities from Communities
- Obtained Point of Contact for Public Awareness
materials - Distributed Memorandum of Agreement between FEMA
and Communities
57Community Needs Discussion
58- Thank you for your time and input
59Contacts
- FEMA
- Lynn Hilburn COTR
- howard.l.hilburn_at_dhs.gov
- Ph (940) 898-5165
- Shari Brand Public Outreach Coordinator
- shari.brand_at_dhs.gov
- Ph (940) 898-5358
- Dale Hoff Compliance Specialist
- Dale Hoff_at_dhs.gov
- Ph (940) 898-5128
State NFIP Coordinator Mike Howard
mhoward_at_tnrcc.state.tx.us Ph (512)
239-6155 Study Contractor Walter
Skipwith wskipwith_at_halff.com Ph (214)
346-6220 Jessica Baker jbaker_at_halff.com Ph
(214) 217-6692 RMC Contact Steve Altman
saltman _at_mbakercorp.com Ph (940) 783-4155