North Carolina CTS Committee Meeting #6

Report
North Carolina CTS
Committee Meeting #9
June 19, 2001
Introduction and Welcome
Status Updates:
Scoping/Basin Plans
Phase I Scoping
Schedule
Basin
White Oak
Lumber
Tar-Pamlico
Cape Fear
Neuse
Pasquotank
Final
Initial
Final Basin
Draft
Scoping
Scoping
Plan
Basin Plan
Meeting(s)
Meetings
Oct 25 - Nov 10,
2000
Nov 1 - Dec 1,
2000
Oct 3 - Dec 1,
2000
Nov 13 - Dec 8,
2000
Oct 24 - Dec 13,
2000
Nov 10 - Dec 13,
2000
Dec 14, 2000
Dec 19, 2000
(Jun 22, 2001)
Dec 28, 2000
Jan 4 - 5, 2001
(Jul 6, 2001)
Jan 23, 2001
Jan 30-31, 2001
(Jul 20, 2001)
Feb 27, 2001
Mar 6 - 8, 2001
(Aug 3, 2001)
Apr 13, 2001
Apr 23 - 24, 2001
(Aug 17, 2001)
May 7, 2001
May 17-18, 2001
(Aug 31, 2001)
Proposed Phase II
Scoping Plan

Scoping in 5 central river basins
planned to start October 1, 2001:

First emphasis on Chowan, Roanoke, and
Yadkin River Basins



36 counties
3 scoping teams
Catawba and New River Basins to follow


15 counties
scoping teams tbd
Status Updates:
Flood Data and
Mapping Development
G&O Status
Watershed Concepts Status


White Oak Basin
Tar Pamlico Basin
White Oak River Basin






Terrain: 100% Complete
Survey: 100% Complete
Hydrology: 50% Complete
Hydraulics: 33% Complete
Floodplain Mapping: 25% Complete
Sample DFIRMs presented at ASFPM
White Oak River Basin
Onslow County – Preliminary DFIRMs
Tar-Pamlico River Basin

Field Survey:




Structure Surveys: 100% Complete
Cross Section Surveys: 50% Complete
High Water Mark Surveys: 15% Complete
H&H:

Hydrology: 10% Complete
Revised Schedule

White Oak River Basin

DFIRM: August 30, 2001
Status Updates:
LIDAR Surveys and
DEM Development
Watershed Concepts — LIDAR
Pre-Processing Status 6/08/01
Watershed Concepts — Vegetation
Removal Status 6/08/01
G&O — Automated LIDAR
Processing Status 6/08/01
G&O — Bare Earth DEM
Generation Status 6/08/01
G&O — TIN Generation
Status 6/08/01
Status Updates:
LIDAR Quality Control Surveys
Quality Control Surveys
Status Updates:
DFIRM Specifications
DFIRM Graphic Specifications


State has received FEMA’s comments
on latest prototype
New prototype that incorporates final
comments will be generated for
inclusion in DFIRM Delivery Order
DFIRM Database Specifications



Draft DFIRM database tables
conceptualized for inventory, base
mapping, and DFIRM mapping
Engineering judgement tables under
discussion
Additional table definitions and
documentation needed
Status Updates:
Program Funding/Partnering
Information Technology
Requirements Analysis,
Preliminary System Design,
Work Plan, and Delivery Order
Higher Standards Draft
Document
Policy & Procedures Manual
Purpose of the Manual



Consolidate information about the NC
Flood Mapping Program in one location
Inform new staff about the program
Serve as a resource for future CTS
projects
Contents of the Manual

Two major units



Policies
Procedures
Appendices to include Mapping Activity
Statements, a template for the basin
plans, and templates for the Delivery
Orders
Policies Unit



Explanation of the process for raising
and resolving programmatic issues and
for establishing new policies
Flowchart depiction of the process
Policy establishment
Procedures for Mapping Unit


Overview of the flood mapping process
for North Carolina
Sections to describe the mapping
components:



Scoping
Leveraging Existing Geospatial Data
Resources
Production




Topographic Data Development
Flood Data Development
DFIRM Production
Quality Control Reviews
Procedures for Mapping Unit
(continued)










Post-Preliminary Processing
Data Dissemination and Archiving
Map Maintenance
Education/Outreach
Contracting Approach
Higher Standards
Flood Warning System
Post-Flood Verification
Partnerships
Funding
Procedures for Mapping Unit
(continued)

Where applicable, each of the sections
will have two subsections for (1)
Procedures and (2) Standards and
Specifications
Partnering/MOA
Community Partnering


Cooperating Technical Partner MOA
GIS Data Sharing MOA
Issue Discussion:
Surface Water Mapping for
DFIRMs
Purpose

This issue paper is a discussion of the
mapping and handling of surface water
features and names as part of the
DFIRM production for North Carolina.
Background

The mapping of surface waters is
desired to be comprehensive, accurate,
and complementary of the other data
layers that are part of the FMP and the
Corporate Geographic Database.
Existing Data Resources






Statewide 24k by River Basin
Statewide NHD24k by Cataloging Unit
FMP Breaklines 12k
Locally derived surface
The US Geographic Names Information
System (GNIS)
Existing FIRMs and FIS contain surface
water feature names
Breaklines





It contains single, double, and centerlines for
units 1 square mile and larger.
It does NOT contain all of the same linework
as USGS Topo.
It is more accurate (1:12,000 and 1:4,800).
It is hydrologically corrected (dendritic
network, flowing downhill).
It is topologically corrected (no dangles,
except at network inputs and outfalls).
Issue Discussion:
Panel Numbering
DFIRM Map Numbering System
SS MM LLLL PP X
SS = State FIPs code (37)
MM = EN 1,000,000-ft coordinates
LLLL = LRMP map numbers to include EN
100,000-ft coordinates and the EN 10,000-ft
coordinates
PP = place holders for additional EN 1,000-ft
coordinates (00 for panels printed at 1"=500')
X = panel suffix (“A” for initial edition)
DFIRM Map Numbering
System (Continued)


New DFIRM panels in North Carolina could
either be compiled at 1”=1,000’, covering an
area of 20,000 ft x 20,000 ft (20” x 20” maps);
or the DFIRM panels could be compiled at
1”=500’, covering an area of 10,000 ft x 10,000
ft (20” x 20” maps).
An additional 2-digits (both zeros) are held in
reserve as a “place holder” in the event that
future DFIRM panels may be printed at a larger
scale, e.g., 1” = 250’, covering an area of 5,000
ft x 5,000 ft for which the 1,000 ft coordinates
would either be 0” or 5."
Issue Discussion:
Potential Delegation of LOMCs
Potential Delegation of LOMCs

On Friday June 15, 2001, the following
individuals from NC visited D&D for a LOMC
Introduction / Workshop







Gary Thompson (NCGS)
Kurt Sumner (Executive Director ACSM, National)
Tom Morgan (NCSS Representative on CTS)
Johnie Garrason (NCSS Member and Board
Examiner for NC Engineers and Surveyors)
Richard Bennett (NCSS President)
Benji Brown (NCSS Member and City of
Wilmington Representative)
Matt Miller (FEMA HQ) Teleconferenced in for a portion of
the afternoon discussion
Potential Delegation of LOMCs

The following topics were covered during
the LOMC Introduction/Workshop








General LOMC Requirements
New LOMR-F Rule
Processing Cases with Special Considerations
Call Center Support
LOMA 2000
Processing Workshop
Other Related Processing Issues
Where do we go from here?
Action Items/Wrap Up

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