north carolina cts committee meeting #9 june 19, 2001

North Carolina CTS North Carolina CTS Committee Meeting #9Committee Meeting #9

June 19, 2001

Introduction and Welcome Introduction and Welcome

Scoping/Basin Plans

Status Updates:Status Updates:

Phase I Scoping Phase I Scoping ScheduleSchedule

Proposed Phase II Proposed Phase II Scoping PlanScoping 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

Flood Data andMapping Development

Status Updates:Status Updates:

G&O StatusG&O Status

Watershed Concepts Watershed Concepts StatusStatus

White Oak Basin Tar Pamlico Basin

White Oak River White Oak River BasinBasin

Terrain: 100% Complete Survey: 100% Complete Hydrology: 50% Complete Hydraulics: 33% Complete Floodplain Mapping: 25% Complete Sample DFIRMs presented at ASFPM

White Oak River BasinWhite Oak River Basin

Onslow County – Preliminary Onslow County – Preliminary DFIRMsDFIRMs

Tar-Pamlico River Tar-Pamlico River BasinBasin

Field Survey: Structure Surveys: 100% Complete Cross Section Surveys: 50%

Complete High Water Mark Surveys: 15%

Complete H&H:

Hydrology: 10% Complete

Revised ScheduleRevised Schedule

White Oak River Basin DFIRM: August 30, 2001

LIDAR Surveys andDEM Development

Status Updates:Status Updates:

Watershed Concepts — LIDARWatershed Concepts — LIDARPre-Processing Status 6/08/01Pre-Processing Status 6/08/01

Watershed Concepts — Watershed Concepts — Vegetation Removal Status Vegetation Removal Status

6/08/016/08/01

G&O — Automated LIDAR G&O — Automated LIDAR Processing Status 6/08/01Processing Status 6/08/01

G&O — Bare Earth DEM G&O — Bare Earth DEM Generation Status 6/08/01Generation Status 6/08/01

G&O — TIN GenerationG&O — TIN GenerationStatus 6/08/01Status 6/08/01

LIDAR Quality Control Surveys

Status Updates:Status Updates:

Quality Control Quality Control SurveysSurveys

DFIRM Specifications

Status Updates:Status Updates:

DFIRM Graphic DFIRM Graphic SpecificationsSpecifications

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 DFIRM Database SpecificationsSpecifications

Draft DFIRM database tables conceptualized for inventory, base mapping, and DFIRM mapping

Engineering judgement tables under discussion

Additional table definitions and documentation needed

Program Funding/Partnering

Status Updates:Status Updates:

Information Technology Information Technology Requirements Analysis, Requirements Analysis,

Preliminary System Design, Preliminary System Design, Work Plan, and Delivery Work Plan, and Delivery

OrderOrder

Higher Standards Draft Higher Standards Draft DocumentDocument

Policy & Procedures Policy & Procedures ManualManual

Purpose of the Purpose of the ManualManual

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 Contents of the ManualManual

Two major units Policies Procedures

Appendices to include Mapping Activity Statements, a template for the basin plans, and templates for the Delivery Orders

Policies UnitPolicies 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 Procedures for Mapping UnitUnit

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 Procedures for Mapping UnitUnit

(continued)(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 Procedures for Mapping UnitUnit

(continued)(continued) Where applicable, each of the

sections will have two subsections for (1) Procedures and (2) Standards and Specifications

Partnering/MOAPartnering/MOA

Community Community PartneringPartnering

Cooperating Technical Partner MOA

GIS Data Sharing MOA

Issue Discussion:Issue Discussion:Surface Water Mapping for

DFIRMs

PurposePurpose

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.

BackgroundBackground

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 Existing Data ResourcesResources

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

BreaklinesBreaklines

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:Issue Discussion:

Panel Numbering

DFIRM Map Numbering DFIRM Map Numbering SystemSystem

SS = State FIPs code (37)

X

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)

SSMMLLLLPP

DFIRM Map Numbering DFIRM Map Numbering System (Continued)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:Issue Discussion:

Potential Delegation of LOMCs

Potential Delegation of Potential Delegation of LOMCsLOMCs

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 Potential Delegation of LOMCsLOMCs

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 UpAction Items/Wrap Up