A Total Water Resource A division of Hayes, Seay, Mattern & Mattern, Inc. North Carolina Floodplain Mapping State of North Carolina North Carolina Floodplain

A Total Water ResourceA division of Hayes, Seay, Mattern & Mattern, Inc.

North Carolina Floodplain MappingState of North Carolina

North Carolina

Floodplain Mapping

State of North Carolina



Web-Based

Survey



Web-Based Survey

• Survey ran from Jan. 16 - Feb. 20

• Ten different sections– IT– Data– Applications



Web-Based Survey



Responses

01020304050607080

No.

Res

pons

es

Gen

eral

Info

rmat

ion IT

Floo

d D

ata

Elev

atio

nD

ata

DFI

RM

Res

ults

Engi

neer

ing

Dat

a

Surv

eyD

ata

Bas

e D

ata

Pote

ntia

lA

pplic

atio

n

Add

ition

alIs

sues

As of Feb. 5, 2001



Responses

0

10

20

30

40

50

60

No.

Res

pons

es

Cou

nty

Sta

te

Fede

ral

Mun

icip

al

Reg

iona

lG

over

nmen

ts

Trib

al

Uni

vers

ity

Pri

vate

Oth

er

As of Feb. 20, 2001



Responses

County responded to survey

As of Feb. 10, 2001



General Information

• 37% of the organizations - Providers• 87% of the organizations - Users

As of Feb. 20, 2001



General Information IT

• Operating Systems:– Win 95/98 44.9%

– Win NT 61.0%

– Win 2000 30.5%

– UNIX 22.0%

– AIX 7.6%

– RS6000 5.9%

– MAC OS 4.2%

– Other 13.5% (not specified)

As of Feb. 20, 2001




• Network Connections– Modem (28.8-56.6K) 17.8%

– 128 K 5.9%

– DSL 6.8%

– Cable modem 5.8%

– T1 50.8%

– > T1 13.6%

– Don’t know 11.9%

As of Feb. 20, 2001




• GIS Software– 92.4% uses GIS or CAD

As of Feb. 20, 2001




• GIS Software– ArcInfo 68.6%– ArcView 83.9%– GenaMap 0.8%– Erdas Imagine 5.9%– MapInfo 11.9%– Small World <1.0%– SAS 3.4%– AutoCAD 27.1%– ArcCAD 3.4%– Microstation 4.2%

As of Feb. 20, 2001



DFIRM Results

Question Yes No NoAnswer

Do you currently use effective DFIRMS? 18.8 81.3 0.0

Would you use effective DFIRMS? 92.2 3.1 4.7

Do you currently use effective FIS report? 40.6 56.3 3.1

Would you use effective FIS report? 73.4 15.6 10.9

Do you currently use preliminary DFIRMS? 10.9 89.1 0.0

Would you use preliminary DFIRMS? 70.3 14.1 15.6

Do you currently use preliminary FIS report? 7.8 85.9 6.3

Would you use preliminary FIS? 51.6 28.1 20.3

As of Feb. 5, 2001



DFIRM ResultsData Type Browser Static File CD Other

DFIRM 71.8 87.5 39.0 -

FIS 65.6 68.8 31.1 3.1

Preliminary DFIRM 62.5 67.2 28.1 3.1

Preliminary FIS 56.2 51.6 23.4 3.1



Elevation Data


Do you currently use DEM data? 49.1 50.9 0.0

Would you use DEM data – www downloadable? 96.5 3.5 0.0

Do you currently use TIN data? 28.1 71.9 0.0

Would you use TIN data – www downloadable? 91.2 8.8 0.0

Do you currently use mass points and break linedata?

17.5 80.7 1.8

Would you use Mass Point and break line data –www downloadable?

80.7 17.5 1.8

Do you currently use backup data? 7.0 93.0 0.0

Would you use backup data – wwwdownloadable?

47.4 49.1 3.5



Elevation DataData Type Browser Map Panel Custom CD Other

DEM 64.9 77.2 75.4 42.1 7.0

TIN 59.6 73.7 73.7 40.4 5.3

Mass points 50.9 63.3 63.3 35.1 10.5

Backup 33.3 35.1 29.8 21.1 3.5



Flood Data


Do you currently use stream data? 64.8 35.2 0.0

Would you use stream data – wwwdownloadable?

87.0 9.3 3.7

Do you currently use flood boundaries data? 74.1 25.9 0.0

Would you use flood boundaries data – wwwdownloadable?

92.6 5.6 1.9

Do you currently use floodways data? 51.9 46.3 1.9

Would you use floodways data – wwwdownloadable?

79.6 14.8 5.6

Do you currently use cross section data? 33.3 63.0 3.7

Would you use cross section data – wwwdownloadable?

79.6 14.8 5.6



Flood Data


Do you currently use base flood elevation data? 42.6 55.6 1.9

Would you use base flood elevation data – wwwdownloadable?

90.7 7.4 1.9

Do you currently use zone label data? 59.3 40.7 0.0

Would you use zone label data – wwwdownloadable?

87.0 11.1 1.9



Flood DataData Type Browser Map Panel Custom CD Other

Streamlines 68.5 70.4 70.4 33.3 3.7

Flood Boundaries 75.9 74.0 74.0 40.7 3.7

Floodways 63.0 63.0 61.1 31.5 1.9

Cross sections 66.7 62.9 59.3 31.5 1.9

Base Heights 70.4 72.2 70.4 33.3 1.9

Flood Zone 61.1 66.7 62.9 31.5 1.9



Engineering Data


Do you currently use engineering models? 26.3 73.7 0.0

Would you use engineering models – wwwdownloadable?

71.9 26.3 1.8

Do you currently use back up engineering data? 19.3 71.9 8.8

Would you use backup engineering data – wwwdownloadable?

61.4 31.6 7.0



Engineering DataData Type Browser Map Panel Custom CD Other

Models 60.0 54.5 56.4 29.1 1.8

Backup eng 54.5 52.7 54.5 25.4 1.8



Survey Data


Do you currently use ERM/BM data? 56.1 43.9 0.0

Would you use ERM/BM data – wwwdownloadable?

78.9 19.3 1.8

Do you currently use structure data? 28.1 70.2 1.8

Would you use structure data – wwwdownloadable?

77.2 21.1 1.8

Do you currently use cross section data? 36.8 61.4 1.8

Would you use cross section data – wwwdownloadable?

66.7 26.3 7.0



Survey Data


Do you currently use HWM data? 28.1 70.2 1.8

Would you use HWM data – www downloadable? 75.4 17.5 7.0

Do you currently use photograph data? 43.9 56.1 0.0

Would you use photograph data – wwwdownloadable?

75.4 22.8 1.8

Do you currently use control network data? 28.1 68.4 3.5

Would you use control network data – wwwdownloadable?

64.9 35.1 0.0



Survey DataData Type Browser Map Panel Custom CD Other

ERM 64.9 66.7 64.9 33.3 1.8

Structure Data 59.6 61.4 57.9 26.3 1.8

Cross section 50.8 47.4 50.8 22.8 3.5

High water marks 61.4 56.1 59.6 31.6 1.8

Photos 61.4 52.6 50.9 31.6 1.8

Control points 52.6 47.4 47.4 24.6 3.5



Base DataQuestion Yes No No

AnswerDo you currently use DOQQ data? 56.9 41.4 1.7

Would you use DOQQ data – wwwdownloadable?

87.9 10.3 1.7

Do you currently use DFIRM support data? 27.6 69.0 3.4

Would you use DFIRM support data – wwwdownloadable?

72.4 20.7 6.9

Do you currently use notes and borders data? 19.0 74.1 6.9

Would you use notes and borders data – wwwdownloadable?

62.1 25.9 12.1



Base DataData Type Browser Map Panel Custom CD Other

DOQQ 70.2 66.7 63.2 35.1 1.8

Other 56.1 57.9 57.9 29.8 1.8

Notes 43.9 57.9 N/a 29.8 1.8



Potential Applications

Application High Medium Low None

Download data in nativefile types andcoordinate systems

83.9 11.3 1.6 3.2

Real time flood warningsystems

64.5 24.2 8.1 3.2

Property/Floodboundary Look up

66.1 14.5 16.1 3.2

Detailed tracking of data 56.5 32.3 4.8 6.5

Upload flood datarevisions

54.8 32.3 9.7 3.2

Rainfall maps 51.6 32.3 14.5 1.6

Water quality analysis 48.4 35.5 12.9 3.2

Spill modeling 51.6 25.8 19.4 3.2



Potential Applications

Application High Medium Low None

Evaluation of rezoningrequests

43.5 24.2 29.0 3.2

Inventory management 32.3 43.5 21.0 3.2

AQ/QC of flood data 54.8 9.7 11.3 6.5

Work ordermanagement

29.0 27.4 35.5 8.1

Approximate floodplainboundary delineator

48.4 22.5 15.1 14.8




Do you want WWW access to historic FIRMS? 62.7 30.5 6.8

Additional Issues

• Requests– Well defined hydrologic units– CGIA offer desktop GIS products– Canopy height– Digital historic aerial photographs



Conclusions (prelim.)

• WWW based availability of Floodplain related data would increase its usage

• Data access by: map panel, custom area and browser are preferred

• Data available in shape file and .e00 format• Images: MrSID, JPEG and TIFF format• Applications: Download data, real-time flood warning,

Property/Flood boundary look-up



Interview

Questions



Interview

• Who do you represent?

• How do you anticipate you will interact with the system?

• What is the most important aspect of this project to you?



Applications

• Download data in native file types and coordinate systems– This would allow users to download floodplain data in a GIS format for use in spatial

analysis and overlay mapping.

• Property / flood boundary lookup– The user will enter an address or parcel number and the system will zoom to the area

and show a map with the flood boundary and the address. This will assist local communities in complying with existing flood ordinances. Example uses would include identifying homes in the 100-year floodplain or locating properties in the FEMA Floodway.

• Approximate floodplain mapping delineator– This would determine an approximate flood elevation at any location where

the stream is not studied by FEMA or the upcoming NC Floodplain Project.



Applications

• Real time flood warning and forecasting– View in real-time streams that are at or approaching flood stage and have the ability to predict when

a river will reach its peak and the predicted stage at peak. Using these predicted stages - view

a map of the floodplain resulting in this flood stage. View which roads are closed or overtopped. • Spill modeling

– A live application which would allow emergency response centers to respond to a hazardous waste spill and direct clean up crews to a particular location. The application will trace to spill to the extents of the State line and will give estimated times of arrival at various locations.

• Evaluation of rezoning requests– The impacts of rezoning requests could be evaluated using the GIS and modeling tools to

determine the impacts to flood elevations based on rezoning requests and the following development.



Applications

• Rainfall maps– View historical flooding rainfall data spatially distributed across the state. View real time

rainfall data during a storm. The ability to print our download images of the rainfall

depths and intensities. • Inventory management

– This application would allow users to view survey and attribute information about bridges, culverts and dams along a river or stream. Information available will include size, shape, number of culverts, length, bridge span, dam elevation, overtopping elevation, frequency of overtopping, etc. Users could also view and download digital pictures of the structure.

• Water quality analysis– Using data from computer models in the GIS, users could view impaired watersheds and

streams based on given pollutants (nitrogen, sediment, phosphorus, etc)



Applications

• Detailed Tracking of Data

– Allow the State to determine who has a particular type of data so that if it is revised. • Work order management

– Assist the local communities comply with NPDES. The NC Floodplain Project will organize

all of the terrain data as well as large structures. • QA / QC of flood data

– Allow stakeholders to check the quality of the data for their own purposes. • Upload flood data revisions

– Allow stakeholders to upload new data that the State may use to update the flood analysis. Examples of updates would include new culverts or bridges, modifications to existing culverts and bridges, etc




Baker



Agenda

• Welcome and Introduction

• Overview Web-Based Survey

• Interviews

• Wrap-up



Work Plan

FY 2003

FY2001

FY 2002



Contents

• Responses to the Survey

• Results of the Survey

• Questions and Answers



Survey Link

• ps.esri.com/ncflood/survey/



Web-Based Survey



Web-Based Survey



Next steps

Today

System Design

CTS meeting

FinalPresentation

FEMA Interviews



Thank you for participating in the

interviews



Other Information

• Hours saved: -3 - 100s

• Peak loads: 5-20

• Peak Number of Users: 1 - 30



Additional Issues

• Survey– Grueling– Thorough/Overwhelming– Too long– Pleased that the State is working on this project

Documents

A Total Water Resource A division of Hayes, Seay, Mattern & Mattern, Inc. North Carolina Floodplain Mapping State of North Carolina North Carolina Floodplain