Behind The Curtain: Behind The Curtain: GIS and Floodplain MappingGIS and Floodplain Mapping

Adam Daily, Bradford Hartley, & Adam Pooler

GIS Analysts

Stantec Consulting Services Inc.

2008 Ohio GIS Conference

September 10-12, 2008

Crowne Plaza North Hotel

Columbus, Ohio

Introduction to Map BookIntroduction to Map BookGeneratorGenerator

Floodplain Delineation

• Rectify Original Flood

Insurance Rate Map (FIRM)

• Digitize Cross Sections

• Create Water Surface TIN

• Create Ground TIN

• Use Delineator

• Essential fields to have while rectifying

– Transportation

– Orthophotography

• Find General

Area

• Use “Fit to

Display”

Rectify

Rectify (cont.)

• Draw your “Links”

• Fine tune your

rectification

using floodway

structures such as

bridges, dams, and

Culverts.

Digitize Cross Sections & AttributeLettered Cross Sections

Extend Cross Sections

OLD verse NEW

1. Accuracy

2. Time/Automated process

3. Digital

4. Costs

INSERT

PIC

Flood Map DesktopFlood Map Desktop

• Created by PBS&J to streamline the DFIRM creation process

• Available to the general public• Extension to ArcGIS• Versions for 9.3 and ArcSDE enterprise

geodatabase users• www.pbsj.com or email

floodmapdesktop@pbsj.com

Flood Map DesktopFlood Map Desktop

• Non-dependant on MXDs• Multi-User Editing of

Graphics (SDE not required)• Organize and control data

and map layout • Advanced tools and options

outside of DFIRM projects

Map Modernization ProgramMap Modernization Program

• Digital seamless & nationwide maps and data layers

• Best available data• Easily accessible data• Fully integrate FEMA’s state

and local partners into the mapping process

Leveraging Map Mod DataLeveraging Map Mod Data

• Incorporate layers into planning processIncorporate layers into planning process– Permitting / Building development– Economic Development Plans– Emergency management planning– Future conditions modeling

• Flood hazard mitigation– Become a member of the NFIP– Assess community needs and update standards– Minimize risk such as repetitive loss structures

• Other uses separate from intended purposes

County StatusCounty Status(updated 09/03/2008)(updated 09/03/2008)

Where can I access the dataWhere can I access the datahttp://msc.fema.govhttp://msc.fema.gov

End of Presentation

Questions ?