Behind The Curtain: GIS and Floodplain Mapping Adam Daily, Bradford Hartley, & Adam Pooler GIS Analysts Stantec Consulting Services Inc Ohio GIS Conference September 10-12, 2008 Crowne Plaza North Hotel Columbus, Ohio

Introduction to Map Book Generator

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 & Attribute Lettered Cross Sections Extend Cross Sections

OLD verse NEW 1.Accuracy 2.Time/Automated process 3.Digital 4.Costs INSERT PIC

Flood 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 or

Flood 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 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 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 Status (updated 09/03/2008)

Where can I access the data

End of Presentation Questions ?