Abstract

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Paper
ArcGIS Tool for BFE Placement after Vertical Datum Conversion
Track: Database Design, Automation, and Management
Author(s): Richard Stuhan, Andrew MacLeod

Base Flood Elevation (BFE) contours are drawn on Flood Insurance Rate Maps (FIRMs) to represent the 100-year flood water surface elevation. The FEMA Map Modernization Program (MMP) includes the creation of Digital FIRMs (DFIRMs). One goal of the MMP is to convert all flood maps from NGVD

29 to NAVD 88. BFEs are placed as whole-foot contour lines to represent the Flood Profile. Typically, the datum conversion value is not a whole number, which necessitates a revision of BFE contour locations. A semiautomated toolset was developed with ArcGIS ModelBuilder to assist in locating the datum converted BFE locations. This toolset uses existing streamline and cross section data as inputs and produces a point shapefile. This point shapefile is the location of the datum converted whole-foot BFE locations.



Richard Stuhan
URS Corporation
Environmental Planning
7720 N. 16th
Suite 100
Phoenix 85020
US
Phone: 602 861 7462
E-mail: richard_stuhan@urscorp.com

Andrew MacLeod
URS Corporation
Floodplain Management Group
333 E. Wetmore, Suite 611
Tucson , AZ 85705
US
Phone: (520) 887-1800
E-mail: andrew_macleod@urscorp.com