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Layer: Floodplain - Consultant Study (DPIE) (ID: 33)

Name: Floodplain - Consultant Study (DPIE)

Display Field: COMMENTS

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: The floodplain boundary line feature class represents the 100-yr floodplain boundary delineation based on the floodplain studies done by private consultants and DoE. Boundary lines were digitized based on a hierarchy decision tree in relation to the source documentation and mapping available. 1. The 100-yr floodplain boundary was digitized from floodplain mapping that was georeferenced using grid coordinate marks and / or aerial imagery features. If the 100-yr floodplain boundary was clearly delineated on the mapping, the GIS feature was digitized from the georeferenced mapping.2. If the 100-yr floodplain boundary was not clearly indicated on the mapping and floodplain cross sections existed indicating the elevation of the 100-yr floodplain boundary, the floodplain boundary was digitized using 2-foot elevation contours and extrapolated between cross sections, crossing at the intersection of the cross section and associated contour.3. If the 100-yr floodplain boundary and cross sections were not identified from the mapping, the floodplain boundary for these segments was digitized between the known upstream and downstream floodplain boundary elevation from adjacent floodplain studiesThe following is a list of table fields and descriptions for the floodplain boundary line feature class:FPS_NUM – floodplain study number issued by CountyPLANDATE – date of the approved floodplain study COMMENTS – additional comments related to the floodplain study or digitization process

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