Potential Flood Hazard Review

Metadata:

Identification_Information
Spatial_Data_Organization_Information
Entity_and_Attribute_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:Pierce County Planning and Public Works - Surface Water Management
Publication_Date: 2019-01-16
Title:
Geospatial_Data_Presentation_Form:vector digital data

Description:

Abstract:: Potential flood hazard areas are a trigger for review to account for the inherent mapping errors in the flood hazard data. Some of the areas indicated to be at a high risk of flooding were drawn using five-foot contours based on planimetric data from the 1990s. In relatively flat regions the horizontal error from where the maps indicates a flood hazard to end the true low area could be as much as 150 feet. To ensure that development is built in accordance with the Flood Hazard Area PCC 18E.70 a buffer is added to areas know to be areas of frequent flooding. These include: Detailed Study Areas, FEMA Flood Insurance Rate Map-FIRM A zones and V zones; Areas within 150 feet horizontal distance from the mapped A and V zones; Unstudied A zones and X (Shaded) zones and areas within 150 feet horizontal distance from the mapped areas of the mapped A and X (Shaded) zones, excluding X (shaded) that are classified by a detailed flood study as 0.2% annual chance flood area; Areas within 65 feet horizontal distance from an identified natural watercourse; areas 150 feet horizontal distance from a mapped waterbody; and adopted Channel Migration Zones. In some areas the 150 foot horizontal distance from a detailed study area has been reduced where an analysis of LIDAR data indicated high ground to be reasonably safe from flooding.In cases where a review of current topography can assure a proposed project is reasonably safe from flooding the county is able to waive requirements for additional flood studies or surveys.Updated 12/12/2018 edited buffers to reflect update to the Hydro dataset
Purpose:: The purposes stated from "Development Regulations - Critical Areas (Title 18E)" are as follows: A. Protect human life and health; B. Minimize expenditure of public money and costly flood control projects; C. Minimize the need for rescue and relief efforts associated with flooding; D. Minimize prolonged business interruptions; E. Minimize damage to public infrastructure, facilities and utilities; F. Minimize damage to critical fish and wildlife habitat areas; G. Minimize net loss of ecological functions of floodplains; H. Ensure that potential buyers are notified that property is in a flood hazard area; I. Ensure that those who occupy flood hazard areas assume responsibility for their actions; and J. Qualify Pierce County for participation in the National Flood Insurance Program, thereby giving the citizens of Pierce County the opportunity to purchase flood insurance with particular emphasis to those in flood hazard areas.
Supplemental_Information:: This theme may not include all potential flood hazard areas that may be necessary for a specific site analysis. The Department may make interpretations, where needed, as to the approximate location of the boundaries of potential flood hazard areas. Where the Flood Insurance Study, FIRM, and floodway maps do not provide adequate, best, or most recent information, flood information that is more accurate or detailed may be used. When there is a conflict between the elevations and the mapped potential flood hazard area boundaries, the elevations shall govern. Where there is insufficient information shown on the Critical Areas Atlas-Flood Hazard Areas Maps, the Department may require the applicant to verify that the site is out of the flood hazard area using the flood hazard area review procedures set forth in Section 18E.70.030.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 2017-03-15
Ending_Date: 2018-12-14

Currentness_Reference:

See Range_of_Date/Times

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:-122.851245
East_Bounding_Coordinate:-121.586112
North_Bounding_Coordinate:47.420851
South_Bounding_Coordinate:46.723240

Keywords:

Theme:

Theme_Keyword_Thesaurus:None
Theme_Keyword:Unstudied Areas
Theme_Keyword:Potholes
Theme_Keyword:Washington
Theme_Keyword:Flood Hazard
Theme_Keyword:Detailed Study Areas
Theme_Keyword:Natural Watercourse
Theme_Keyword:Groundwater Flooding Areas
Theme_Keyword:Channel Migration Zones
Theme_Keyword:FEMA
Theme_Keyword:Pierce County

Access_Constraints:None

Use_Constraints:

All users of this data should read through the metadata and the Pierce County GIS Data Terms of Use.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Pierce County Planning and Public Works - Surface Water Management
Contact_Person: Dennis Dixon

Contact_Position: Civil Engineer 2

Contact_Address:

Address_Type: physical
Address: Tacoma Mall Plaza Suite 109

Contact_Voice_Telephone: 253-798-3696

Contact_Electronic_Mail_Address: dennis.dixon@piercecountywa.gov

Data_Set_Credit:

Edits to the dataset are made by Pierce County Surface Water Management.

Native_Data_Set_Environment:

Microsoft Windows Server 2016 Technical Preview Version 10.0 (Build 17763) ; Esri ArcGIS 12.9.2.32739

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method:Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type:GT-polygon composed of chains
Point_and_Vector_Object_Count:11904

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:Pierce_GDB.WTRPRG.Potential_Flood_Hazard_Areas

Attribute:

Attribute_Label:OBJECTID

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

Esri

Attribute_Domain_Values:

Unrepresentable_Domain:: Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label:Shape

Attribute_Definition:

Feature geometry.

Attribute_Definition_Source:

Esri

Attribute_Domain_Values:

Unrepresentable_Domain:: Coordinates defining the features.

Attribute:

Attribute_Label:Floodplain
Attribute_Definition:: A 150 foot buffer from the mapped A and V zones; Unstudied A zones and X (Shaded) zones and areas within 150 feet horizontal distance from the mapped areas of the mapped A and X (Shaded) zones, excluding X (shaded) that are classified by a detailed flood study as 0.2% annual chance flood area In some areas the 150 foot horizontal distance from a detailed study area has been reduced where an analysis of LIDAR data indicated high ground to be reasonably safe from flooding.

Attribute:

Attribute_Label:Waterway
Attribute_Definition:: A 65 foot buffer based on the 'Hydro - Centerlines' Dataset A 150 foot buffer based on 'Hydro - Waterbodies' Dataset

Attribute:

Attribute_Label:CMZ
Attribute_Definition:: Identifies if Channel Migration Zone is present

Attribute:

Attribute_Label:Shape.STArea()

Attribute:

Attribute_Label:Shape.STLength()

Metadata_Reference_Information:

Metadata_Date:20220909

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Pierce County Planning and Public Works - Surface Water Management
Contact_Person: Dennis Dixon

Contact_Position: Civil Engineer 2

Contact_Address:

Address_Type: physical
Address: Tacoma Mall Plaza Suite 109

Contact_Voice_Telephone: 253-798-3696

Contact_Electronic_Mail_Address: dennis.dixon@piercecountywa.gov

Metadata_Standard_Name:FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version:FGDC-STD-001-1998

Metadata_Time_Convention:local time

Metadata_Use_Constraints:

All users of this data should read through the metadata and the Pierce County GIS Data Terms of Use.