Service Description: This datasets provides watershed and subwatershed mapping for Pierce County. Read metadata for more information.
Service ItemId: 12613238be504084b4a3652b604fdd13
Has Versioned Data: false
Max Record Count: 1000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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Description: The County’s National Pollutant Discharge Elimination System and State Waste Discharge General Permit (NPDES) permit requires that Pierce County maintain mapping data for all known MS4 outfalls and discharge points. The permit requires basin delineation for all tributary conveyances to all known outfalls and discharge points with a 24-inch nominal diameter or larger, or an equivalent cross-sectional area for non-pipe systems.In September 2016, Pierce County Department of Public Works (County) hired Herrera Environmental Consultants (Herrera) to delineate watershed and drainage basin boundaries in GIS to meet the mapping requirements of the current NPDES Phase I Municipal Stormwater Permit. In 2017, Herrera produced an amendment to the original SOW to assist the County with a) conducting a review of 570 existing mapped outfall and discharge points for accuracy and completeness and b)mapping all remaining outfall and discharge points within Pierce County (excluding cities).Herrera has produced a Technical Memorandum documenting all methods and results entitled “Pierce County Drainage Basin and Watershed Delineation Summary Memorandum” (dated December 28, 2017). Please read metadata for additional information (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbswm_watersheds_hec.html). Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
Copyright Text:
Spatial Reference: 2927 (2927)
Initial Extent:
XMin: 1049757.08189794
YMin: 552812.62930665
XMax: 1431837.88460206
YMax: 851232.398461556
Spatial Reference: 2927 (2927)
Full Extent:
XMin: 1059049.4675
YMin: 491987.843199998
XMax: 1422545.499
YMax: 793465.513300002
Spatial Reference: 2927 (2927)
Units: esriFeet
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