Hydrologic Unit Boundaries, 6th field sub-watershed, Portland Metro Region, Oregon
Dataset Identification:
Resource Abstract:
This geospatial dataset is a hydrologic unit boundary layer for the Sub-watershed (12-digit) level. The dataset is a subset
of the 6th level (field) hydrologic unit boundaries from the Watershed Boundary Dataset (WBD) layer for Oregon. Hydrologic
units in the data set represent drainage areas delineated to the 6th level drainage systems. Their boundaries are defined
by hydrographic and topographic criteria that delineate an area of land upstream from a specific point on a river, stream,
or similar surface waters. Boundaries within the this data set were delineated by Pacific Northwest (PNW) Hydrography Framework
Partners and Natural Resources Conservation Service (NRCS) to meet state requirements and to contribute to the national WBD
repository. To meet these goals, the WBD must adhere to the "Federal Standards for Delineation of Hydrologic Unit Boundaries",
dated October, 2004. These boundaries were made from the Oregon and Washington datasets that have been nationally certified
by Natural Resources Conservation Service (NRCS) Prior to submission the dataset was subjected to an iterative review and
edit process to ensure that the hydrologic boundaries fully satisfy the federal standards. This work was completed under a
Memorandum of Understanding between the Pacific Northwest Hydrography Framework Partnership, NRCS and the US Geological Survey
(USGS). The current dataset includes 6th level boundaries that are in all 4th level (8-digit) subbasins that fall within or
the four county Metro region. This data was originally downloaded from the PNW Hydrography Framework Clearinghouse (http://hydro.reo.gov/hu.html).
<br /> <br /> Downloaded from Metro's <a href="http://rlisdiscovery.oregonmetro.gov/?resourceID=3">RLIS Discovery</a> site
7/2/2012. <br />
Citation
Title Hydrologic Unit Boundaries, 6th field sub-watershed, Portland Metro Region, Oregon