Metadata: Drainage Classes (wet)

Drainage Classes (wet)

Category Environmental
Feature Dataset Name Stand-Alone
Item Name swmm_drain_classes_wet_bes_pdx
Database Type SDE
Originator City of Portland
Bureau Bureau of Environmental Services
Publication Date 01/01/1900
Abstract The Wetted Drainage Class and Hydrologic Soil Group maps are based on soil classifications that approximate saturation frequency and duration and also estimate runoff potential. The Sump Capacity Data by Quarter Section map is based on sump infiltration data collected and compiled by the City of Portland.

"Drainage class (natural)" refers to the frequency and duration of wet periods under conditions similar to those under which the soil formed. Alterations of the water regime by human activities, either through drainage or irrigation, are not a consideration unless they have significantly changed the morphology of the soil. Seven classes of natural soil drainage are recognized-excessively drained, somewhat excessively drained, well drained, moderately well drained, somewhat poorly drained, poorly drained, and very poorly drained. These classes are defined in the Soil Survey of Multnomah County, Oregon; 1983.

Purpose Mapping and analysis of characteristics related to soil and drainage in the Portland area.
Supplemental Information
Last Dataset Update 10/01/2013 17:55
Last Source Update 01/01/1900 00:00
Maintenance/Update Frequency Unknown
Extent Clackamas County, Multnomah County, and Washington County, Oregon
Data Type Vector
Shape Type Polygon
Feature Count 2995
Horizontal Position Accuracy
Horizontal Position Accuracy Link Taxlots
Progress Complete
North Bounding Coordinate 46.08065859
South Bounding Coordinate 44.85462409
East Bounding Coordinate -121.65053671
West Bounding Coordinate -123.47121656
Theme Keyword(s)
Theme Keyword Thesaurus
Place Keyword(s) Portland, Multnomah County, Washington County, Clackamas County, Oregon
Place Keyword Thesaurus
Access Constraints Available for Public Use
Use Constraints These data are distributed under the terms of the City of Portland Data Distribution Policy. Care was taken in the creation of this data but it is provided "as is".

The City of Portland cannot accept any responsibility for errors, omissions, or positional accuracy.
Source Dataset Type Enterprise Geodatabase
Output Geodatabase EGH_Public
Distribution Grid: State plane coordinate system 1983(91).
Units: International feet
Datum: North American Datum of 1983/1991 (HPGN)
Liability: The information in this file was derived from digital databases on the City of Portland GIS. Care was taken in the creation of this file. The City cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied.
Format: Shapefile or File Geodatabase Feature Class - Data will be provided via City of Portland FTP Site.
Online Resource:
Online Instructions: City of Portland Public/Open Data is distributed via the PortlandMaps Open Data Site - Data not available on the PortlandMaps Open Data site can be requested by contacting the City of Portland CGIS Group -
Transfer Size: varies
SPCS Zone Identifier: 5076
Bureau of Environmental Services
503 823-3132
1120 SW Fifth Ave, Suite #600
Portland, OR 97204

City of Portland - BES
503 823-3132
503 823-3132
53710.png 82.70Kb X

Attribute Tables & Domains

Table Description
Table Jurisdiction
Column Sort Column Name Column Alias Column Type Column Size Domain Value(s) Column Description
1 SHAPE.area Numeric 0
1 SdvSoilMapLayer7_AREASYMBOL String 20
1 SdvSoilMapLayer7_SPATIALVER Numeric 8
1 SdvSoilMapLayer7_MUSYM String 6
1 SdvSoilMapLayer7_MUKEY String 30
1 MUKEY String 10
1 DrainClass String 255