Catchment boundaries derived from terrian data

King County 20061002 One vector digital data King County, WA King County None withheld Catchment boundaries derived from terrian data topo_catchment_mast DRNBASIN is replaced with a higher detail TOPO_CATCHMENT. The difference between the two is DRNBASIN was digitized from existing paper maps based on USGS quad maps in the early 1990s. While the TOPO_CATCHMENT was produced using Arc/Info GRID Watershed commands on 6 foot cell GRIDS built from LIDAR ascii ground model data. Topo_Catchment is higher in accuracy then DRNBASIN Topo_Catchment is the master layer and is dissolved to produce Topo_Basin, Topo_Watershed, and Topo_WRIA by attributes. To replace existing King County Watershed layer DRNBASIN with higher accuracy watersheds based on Lidar. Watersheds delineate areas that water collect and flow out to another waterbody, i.e. a Basin, River, Lake or Sound en 20050601 20061004 publication date Complete As needed Not applicable hydro hydrology none Not applicable King County, WA Pacific NW Washington state None King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County. Victor High King County GIS Center Senior Geographic Systems Analyst Mailing and physical address

201 S Jackson St, Suite 700

Seattle WA 98104 USA 206-263-4845 victor.high@metrokc.gov http://www5.metrokc.gov/sdc/DataImages/topo_catchment.jpg JPG File of layer overlain on base of WA counties or local cities JPG ESRI ArcCatalog 9.2.6.1500 -122.888416 -120.905212 48.479267 46.580925 1141842.375000 1622341.750000 -146455.328000 539611.386000 Feature Class All attributes in DRNBASIN have been transfered to Topo_Catchment except for COUNTY and ACRES. For each HYDROBASIN or TOPO_BASIN, a project area is built in Arc/Info 9.1 using the AML build_dem.aml. This AML builds a 2000 foot buffered Digital Elevation Model, Accumulation, and Slope grids for the basin area using the Bare Earth or Digital Ground Model Lidar grids. Clip existing WTRCRS per DRNBASIN's attribute BASIN_NAME or HYDROBASIN area. Import WTRCRS to a personal geodatabase. For WTRCRS, add field attributes DEPTH (Short, 4) for DEM "Stream Burning" of water courses, RATE (Short, 4) for geometry accuracy rating, and NOTES (Text, 254) for additional information for each line. Create polygon Shapefiles "DEMFIX" and point "PRPT" for each basin. Add field attribute DEPTH (Short, 4) to shapefile "DEMFIX" for DEM "Stream Burning" of water courses. Add attribute "CATCHMENT" (Text, 40) to "PRPT" for joining to existing DRNBASIN Polygon Attribute Table 20061004 ArcGIS Arc/Info 9.1 20061004 08260000 Create Arcmap project per basin and add basin data. Correct WTRCRS geometry using KC and USGS 2002 orthophotos, Lidar products elevation, slope, hillshade, and contours for referance in Arcmap. Place shapefile PRPT Pour Points per existing DRNBASIN catchments. Calc catchment ID to PRPT attribute "CATCHMENT". Add "DEMFIX" polygons as needed to facilitated water flow over obstacles i.e. roads crossing streams and calculate a depth. Export geodatabase WTRCRS to shapefile WTRCRS After the basin WTRCRS is corrected and Pour Points added for each catchment, the AML mk_ws.aml (Make Watershed) is used to produce the catchments for each basin. The mk_ws.aml converts shapefiles WTRCRS, DEMFIX, and PRPT to coverages. The lines of WTRCRS and polygons of DEMFIX are converted to grids. The grids "burn" or subtract cell values for a stream course into the DEM using the DEPTH value to facilitate the correct flow path though the DEM. Fills the DEM for sinkholes, Finds Flow Direction of the DEM, and the Flow Accumulation of cells. The cells with greater than 40,000 cells flowing into them are extracted to grid STRM40KG, then converted to coverage STRM40KG. PRPT coverage is converted to grid, then snaped using Grid command snappour to the STRM40KG grid. The Grid command WATERSHED deliniates the catchement watershed boundaries to grid WSG (Watershed Grid). Grid WSG is converted to coverage WS (Watershed). In ArcEdit, the existing label points in WS are replaced with the PRPT point labels that have the catchment attribute. The WS is polygon rebuilt, then blank attribute polygons are deleted, and duplicate catchments are dissolved by the same catchment ID. The WS coverage is converted to the shapefile: WSC. 20061004 ArcGIS Arc/Info 9.1 All King County WSC shapefile basins are fitted together using ArcGIS ArcToolBox command Integrate at 15 feet tolerance. Basins are merged together using the ArcToolBox Merge command into a GeoDataBase called DRNBASIN_NEW. Topology is created using "No Gaps" and "No Overlaps" rules. All topology errors are fixed in DRNBASIN_NEW. 20061004 ArcGIS Arc/Info 9.1 A copy of bigwater is edited to delete the rivers. An existing old copy of DRNBASIN was updated with the modified bigwater layer using the command UPDATE. The updated DRNBASIN is cleaned up to eliminate slivers between bigwater and dnrbasin. The conflated DRNBASIN to Bigwater is UPDATED with DRNBASIN_NEW, dissolved using the attribute catchment to produce the new drnbasin TOPO_CATCHMENT. TOPO_CATCHMENT is cleaned of slivers, then the 3 child products (Basin, Watershed, and WRIA) are dissolved from topo_catchment. All four levels of topo_catchment are clipped with the King County boundary to produce TOPO_CATCHMENT_KC, TOPO_BASIN_KC, TOPO_WATERSHED_KC, and TOPO_WRIA_KC. 20061004 ArcGIS Arc/Info 9.1 Quality control was done by comparing the original DRNBASIN catchments IDs to the new Topo_Catchment catchment IDs. Any missing catchments were added by using the command UPDATE and then MERGING of the sliver polygons generated from the UPDATE around the polygon. Multi part polygons caused by the original MERGING and UPDATE corrections were EXPLODED then MERGED using DRNBASIN as a guide. withheld 20061017 07275200 20061017 ArcGIS 9.1 Split Upper White River basin into 4 basins: Lower White 100304, Greenwater 10036, Westfork 100305, Upper White stays 100303. Spit Skykomish basin into 6 basins: North Fork 70110, South Fork 70111, Beckler 70113, Miller 70112, Foss 70114, Tye 70115. Corrected Thorton & North Fork Tolt basin boundaries. ARCGIS 9.2 1-16-2008 Dataset copied. withheld 20080812 08203900 Not all Catchment or Sub-Basin polygons have a Identification attribute value. Some catchments outside of King County have no ID value. Not all Basins have Sub-Basins. Topo_Catchment replaces DRNBASIN completely. The area that was updated is King County's Lidar extent. This includes all of King County and Basins in Snohomish that are part of the Lake Washington - Cedar Watershed. FEATURE_ID 1 1512 1 Unique Identification Number OBJECTID FEATURE_ID Integer 4 10 0 topo_catchment_area ESRI Feature Class 1543 Shape Feature Geometry ESRI Coordinates defining the features SUB_BASIN String 40 0 0 SUB_BASIN Unique ID for Sub-Basins Subornate Basin of Basin DRNBASIN String 40 CATCHMENT 0 0 CATCHMENT Unique Catchment Name Smallest Basin Division in Watershed Hierarchy DRNBASIN Geometry 4 Shape 0 0 OBJECTID BASIN_NAME String 50 0 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE WRIA_NO SmallInteger 2 Feature geometry. ESRI Coordinates defining the features. 5 0 WRIA_NO Shape.STArea() Double 0 0 0 Shape.STArea() Shape.STLength() Double 0 0 0 Shape.STLength() WRIA_NAME String 50 0 0 WRIA_NAME WTRSHD_NAME String 50 0 0 WTRSHD_NAME OBJECTID OID 4 10 0 Feature geometry. ESRI Coordinates defining the features. The existing DRNBASIN, and it's child products HYDROBASIN, WATERSHED, and WRIA are being updated using King County's 2002 Lidar data. The new layers will be: TOPO_CATCHMENT, TOPO_BASIN, TOPO_WATERSHED, and TOPO_WRIA. The attributes will remain the same except for fields COUNTY and ACRES. The attribute COUNTY that delineates which county a catchment belongs to will be deleted from the 4 TOPO products. To replace the deleted attribute COUNTY, there will be 4 new layers that are clipped to the King County Boundary: TOPO_CATCHMENT_KC, TOPO_BASIN_KC, TOPO_WATERSHED_KC, and TOPO_WRIA_KC. The attribute ACRES will be also be deleted. The rebuilding of DRNBASIN was done at the same time as Phase1 WTRCRS redevelopment. The corrected WTRCRS was used to "Stream Burning" a path in the Digital Ground Model (DGM) to facilitate the correct stream path through the cells of the DGM. Without stream burning, the DGM can produce errors in flow direction due to elevation anomalies. When the WTRCRS was completed per basin, the catchment watersheds were rebuilt to HYDROBASIN extents. Topo_Catchment contains all the attributes that are dissolved to form the 3 child layers: Topop_Basin, Topo_Watershed, and Topo_WRIA. Cheryl Wilder KCGIS Center Data Sales Coordinator Mailing and physical address

201 S Jackson St, Suite 700

Seattle WA 98104 USA 206-263-5220 /plibrary2/hydro/shapes/polygon/topo_catchment.shp King County disclaims any warranty of use of any digital product or data beyond that for which it was designed. ESRI Shapefile 0.000 0.000 withheld Not available CD or DVD Read-only media, if offline Contact KCGIS Client Services for the cost of reproduction - http://www.metrokc.gov/gis/services/index.htm 20081226 King County GIS Center Chris Jansen Client Services Production Coordinator Mailing and physical address

201 S Jackson St, Suite 700

Seattle WA 98104 USA 206-263-4866 firstname.lastname@metrokc.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 en local time 20260331 14170100 20200707 17261500 FALSE 20260331 14170100 topo_catchment_area 002 1141842.375000 1622341.750000 -146455.328000 539611.386000 1 Projected GCS_North_American_1983_HARN Linear Unit: Foot_US (0.304801) NAD_1983_HARN_StatePlane_Washington_North_FIPS_4601_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS["NAD_1983_HARN_StatePlane_Washington_North_FIPS_4601_Feet",GEOGCS["GCS_North_American_1983_HARN",DATUM["D_North_American_1983_HARN",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1640416.666666667],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-120.8333333333333],PARAMETER["Standard_Parallel_1",47.5],PARAMETER["Standard_Parallel_2",48.73333333333333],PARAMETER["Latitude_Of_Origin",47.0],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2926]]</WKT><XOrigin>-117104300</XOrigin><YOrigin>-99539600</YOrigin><XYScale>4000</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.002</XYTolerance><ZTolerance>2</ZTolerance><MTolerance>2</MTolerance><HighPrecision>true</HighPrecision><WKID>2926</WKID><LatestWKID>2926</LatestWKID></ProjectedCoordinateSystem> 1.0 FGDC CSDGM Metadata ItemDescription 150000000 5000 20260331 Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362 Catchment boundaries derived from terrian data 1141842.375 1622341.75 539611.386 -146455.328 1 -122.888416 -120.905212 48.479267 46.580925 1 1 -122.888416 -120.905212 48.479267 46.580925 Drainage area delineations are drainage areas at the smallest scale derived from terrain data. For more information about this layer please see the <a href='https://www5.kingcounty.gov/sdc?Layer=TOPO_CATCHMENT_AREA' rel='nofollow ugc'>GIS Data Catalog</a>.<br /><br />These are drainage area delineations that generally define drainage areas at scale similar to neighborhoods. However, the size of drainage areas is highly variable for this layer. The variability in size of defined areas is usually driven by stormwater needs for a given municipality, capital improvement project, etc. They can be defined based on complex stormwater conveyances as well. This is the finest scale of drainage areas that KC currently has for county wide. The County has been undergoing updated mapping of drainage basins taking into account conveyances that may not be fully topographically driven. For example underground stormwater water pipes may direct flows counter to surface topography. This is an ongoing effort conducted by King County and various collaborating partners. hydrohydrologynoneTOPO_CATCHMENT_AREA (339)_AREA King County data are made available with the understanding that they shall be used exclusively by the obtainer or their authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County. ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld 0.000 Feature Class Feature Class Vector Simple FALSE 1543 TRUE FALSE GCS_North_American_1983_HARN NAD_1983_HARN_StatePlane_Washington_North_FIPS_4601_Feet coordinate pair survey feet 0.000250 0.000250 D_North_American_1983_HARN Geodetic Reference System 80 6378137.000000 298.257222 Explicit elevation coordinate included with horizontal coordinates 1.000000 North American Vertical Datum of 1988 feet NAD_1983_HARN_StatePlane_Washington_North_FIPS_4601_Feet EPSG 8.9.3(9.0.0) 1543