Theme: Basin Boundary This layer was clipped from Klamath National Forest Watersheds Coverage below: Klamath National Forest Geographic Information System Theme Documentation Revision Date: November 1996 Theme: Hydrologic watersheds File Pathname: /fsfiles/ref/library/gis/klamath/hydro/watersheds Disclaimer: *********************************************************************- **** The Klamath National Forest cannot assure the reliability or suitability of this information for a particular purpose. Original data was compiled from various sources. Spatial information may not meet National Map Accuracy Standards. This information may be updated without notification. ***********************************************- ************************* Project Name: KNF Base Layer IDENTIFICATION INFORMATION Coverage Extent: Forest-wide Source: 1:24000 manuscripts provided by Mark Reichert, Klamath National Forest Last Update: January 1997 Primary Feature Type:Polygon Other Feature Types: Distribution Limitations: None Data Resolution: 1:24000 Projection: UTM Zone 10 Comments: Boundaries for watersheds encompassing the Klamath National Forest down to the seventh field, about 5,000 to 15,000 acres in size. This coverage includes an attempt to crosswalk the national system of watershed delineation, based on USGS Hydrologic Unit Codes (HUCs), with the CALWATER delineations. Included in the polygon attribute table are columns "Idnum", "Region", "Hu", "Ha", "Hsa", "Spws", and "Pws". These are all CALWATER identifiers. "Idnum" is the primary CALWATER identifier with the rest derivations of "Idnum". Because CALWATER stops at the Oregon state line, all "Idnum"s north of the state line are "0.0000". The crosswalk from CALWATER to the Hydrologic Unit Code system is a proposal and not the current CALWATER system. The column "Seventh_field" is the primary identifier for this layer. There are a few cases where more than one polygon contains the same "Seventh_field" identifier. In each of these cases, the reason is to maintain consistency with CALWATER. For instance, one "Seventh_field" HUC polygon on both sides of the California/Oregon state line will be two polygons in this coverage due to two "Idnum"s, one being "0.0000". Also some larger areas, such as the Lower Klamath Lake fifth field watershed, are not subdivided into seventh field HUCs in this coverage but do contain many smaller CALWATER polygons. The entire CALWATER coverage has not been accepted into the HUC system in this coverage due to difficulty in collaborating lines. The "watersheds" coverage also contains the columns "Seventh_field_na", "Fifth_field", "Third_field", "Fourth_field", and 'Sixth_field". The third through sixth field identifiers are derived from the seventh field identifier by lumping the appropriate digits. For instance, the seventh field watershed "18010205020103" is part of the sixth field "180102050201", the fifth field "1801020502", the fourth field "18010205", and the third field "180102". "Seventh_field_na" is a name for the seventh field watersheds, used to help locate a watershed on a map but not necessarily unique in the coverage. Corresponding names also exist for the third through sixth field watersheds but in a separate data table. SOURCE INFORMATION Source System: Arc/Info Source Scale: 1:24000, except as noted below under "Theme Generation" Source Projection: UTM Zone 10 Capture Method: ? CUSTODIAN INFORMATION Contact Organization:KNF Supervisor's Office Resource Contact: ? Phone:916-842-6131 Email: Address: 1312 Fairlane Road Yreka, CA 96097 GIS Contact: Dianne Torpin, KNF Supervisor's Office, GIS Staff Phone:916-842-6131 Email: Address: 1312 Fairlane Road Yreka, CA 96097 PROCESSING INFORMATION Theme Generation: Most of the polygons are digitized at the 1:24,000 scale and double-checked for accuracy. However in the Shasta Valley and Butte Valley areas, within the extent of this coverage but outside of Klamath National Forest lands, some arcs are CALWATER lines not double-checked. A few other lines in these areas are digitized at the 1:100,000 scale. Lineage: For more detailed information, see the Edit Log for this theme. ATTRIBUTE INFORMATION =====================================================================- == System Software: Arc/Info Table Name:.PAT ============================================ Item Name: seventh_field Item Type: char Item Length: 14 Item Value Description eg. 18010204080000 Seventh-field watershed identifier Item Name: seventh_field_na tem Type: char Item Length: 1 Item Value Description eg. Grizzly Butte Reach Klamath River Descriptive name; not necessarily unique tem Name: sixth_fieldItem Type: char, redefinedItem Length:12 Item Value Description eg. 180102040800 Sixth-field watershed identifier tem Name: fifth_fieldItem Type: char, redefinedItem Length:10 Item Value Description eg. 1801020408 Fifth-field watershed identifier tem Name: fourth_fieldItem Type: char, redefinedItem Length:8 Item Value Description eg. 18010204 Fourth-field watershed identifier tem Name: third_fieldItem Type: char, redefinedItem Length:6 Item Value Description eg. 180102 Third-field watershed identifier