Metadata: Identification_Information: Citation: Citation_Information: Originator: R.C. Wilson Originator: A.S. Jayko Publication_Date: 1997 Title: San Francisco Bay Region Landslide Folio Part E - Map of debris-flow source areas in the San Francisco Bay region, California Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 97-0745-F Other_Citation_Details: ARC/INFO vector COVERAGE format (<1MB for entire region) and raster GRID format (21MB). Plotfiles in PostScript also available. Online_Linkage: http://pubs.usgs.gov/of/1997/of97-745/of97-745f.html Description: Abstract: These maps show, for emergency service managers in the San Francisco Bay region, the threshold rainfall that may be capable of triggering a level of debris-flow activity likely to threaten public safety. The maps are products of a continuing series of studies that began after a catastrophic storm on January 3-5, 1982 triggered 18,000 debris flows in the San Francisco Bay region, causing 25 deaths and $66 million in property damage. The threshold rainfall values were estimated by re-evaluating a previous empirical analysis of data from the 1982 storm, and other historical rainfall records, that normalized the rainfall intensity data by dividing by the mean annual precipitation (MAP) of the corresponding rain gage. The present analysis also takes into account the rainfall frequency, the mean annual number of days with non-zero rainfall (#RDs), thereby adjusting for the difference in rainfall frequency between windward-facing slopes where rainfall is orographically enhanced and leeward-facing slopes and valleys that lie within rain shadows where precipitation is reduced. The debris-flow threshold maps were created by digitally combining an existing regional map of mean annual precipitation, a newly compiled data set of #RDs from an analysis of long-term (20-40 years) records of daily rainfall for 33 rain gages in the region, and the re-normalized thresholds from the empirical analysis of historical storm data. Purpose: The primary intended use of these maps is to facilitate response planning for debris-flow related emergencies. The maps are intended to be used in conjunction with the debris-flow susceptibility map developed by Ellen and Mark (1997) in this same series. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.678 East_Bounding_Coordinate: -120.975 North_Bounding_Coordinate: 38.888 South_Bounding_Coordinate: 36.85 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geology Theme_Keyword: geologic maps Theme_Keyword: landslides Theme_Keyword: surficial geologic units Theme_Keyword: geologic history Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: National Geologic Map Database Catalog themes, augmented Theme_Keyword: 3400 - Graphical Theme_Keyword: 3100 - Vector Theme_Keyword: 3420 - PostScript Theme_Keyword: 3110 - ESRI Theme_Keyword: 3112 - export Theme_Keyword: 3200 - Raster Theme_Keyword: 1500 - Hazards Theme_Keyword: 1503 - Landslides Theme_Keyword: 3220 - Grid Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Categories Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4 Place_Keyword: f06001 = Alameda Place_Keyword: f06013 = Contra Costa Place_Keyword: f06041 = Marin Place_Keyword: f06055 = Napa Place_Keyword: f06085 = Santa Clara Place_Keyword: f06087 = Santa Cruz Place_Keyword: f06075 = San Francisco Place_Keyword: f06081 = San Mateo Place_Keyword: f06095 = Solano Place_Keyword: f06097 = Sonoma Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jayko, Angela S Contact_Organization: USGS-GEO-WRG-NGM Contact_Address: Address_Type: mailing and physical address Address: Mail Stop 975, USGS 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: US Contact_Voice_Telephone: 650-329-4926 Contact_Electronic_Mail_Address: ajayko@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rt6.pdf Browse_Graphic_File_Description: PDF representation of the map of 6-hour rainfall thresholds (1.1 megabytes) Browse_Graphic_File_Type: PDF Data_Set_Credit: We thank Todd Fitzgibbon for digital review, and Russ Graymer and Scott Graham for cartographic assistance. Native_Data_Set_Environment: ARC/INFO version 7.0.4 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: entity point SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: complete chain Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -123 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: unknown Ordinate_Resolution: unknown Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: SFBR-RT24C.AAT Entity_Type_Definition: 24 hour rainfall threshold value Entity_Type_Definition_Source: OFR-97-0745-F Attribute: Attribute_Label: COUNTOUR Attribute_Definition: Contour of rainfall threshold Attribute_Definition_Source: OFR-97-0745-F Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.000 Range_Domain_Maximum: 10.500 Attribute_Units_of_Measure: inches Attribute_Measurement_Resolution: 0.001 Detailed_Description: Entity_Type: Entity_Type_Label: SFBR-RT6C.AAT Entity_Type_Definition: 6 hour rainfall threshold value Entity_Type_Definition_Source: OFR-97-0745-F Attribute: Attribute_Label: COUNTOUR Attribute_Definition: Contour of rainfall threshold Attribute_Definition_Source: OFR-97-0745-F Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.000 Range_Domain_Maximum: 6.000 Attribute_Units_of_Measure: inches Attribute_Measurement_Resolution: 0.001 Detailed_Description: Entity_Type: Entity_Type_Label: SFBR-RTG.PAT Entity_Type_Definition: Point coverage showing rain gage locations, station identifier, average number of rainy days, and mean annual precipitation Entity_Type_Definition_Source: OFR-97-745-F Attribute: Attribute_Label: LOCATION Attribute_Definition: Feature name Attribute_Definition_Source: OFR-97-745-F Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Santa Cruz Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Ben Lomond 4 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Antioch Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Berkeley Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Black Mnt 2WSW Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Calaveras Res. 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Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Wrights Attribute: Attribute_Label: RAINDAYS Attribute_Definition: Mean annual number of rainy days Attribute_Definition_Source: OFR-97-0745-F Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 64.1 Range_Domain_Maximum: 95.0 Attribute_Units_of_Measure: days Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: MAP Attribute_Definition: Mean Annual Precipitation Attribute_Definition_Source: OFR-97-745-F Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 12.38 Range_Domain_Maximum: 56.25 Attribute_Units_of_Measure: inches Attribute_Measurement_Resolution: 0.01 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Information Services Contact_Address: Address_Type: mailing Address: Box 25286, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80255-0046 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Facsimile_Telephone: 1-303-202-4695 Contact_Electronic_Mail_Address: infoservices@usgs.gov Resource_Description: US Geological Survey Open-File Report 97-0745-F Distribution_Liability: This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This database, identified as "Preliminary Maps Showing Rainfall Thresholds for Debris-Flow Activity, San Francisco Bay Region, California," has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE Format_Version_Number: 7.x Format_Information_Content: >ARC/INFO export file Description of Coverage > >sfbr-rt24c.e00 Line coverage showing contours of 24 hour rainfall threshold for debris flows. >sfbr-rt6c.e00 Line coverage showing contours of 6 hour rainfall threshold for debris flows. >sfbr-rtg.e00 Point coverage showing rain gage locations, station identifier, average number of rainy days, and mean annual precipitation. >sfbr-rta.e00 Point coverage showing the location of ALERT STATIONS and station identifiers File_Decompression_Technique: gzip -d Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rta.e00.gz Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rtg.e00.gz Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rt6c.e00.gz Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rt24c.e00.gz Digital_Form: Digital_Transfer_Information: Format_Name: ArcInfo Grid Format_Version_Number: 7.x Format_Information_Content: >ARC/INFO GRIDS (Tar) Description of GRID files > >sfbr-rt24.tar Arc/Info grid showing 24 hour rainfall threshold for debris flows >sfbr-rt6.tar Arc/Info grid showing 6 hour rainfall threshold for debris flows File_Decompression_Technique: gzip -d Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rt6.tar.gz Network_Resource_Name: http://pubs.usgs.gov/of/1997/of97-745/sfbr-rt24.tar.gz Fees: none Metadata_Reference_Information: Metadata_Date: 20160614 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Peter N Schweitzer Contact_Organization: USGS Midwest Area Contact_Position: Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/ Contact_Address: Address_Type: mailing address Address: Mail Stop 954 12201 Sunrise Valley Dr City: Reston State_or_Province: VA Postal_Code: 20192-0002 Country: USA Contact_Voice_Telephone: 703-648-6533 Contact_Facsimile_Telephone: 703-648-6252 Contact_Electronic_Mail_Address: pschweitzer@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998