Map of debris flows caused by rainfall during 1996 in parts of the 
Reedsport and Deer Head Point quadrangles, Douglas County,southern Coast Range, Oregon

By Jeffrey A. Coe,1 John A. Michael,1 and Marianella M. Burgos2

1U.S. Geological Survey, MS 966, Denver Federal Center, Denver, Colo. 80225
2University of Puerto Rico, Mayaguez, Puerto Rico

2011

U.S. Geological Survey Open_File Report 2011-1150

ABSTRACT
This 1:12,000-scale map shows an inventory of debris flows caused by rainfall 
during 1996 in a 94.4 km2 area in the southern Coast Range of Oregon. This map 
and associated digital data are part of a larger U.S. Geological Survey study 
of debris flows in the southern Coast Range. Available evidence indicates that 
the flows were triggered by a rain storm that occurred between November 17 and 
19.  The closest rain gage in the Coast Range (Goodwin Peak) recorded 245 mm 
during the storm. Maximum rainfall intensity during the storm was 13.2 mm/hr on 
November 18. Debris flows were photogrammetrically mapped from 1:12,000-scale 
aerial photographs flown in May, 1997. The inventory is presented on imagery 
derived from LiDAR data acquired in 2008. We classified mapped debris flows 
into four categories based on the type of debris-flow activity: (1) discrete 
slide source areas, (2) predominantly erosion, (3) predominantly transport or 
mixed erosion and deposition, and (4) predominantly deposition. Locations of 
woody-debris jams are also shown on the map. The area encompassed by debris 
flows is 2.1 percent of the 94.4 km2 map area

DISCLAIMERS
Any use of trade, product or firm names is for descriptive purposes only and does 
not imply endorsement by the U.S. Geological Survey.

Although this information product, for the most part, is in the public domain, 
it also contains copyrighted material as noted in the text.  Permission to 
reproduce copyrighted items for other than personal use must be secured from 
the copyright owner.

This database, identified as Open-File Report 2011-1150, 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.

CONTENTS
List of files available for download:

OF11-1150_pamphlet.pdf
OF11-1150_map.pdf
00Readme.txt

1150lidarelev.met -- metadata for the grid represented on the map
1150lidarelev.zip:
    1150lidarelev.e00 -- ArcInfo export file of grid showing bare-earth 
        surface elevations represented on sheet1 as a hillshade

1150DebrisFlowPolygons.met -- metadata for the shapefile represented on the map 
1150DebrisFlowPolygons.zip:
    1150DebrisFlowPolygons.shp -- vector shapefile representing debris flows 
      shown on the map
    1150DebrisFlowPolygons.shx
    1150DebrisFlowPolygons.sbn
    1150DebrisFlowPolygons.sbx
    1150DebrisFlowPolygons.prj
    1150DebrisFlowPolygons.dbf
    1150DebrisFlowPolygons.shp.xml

1150WoodyDebrisJam.met -- metadata for the shapefile represented on the map 
1150WoodyDebrisJam.zip:
    1150DebrisFlowPolygons.shp -- vector shapefile representing woody-debris 		jams 
      shown on the map
    1150WoodyDebrisJam.shx
    1150WoodyDebrisJam.sbn
    1150WoodyDebrisJam.sbx
    1150WoodyDebrisJam.prj
    1150WoodyDebrisJam.dbf
    1150WoodyDebrisJam.shp.xml

1150MappingExtent.met -- metadata for the shapefile represented on the map 
1150MappingExtent.zip:
    1150MappingExtent.shp -- vector shapefile representing the entent of 		mapping for the debris flows shown on the map
    1150MappingExtent.shx
    1150MappingExtent.sbn
    1150MappingExtent.sbx
    1150MappingExtent.prj
    1150MappingExtent.dbf
    1150MappingExtent.shp.xml

INSTRUCTIONS AND DOCUMENTATION FOR U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 2011-1150

The database can be downloaded via the Web from http://pubs.usgs.gov/of/2011/1150/. 
Some files and folders may be extracted from compressed zip files. In addition, an Adobe
Portable Document Format (PDF) file (OF11-1150_pamphlet/map.pdf) can be downloaded,
from which paper copies may be printed and requires Adobe Acrobat for viewing.
Acrobat software runs on a variety of systems, and is available for download 
free of charge from Adobe at: http://www.adobe.com. 

ArcInfo export files and ArcGIS shapefiles may be extracted after download from WinZip 
compressed files.  Use WinZip (http://www.winzip.com/) or other programs to extract and 
decompress the files.