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ZXNjPkNNWiBwb2x5Z29ucyB3ZXJlIGdlbmVyYXRlZCBieSBtZXJnaW5nIHBvbHlnb24gZGF0YSBm b3IgdGhlICBITVosIEVIQSwgYW5kIEFIWiBsYXllcnMgYW5kIHN1YnRyYWN0aW5nIERNQSBwb2x5 Z29ucyB1c2luZyB0aGUgZXJhc2UgZnVjdGlvbiBpbiBBcmNHSVMuPC9wcm9jZGVzYz4NCiAgICAg IDwvcHJvY3N0ZXA+DQogICAgPC9saW5lYWdlPg0KICA8L2RhdGFxdWFsPg0KPC9tZXRhZGF0YT4= John English DOGAMI Fluvial Geomorphologist 971-673-1557 800 NE Oregon St, Suite 965 Portland Oregon 97232 ArcGIS Metadata 1.0 Don Haines OR Dept. of Geology and Mineral Industries Nature of the Northwest Manager 971-673-2331 800 NE Oregon St. Suite # 965 Portland Oregon 97232 US donald.haines@dogami.state.or.us n/a File Geodatabase Feature Class 0.047 Upper Sandy River Channel Migration Zone (CMZ) 2011-01-01T00:00:00 2013-07-31T00:00:00 Oregon Department of Geology and Mineral Industries John English Fluvial Geomorphologist vector digital data Open-File Report O-13-10, supersedes O-11-13 Channel migration hazard data and maps for a portion of the Sandy River, Multnomah and Clackamas Counties, Oregon <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer represents the Channel Migration Zone along the Sandy River based on analysis designed by Rapp and Abbe, 2003. The Channel Migration Zone (CMZ) represents the cumulative product of historical analysis and morphological interpretations characterized by the following equation: CMZ = HMZ + AHZ + EHA - DMA.</SPAN></P></DIV></DIV></DIV> Conventional flood hazard maps, like the FEMA Flood Insurance Rate Map (FIRM) series, examine only the hazard posed by standing floodwaters on a given floodplain. Damage from bank erosion as river channels naturally migrate may be far greater locally and may occur even in the absence of major flooding. To address this hazard, channel migration hazard maps were created to identify areas susceptible to future channel movement and erosion. Following the methodology of Rapp and Abbe (2003) and Abbe and others (2008), lidar-derived digital elevations models and serial aerial photography were examined to map the position of the channel over time. Localized erosion rates, potential avulsion sites, areas where erosion may be prevented, and areas where infrastructure is at risk from erosion were identified from these data. The resulting Channel Migration Zone and its subzones represent best estimates of the likely hazard projected 100 years into the future. The analysis area is mostly within the geologic floodplain of the river, with some exceptions where forecasted erosion boundaries intersect active landslides. In these locations, the Channel Migration Zone may include the landslide toe. The channel hazard maps should be used as a guide for local governments, land owners, and infrastructure managers to identify assets potentially at risk and to develop effective mitigation measures. For more information on methodologies, see DOGAMI OFR O-11-09, Channel Migration Hazard Maps, Coos County, Oregon. John T. English, Daniel E. Coe, and Robert D. Chappell John English Oregon Department of Geology Fluvial Geomorphologist 971-673-1557 800 NE Oregon St, Suite 965 Portland Oregon 97232 US john.english@dogami.state.or.us Clackamas County Multnomah County Oregon Sandy CMZ channel migration zone ISO 19115 Topic Categories inlandWaters geoscientificInformation CMZ inlandWaters Sandy River Oregon channel migration zone geoscientificInformation Clackamas County Multnomah County This data depicts channel migration zones and associated hazards based on interpretation of serial aerial photography and lidar elevation data. Migration paths/zones and hazard areas were created using methods and protocols defined by Rapp and Abbe (2003). This data cannot serve as a substitute for site-specific investigations by qualified practitioners. Site-specific data may yield results that differ from those shown on this map. This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or survey purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data depicts channel migration zones and associated hazards based on interpretation of serial aerial photography and lidar elevation data. Migration paths/zones and hazard areas were created using methods and protocols defined by Rapp and Abbe (2003). This data cannot serve as a substitute for site-specific investigations by qualified practitioners. Site-specific data may yield results that differ from those shown on this map. This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or survey purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the informationn.</SPAN></P></DIV></DIV></DIV> A framework for delineating channel migration zones: Olympia, Wash. 2003-03-06 Rapp, C.F., and Abbe, T.B. Open-File Report O-11-09 Channel migration hazard maps, Coos County, Oregon 2011-01-01 Oregon Department of Geology and Mineral Industries John T. English and Daniel E. Coe Channel Migration Zone delineation workshop - interpreting fluvial landscapes: Understanding integration between fluvial geomorphology, hydrology, geology, sedimentology and hydraulics, 3-day short course Abbe, T.B., Olson, P.L., Dalby, C., Locke, B., and Williams, K. publication date 2011-01-01 Esri ArcGIS 13.5.0.57366 1 -122.126078 -121.926420 45.389831 45.337207 Data is consistent with previous channel migration studies performed by DOGAMI. Data quality methods are consistent with DOGAMI standard QA/QC processes. Horizontal accuracy was referenced to 2005 NAIP Imagery and represents the average registration accuracy of serial orthophotography used in this study. 6 feet RMSE, 11 feet RMSE @ 95% [ft_us] root mean square error Lidar data from DOGAMI Lidar Data Quadrangles LDQ-2010-45122E3-Washougal and LDQ-2009-45122E4-Camas. Orthophotos of Clackamas and Multnomah Counties (1955, 1956, 1970, and 1971) are from University of Oregon Map Library and (2005 and 2009) National Agricultural Imagery Program (NAIP). CMZ polygons were created using ArcGIS editing and geoprocessing tools. For more information on methodologies, see DOGAMI OFR O-11-09, Channel Migration Hazard Maps, Coos County, Oregon. CMZ polygons were generated by merging polygon data for the HMZ, EHA, and AHZ layers and subtracting DMA polygons using the erase fuction in ArcGIS. 2011-10-01T00:00:00 John English DOGAMI Fluvial Geomorphologist 971-673-1557 800 NE Oregon St, Suite 965 Portland Oregon 97232 CMZ_Study_Areas polygons representing the CMZ DOGAMI Feature Class 0 OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. 009 Shape Geometry 0 0 0 Study_Link Study_Link String 255 0 0 StreamName StreamName String 255 0 0 Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. square feet 009 Shape_Area Double 8 0 0 dataset EPSG 6.12(9.0.0) 0 Simple FALSE 0 TRUE FALSE 20250603