{"action":"create","ckan_id":null,"date_created":"Tue, 31 Mar 2026 00:04:31 GMT","date_finished":null,"harvest_job_id":"52d231e5-aff4-4efa-8a30-b235ca584dc9","harvest_source_id":"4c62556f-0fa3-402d-90f6-6a46cd80a117","id":"1bbc8cba-e5fb-4844-b3b0-da89e5ab1f6d","identifier":"https://hazards.fema.gov/filedownload/metadata/R10/631095-PerformFloodplainMapping.xml","parent_identifier":null,"source_hash":"deb048955534618ecbb3791838b9e4087c56e4be1a7dea1c6c9272f696ba3e50","source_raw":"\n\n \n \n \n Oregon Department of Geology and Mineral Industries (DOGAMI)\n 20100407\n Floodplain Redelineation Submission for Coos County OR\n FEMA-DFIRM-Redelineation\n \n Portland, Oregon, USA\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n http://www.oregongeology.org/\n \n \n Federal Emergency Management Agency\n Unknown\n FEMA CASE 09-10-0842S\n \n \n \n \n \n The Floodplain Mapping/Redelineation study deliverables depict and quantify the flood risks for the study area. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The Floodplain Mapping/Redelineation flood risk boundaries are derived from the engineering information Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA).\n The objective of the Floodplain Mapping/Redelineation data submission is to archive the flood boundary and redelineation data for a study in a database such that it can be revised and used with minimum effort in future flood insurance studies or map revisions. This digital data is produced for the purposes of updating/creating a DFIRM database.\n \n \n \n \n 20100407\n \n \n MIP Submission Date\n \n \n In work\n Unknown\n \n \n \n -124.508198\n -123.744869\n 43.628931\n 42.830570\n \n \n \n \n ISO 19115 Topic Category\n hydrology\n environment\n inlandWaters\n \n \n FEMA NFIP Topic Category\n Floodplain Mapping\n Redelineation\n DFIRM\n FIRM\n FEMA Flood Hazard Zone\n DFIRM Database\n Special Flood Hazard Area\n Digital Flood Insurance Rate Map\n CBRS\n Coastal Barrier Resources System\n Riverine Flooding\n Coastal Flooding\n NFIP\n Base Flood Elevation\n SFHA\n Flood Insurance Rate Map\n Floodway\n \n \n None\n REGION 10\n STATE OR\n COUNTY COOS\n COUNTY-FIPS 41011C\n COMMUNITY Coos County\n FEMA-CID 41011C\n \n \n None\n Acknowledgment of FEMA would be appreciated in products derived from these data. This digital data is produced for the purposes of updating/creating a DFIRM database.\n \n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n \n Oregon Department of Geology and Mineral Industries (DOGAMI)\n ArcGIS Desktop 9.3.1\n \n\t\n When FEMA revises an FIS, adjacent studies are checked to ensure agreement between flood elevations at the boundaries. Likewise flood elevations at the confluence of streams studied independently are checked to ensure agreement at the confluence. The FIRM and the FIS are developed together and care is taken to ensure that the elevations and other features shown on the flood profiles in the FIS agree with the information shown on the FIRM. However, the elevations as shown on the FIRM are rounded whole-foot elevations. They must be shown so that a profile recreated from the elevations on the FIRM will match the FIS profiles within one half of one foot.\n\t\tData contained in the Floodplain Mapping and Redelineation files reflect the content of the source materials. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. With new mapping, FEMA plans to maintain full detail in the spatial data it produces. However, older information is often transferred from existing maps where some generalization has taken place. Flood risk data are developed for communities participating in the NFIP for use in insurance rating and for floodplain management. Flood hazard areas are determined using statistical analyses of records of river flow, storm tides, and rainfall; information obtained through consultation with the communities; floodplain topographic surveys; and hydrological and hydraulic analysis. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied.\n\t\t\n\t\t\t\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tFEMA\n\t\t\t\t\t\t20090925\n\t\t\t\t\t\tEffective DFIRM for Coos County Unincorporated and Incorporated Areas\n\t\t\t\t\t\n\t\t\t\t\n\t\t\t\tonline\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t20090925\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\tpublication date\n\t\t\t\t\n\t\t\t\tFIRM1\n\t\t\t\tThis DFIRM provided a baseline for which redelination would be performed in the current project. Cross-section WSELs and static BFEs were used to redelineate AE zones. Floodway boundaries (where not impinged upon by AE zone redelination) and profile baselines were incorporated as-is from this DFIRM. Where improved topographic data was not available flood zones were incorporated as-is from this DFIRM (this occurs in only sparse areas in the eastern-most portion of the county). The stream reaches to be redelineated using approximate methods were identified using the geographic extent of A zones in this DFIRM as a guide. In A zones not hydrologically connected to riverine systems, representative elevations were extracted from improved topographic data to aid in redelineation (this occurs in dune-dominated coastal areas north of Coos Bay).\n\t\t\t\n\t\t\t\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tOregon Department of Geology and Mineral Industries (DOGAMI)\n\t\t\t\t\t\t00000000\n\t\t\t\t\t\tDraft FIS Report for Coos County Unincorporated and Incorporated Areas\n\t\t\t\t\t\n\t\t\t\t\n\t\t\t\tNot Yet Available\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t20100407\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\tMIP Submission Date\n\t\t\t\t\n\t\t\t\tFIS1\n\t\t\t\tWorking FIS Report document outlining methods for redelineation.\n\t\t\t\n\t\t\t\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tOregon Department of Geology and Mineral Industries (DOGAMI)\n\t\t\t\t\t\tOregon Lidar Consortium (OLC)\n\t\t\t\t\t\tWatershed Sciences, Inc.\n\t\t\t\t\t\t20090924\n\t\t\t\t\t\tOregon Lidar Consortium South Coast Project\n\t\t\t\t\t\n\t\t\t\t\n\t\t\t\tDVD-ROM\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t20090924\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\tMIP Submission Date\n\t\t\t\t\n\t\t\t\tBASE1\n\t\t\t\t1-meter resolution bare earth lidar grids acquired in the summer of 2008. See topographic data development work item for more information. This dataset is the elevation source for redelineation. It was also used for heads-up digitization of streams and waterbodies.\n\t\t\t\n\t\t\t\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\tFEMA\n\t\t\t\t\t\t20090925\n\t\t\t\t\t\tEffective FIS Report for Coos County Unincorporated and Incorporated Areas\n\t\t\t\t\t\n\t\t\t\t\n\t\t\t\tonline\n\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t20090925\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\tpublication date\n\t\t\t\t\n\t\t\t\tFIS2\n\t\t\t\tThis FIS Report provided flood profiles from which WSELs were interpretted for redelination of 0.2% annual chance flood zones. It also provided Manning's N values used in initial AE zone delineation. These Manning's N values were used to derive a countywide characteristic Manning's N value for A zone redelineation.\n\t\t\t\n\t\t\t\n Floodplain Mapping and Redelineation data are compiled in conjunction with the hardcopy FIRM and the final FIS report. The specifics of the hydrologic and hydraulic analyses performed are detailed in the FIS report. The results of these studies are submitted in digital format to FEMA. These data and unrevised data from effective FIRMs are compiled onto the base map used for DFIRM publication and checked for accuracy and compliance with FEMA standards.\n FIS1\n\t\t\t\t20100407\n\t\t\t\t00\n\t\t\t\t\n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n\t\t\t\t\n\t\t\t\n\t\t\t\n AE zone redelineation: Redelineation was accomplished by extracting contour elevations (ArcGIS 9.3.1 Desktop --> ArcToolbox --> Spatial Analyst Tools --> Surface --> Contour List) as informed by FIRM1 cross-sections WSELs. For cartographic considerations, contours were extracted from a smoothed version of the BASE1 (ArcGIS 9.3.1 Desktop --> ArcToolbox --> Spatial Analyst Tools --> Neighborhood --> Focal Statistics; Neighborhood = rectangle; 20 x 20 Cell; Statistics type = Mean). For redelineation between cross-sections, an inferred transition was completed by hand using the ArcGIS Desktop 9.3.1 Editor tools. A slopeshade of BASE1 was used to infer the most appropriate transition.\n FIRM1\n BASE1\n\t\t\t\t20100407\n\t\t\t\t00\n\t\t\t\t\n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n\t\t\t\t\n\t\t\t\n\t\t\t\n A zone redelineation: Redelineated was accomplished using the HECGeoRAS add-on to ArcGIS Desktop 9.3.1, developed by the U.S. Army Corps of Engineers in conjunction with HEC-RAS. Using the HECGeoRAS add-on, hydraulic geometries for stream centerlines, flowpaths, cross-sections, bank lines, and land use areas were digitized by hand with BASE1 as a backdrop. A countywide Manning's N value of 0.04 was applied to the land use areas. Geometries were then exported to HEC-RAS 4.0 and cross-sections were filtered to 250 points. From Oregon's USGS StreamStats website (http://water.usgs.gov/osw/streamstats/oregon.html), PK100 discharges were noted at every confluence. The steady flow table was populated with these discharges. Normal depth was determined by calculating the slope between the farthest downstream cross-section and the downstream terminus of the stream centerline. The steady flow model was run in HEC-RAS 4.0 and then exported to ArcGIS Desktop 9.3.1/HECGeoRAS where depth grids, water surface grids, and flood zone polygons were produced. For cartographic considerations the output flood polygons were aggregated and smoothed ([ArcGIS 9.3.1 Desktop --> ArcToolbox --> Data Management Tools --> Generalization --> Aggregate Polygon; Aggregation distance = 7 meters; Minumum area = 50 square meters; Minimum hole size = 150 square meters], [ArcGIS 9.3.1 Desktop --> ArcToolbox --> Data Management Tools --> Generalization --> Smooth Polygon; Smoothing algorithm = PAEK; Smoothing tolerance = 20 meters]). Wherever possible (dependent on lidar grid size and hydrologic connectedness), streams were modeled together in networks.\n FIRM1\n BASE1\n\t\t\t\t20100407\n\t\t\t\t00\n\t\t\t\t\n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n\t\t\t\t\n\t\t\t\n\t\t\t\n 0.2% Annual Chance Flood zone redelineation: Redelineation was accomplished by inferring 0.2% annual chance WSELs from flood profiles in FIS2 at each lettered cross-section. Using these WSELs, the same redelineation procedure for redelineation for AE zones was carried out.\n FIS2\n BASE1\n\t\t\t\t20100407\n\t\t\t\t00\n\t\t\t\t\n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n\t\t\t\t\n\t\t\t\n\t\t\t\n V zone redelineation: See coastal mapping work item.\n BASE1\n\t\t\t\t20100407\n\t\t\t\t00\n\t\t\t\t\n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n\t\t\t\t\n\t\t\t\n\t\t\t\n Stream redelineation: Using BASE1 as a backdrop, stream centerlines were heads-up digitized for the entire county at an average scale of 1:3,500. The National Hydrologic Dataset was used for steam length reference and to populate stream names. Where it was difficult to make out the steam centerline from BASE1, 2005 statewide orthophotos for the State of Oregon were sometimes of use.\n BASE1\n\t\t\t\t20100407\n\t\t\t\t00\n\t\t\t\t\n \n \n Jed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n \n Geospatial Data Coordinator\n \n mailing and physical\n
800 NE Oregon Street
\n
Suite 965
\n Portland\n Oregon\n 97232\n USA\n \n (971) 673-1546\n (971) 673-1562\n jed.roberts@dogami.state.or.us\n 7:30AM to 4:30PM PST\n \n\t\t\t\t\n\t\t\t\n\t\t\n \n\t\n\t\n\t\n\t\t\n \n \n Universal Transverse Mercator\n \n 10\n \n 0.999600\n -123.000000\n 0.000000\n 500000.000000\n 0.000000\n \n \n \n \n row and column\n \n 1.000000\n 1.000000\n \n meters\n \n \n\t\t\t\n\t\t\t\tNorth American Datum of 1983\n\t\t\t\tGeodetic Reference System 80\n\t\t\t\t6378137.000000\n\t\t\t\t298.257222\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\tNorth American Vertical Datum of 1988\n\t\t\t\t0.000001\n\t\t\t\tfeet\n\t\t\t\tAttribute values\n\t\t\t\n\t\t\n\t\n\t\n \n \n S_Fld_Haz_Ar\n Location and attributes for flood insurance risk zones on the DFIRM\n FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Databases (available at http://www.fema.gov/plan/prevent/fhm/dl_cgs.shtm)\n \n \n \n \n S_Wtr_Ln\n Location and attributes for hydrography features shown on DFIRM\n FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Databases (available at http://www.fema.gov/plan/prevent/fhm/dl_cgs.shtm)\n \n \n \n \n S_XS\n Location and attributes for cross-section lines in the area covered by the DFIRM\n FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix L: Guidance for Preparing Draft Digital Data and DFIRM Databases (available at http://www.fema.gov/plan/prevent/fhm/dl_cgs.shtm)\n \n \n \n The Floodplain Mapping and Redelineation datasets contain both spatial and attribute information. These data together represent the current flood risk for the subject area as identified by FEMA. The attribute tables may include SFHA locations, flood zone designations, BFEs, political entities, cross-section locations, FIRM panel information, and other data related to the NFIP.\n Appendix L of FEMA Guidelines and Specifications for FEMA Flood Hazard Mapping Partners contains a detailed description of each attribute code and a reference to other relevant information.\n \n\t\n\t\n\t\t\n\t\t\t\n\t\t\t\t\n\t\t\t\t\tOregon Department of Geology and Mineral Industries (DOGAMI)\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\tmailing address\n\t\t\t\t\t
800 NE Oregon Street
\n\t\t\t\t\t
Suite 965
\n\t\t\t\t\tPortland\n\t\t\t\t\tOregon\n\t\t\t\t\t97232\n\t\t\t\t\tUSA\n\t\t\t\t\n\t\t\t\t(971) 673-1555\n (971) 673-1562\n info@oregongeology.org\n \n\t\t\n\t\tNo warranty expressed or implied is made by DOGAMI regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty.\n\t\t\n\t\t\t\n \n ESRI Shapefile\n \n \n \n \n \n http://www.oregongeology.org\n \n \n \n \n \n Contact Distributor\n\t\t\n\t\n\t\n\t\t20100407\n\t\t\n\t\t\t\n\t\t\t\t\n\t\t\t\t\tJed Roberts\n Oregon Department of Geology and Mineral Industries (DOGAMI)\n\t\t\t\t\n\t\t\t\tGeospatial Data Coordinator\n\t\t\t\t\n\t\t\t\t\tmailing and physical\n\t\t\t\t\t
800 NE Oregon Street
\n\t\t\t\t\t
Suite 965
\n\t\t\t\t\tPortland\n\t\t\t\t\tOregon\n\t\t\t\t\t97232\n\t\t\t\t\tUSA\n\t\t\t\t\n\t\t\t\t(971) 673-1546\n\t\t\t\t(971) 673-1562\n\t\t\t\tjed.roberts@dogami.state.or.us\n\t\t\t\t7:30AM to 4:30PM PST\n\t\t\t\n\t\t\n\t\tFGDC Content Standard for Digital Geospatial Metadata\n\t\tContent Standard for Digital Geospatial Metadata (CSDGM), Vers. 2 (FGDC-STD-001-1998)\n\t\t\n\t\t\thttp://hazards.fema.gov\n\t\t\thttp://www.epsg.org\n\t\t\tFEMA NFIP Metadata Content and Format Standard\n\t\t\n\t\n","source_transform":null,"status":"error"}