Displaced population, impact on employment, and exposure of key infrastructure, hazardous materials, and community assets due to a levee breach during a 100-year or 500-year flood, summarized by drainage district; Columbia corridor drainage districts in Columbia and Multnomah Counties, Oregon

Oregon Department of Geology and Mineral Industries 2018 Displaced population, impact on employment, and exposure of key infrastructure, hazardous materials, and community assets due to a levee breach during a 100-year or 500-year flood, summarized by drainage district; Columbia corridor drainage districts in Columbia and Multnomah Counties, Oregon SP-50 vector digital data Oregon Department of Geology and Mineral Industries Special Paper Portland, Oregon, USA Oregon Department of Geology and Mineral Industries http://www.oregongeology.org Oregon Department of Geology and Mineral Industries 2018 Flood risk assessment for the Columbia corridor drainage districts in Multnomah County, Oregon vector digital data Oregon Department of Geology and Mineral Industries Special Paper SP-50 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries http://www.oregongeology.org/ This dataset was created by DOGAMI staff and includes polygons representing Sauvie Island Drainage Improvement Company (SIDIC), Peninsula Drainage District 1 (PEN 1), Peninsula Drainage District 2 (PEN 2), Multnomah County Drainage District 1 (MCDD), and Sandy Drainage Improvement Company (SDIC). Each polygon has a list of associated attributes including the displaced population, number of businesses able to reopen and employees able to return to work immediately after flood waters recede, employee wages during the first year after flooding, and number of key infrastructure, hazardous materials, and community assets exposed to flooding during a levee breach and either 100-year or 500-year flood. Note that many of these attributes may be expressed either as a loss (e.g. initially displaced population) or as a positive a value (e.g. population able to return immediately to residences); these values sum to the total value provided (e.g. total population). All values are summed by drainage district. DOGAMI staff calculated post-flood annual wages based on business recovery times provided by FEMA's Hazus methodology given the 100-year flood depth grid. This dataset was created for a Hazus-based flood loss estimation for the Columbia Corridor Drainage Districts' flood risk assessment. 2018 Complete None planned -122.868300 -122.382854 45.742705 45.532909 ISO 19115 Topic Category geoscientificinformation society structure economy Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus flood levee depth drainage district building catastrophic flood Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus Multnomah Oregon Columbia Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus landscape building space Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus flood stage recent None REPORT DATA: This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication. See the accompanying text report for more details on the limitations of the methods and data used to prepare this publication. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@oregon.gov When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org Christina Appleby Oregon Department of Geology and Mineral Industries Drainage Districts.jpg This graphic shows the location of the Columbia Corridor Drainage Districts. S:\Technical_Review_Committee\Submitted for Technical Review\Appleby_Flood_Risk_Assessment_Columbia_Corridor_20180514\GIS and Spreadsheet\Thumbnail_images\Drainage Districts.jpg The Columbia Corridor Drainage Districts' Flood Risk Assessment was funded by the FEMA Region X RiskMap program. Unclassified The accuracy of this analysis is in large part dependent on the different sources of data. The datasets and sources are explained in the text of the accompanying report and include the US Census (2010), Oregon Employment Division (2016), Oregon Office of Emergency Management (2017), Oregon Office of State Fire Marshal (2017), Multnomah County Drainage District (MCDD) (personal communication, 2017), and Bauer and others (2018). Many of these datasets were modified by DOGAMI with guidance from MCDD staff. Asset exposure reflects the 100-year and 500-year areas of inundation derived from flood water surfaced elevations in the FEMA Flood Insurance Study (2009) and the lidar-based topography. Database QA-QC was carried out, attributes fell within expected ranges. This analysis was designed to reflect the population, businesses, and assets that exist or are planned as of 2017. Similar to the report accuracy the completeness of this analysis reflects the different sources of data previously stated Drainage district boundaries were provided by MCDD (personal communication, 2017) and modified by DOGAMI staff. At the request of MCDD staff, the MCDD-E boundary was modified to include three buildings located just outside of the current MCDD-E boundary but within the 100-year and 500-year flood inundation area for the purposes of this study. Building and asset flood exposure are based on flood depth grids derived from the Metro 2014 lidar and USACE Columbia River 2010 datasets with a vertical accuracy Root Mean Square Error of 0.03 m (0.11 ft) and 0.029 m (0.10 ft) respectively. First floor heights were manually assigned to buildings based on occupancy class, street level imagery, and field assessments. These estimated first floor heights may either over or underestimate the true building elevation, resulting in minor errors in the estimated total flood exposure. DOGAMI 2018 Earthquake regional impact analysis for Clackamas, Multnomah and Washington Counties, Oregon raster digital data Oregon Department of Geology and Mineral Industries Open-File Report Open-file Report O-18-02 Portland, Oregon DOGAMI http://www.oregongeology.org/pubs/ofr/p-O-18-02.htm 2018 DOGAMI staff created a user-defined facility dataset by modifying existing building information created by Bauer and others (2018). Staff then estimated the minimum and maximum recovery time for businesses following FEMA's Hazus-MH methodology given a 100-year and 500-year flood water surface elevation. This information was used to determine the number of businesses able to reopen and employees able to return to work immediately after flood waters recede and employee wages during the first year after flooding. DOGAMI staff determined the displaced population, number of key infrastructure, hazardous materials, and community assets exposed to flooding during a levee breach and either 100-year or 500-year using a GIS-based exposure analysis. All values are summed by drainage district. (Citation: Federal Emergency Management Agency, 2011, Hazus®-MH 2.1 Technical manual, Flood model: Washington, D.C., 569 p. https://www.fema.gov/media-library-data/20130726-1820-25045-8292/hzmh2_1_fl_tm.pdf) Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@oregon.gov When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org Vector GT-polygon composed of chains 6 NAD 1983 2011 Oregon Statewide Lambert Feet Intl 43.0 45.5 -120.5 41.75 1312335.958005249 0.0 coordinate pair 0.00032808398950131233 0.00032808398950131233 foot D NAD 1983 2011 GRS 1980 6378137.0 298.257222101 Building Flood Risk Analysis FEMA Multi-hazard Loss Estimation Methodology Federal Emergency Management Agency, 2011, Hazus®-MH 2.1 Technical manual, Flood model: Washington, D.C., 569 p. https://www.fema.gov/media-library-data/20130726-1820-25045-8292/hzmh2_1_fl_tm.pdf District Drainage district abbreviation (Sauvie Island Drainage Improvement Company (SIDIC), Peninsula Drainage District 1 (PEN 1), Peninsula Drainage District 2 (PEN 2), Multnomah County Drainage District 1 (MCDD), and Sandy Drainage Improvement Company (SDIC)) Pop Total population (Est. from US Census 2010) Pop_100Exp Population exposed to 100-yr flooding Pop_500Exp Population exposed to 500-yr flooding Pop_100Dmg Population damaged during 100-yr flooding Pop_500Dmg Population damaged during 500-yr flooding Biz Total number of businesses Biz_100yr Number of businesses able to reopen immediately after 100-year flood waters recede Biz_500yr Number of businesses able to reopen immediately after 500-year flood waters recede Emp Total number of employees Emp_100yr Number of employees able to return to work immediately after 100-year flood waters recede Emp_500yr Number of employees able to return to work immediately after 500-year flood waters recede Wage_annual Total annual employee wages, units in US dollars Wage_100yr Employee wages paid during first year after 100-year flood,minimum recovery time estimate, units in US dollars Wage_500yr Employee wages paid during first year after 500-year flood,minimum recovery time estimate, units in US dollars KeyInf Number of key infrastructure sites KeyInf_100Exp Number of key infrastructure sites exposed to 100-year flood KeyInf_500Exp Number of key infrastructure sites exposed to 500-year flood HazMat Total number of stored hazardous materials HazMat_100Exp Number of stored hazardous materials exposed to 100-year flood HazMat_500Exp Number of stored hazardous materials exposed to 500-year flood CmAsset Number of community asset point and polygon sites CmAsset_100Exp Number of community asset point and polygon sites exposed to 100-year flood CmAsset_500Exp Number of community asset point and polygon sites exposed to 500-year flood Attributes are similar to what is described in the Hazus Flood Technical Manual, with additional attributes made available from Bauer (2018). Bauer, J. M., 2018, ArcGIS Python script alternative to the Hazus-MH flood module for user-defined facilities: User guide: Oregon Department of Geology and Mineral Industries Open File Report O-18-04. http://www.oregongeology.org/pubs/ofr/p-O-18-04.htm Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965