Oregon Department of Geology and Mineral Industries 2018 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 Oregon Department of Geology and Mineral Industries 2018 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 total replacement value of buildings, contents, and inventory and the cost to replace or repair buildings, contents, and inventory due to a 100-year, standard and long duration (greater than 3 days of inundation) flood. Additional attributes include the debris produced during a 100-year flood and the average depth of flooding for flooded structures. All values are summed by drainage district. DOGAMI staff produced building, content, and inventory damage estimates following 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 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 district 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 replacement cost of a building is based on standard replacement costs from RSMeans and is dependent on the Occupancy Class assignment. Occupancy Class assignments were modified from the Bauer and others (2018) dataset which relied on data sources including the county assessor property class information, Metro RLIS land use and public buildings, and Oregon employment data. Unless more accurate, site-specific information was available, content and inventory replacement costs were assigned following the Hazus-MH methodology based on occupancy class and building area, using the ratios specified by FEMA (2011, Table 14.6). Loss estimate ratios are based on empirical data and expert opinions built into the Hazus-MH model and highly dependent on the Occupancy Class assigned to the building, the depth-in-structure, and the first floor height assigned to the building. Although these loss ratios and damage estimates should not be used to predict loss for an individual building, they are informed by empirical data and appropriate for predicting damage to groups of buildings (e.g. when summarized at a district level). Damage results were rounded to the nearest thousand dollar. (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) Database QA-QC was carried out, attributes fell within parameters. All buildings greater than 400 square feet in footprint size, and within drainage district boundaries (SIDIC, PEN1, PEN2, MCDD-W, MCDD-E, SDIC) were analyzed and the results were summed at a district level. At the request of MCDD staff, three buildings located just outside of the current MCDD-E boundary but within the 100-year and 500-year flood inundation area were added to MCDD-E for the purposes of this study. A limited number of planned, but unconstructed buildings were also included in the assessment. 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 flood depths are based on 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. We must caution that this accuracy is established on open, hard-packed surfaces, and that depth-in-structure may be at significant variance with the flood depth grid information. As part of the standard lidar point cloud data processing, buildings are excised by the lidar vendor for bare earth elevation derivation, but the resultant surface for the excised building is not necessarily flat, thus creating significant variability across the building footprint. Further, a structure may be elevated above the bare earth, and not exposed to flooding. While we adjust for the elevation, often this was done based on generic occupancy class, e.g., RES2 (Manufactured Housing) buildings in a location were given the same First Floor Height, which is used to calculate depth-in-structure. Manual adjustments of First Floor Height were done where warranted, based on street level imagery and field assessments. DOGAMI 2018 vector digital data Oregon Department of Geology and Mineral Industries Open-File Report O-18-02 Portland 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 produced building, content, and inventory damage estimates following FEMA's Hazus-MH methodology given a 100-year flood water surface elevation and long-duration depth-damage functions. If long-duration depth-damage functions were not available for a given building occupancy class, default depth-damage functions were used. (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)) Num_Bldgs Total number of buildings Value_Bldgs Building replacement cost, units in US dollars rounded to nearest thousand Value_Cont Content replacement cost, units in US dollars rounded to nearest thousand Value_Inv Inventory replacement cost, units in US dollars rounded to nearest thousand Exp_100 Number of buildings exposed to 100-year flood BldgLoss_St Building damage replacement cost, standard depth-damage functions, units in US dollars rounded to nearest thousand BldgLoss_LD Building damage replacement cost, long-duration depth-damage functions, units in US dollars rounded to nearest thousand BldgLR_St Building damage loss ratio, standard depth-damage functions, units as a percent BldgLR_LD Building damage loss ratio, long-duration depth-damage functions, units as a percent ContLoss_St Content damage replacement cost, standard depth-damage functions, units in US dollars rounded to nearest thousand ContLoss_LD Content damage replacement cost, long-duration depth-damage functions, units in US dollars rounded to nearest thousand InvLoss_St Inventory damage replacement cost, standard depth-damage functions, units in US dollars rounded to nearest thousand InvLoss_LD Inventory damage replacement cost, long-duration depth-damage functions, units in US dollars rounded to nearest thousand Debris Debris removed from damaged buildings, units in tons Ave_Depth Average depth of flooding for flooded structures, units in feet 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

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 Although these data have been processed successfully on a computer system at the Oregon Department of Geology and Mineral Industries, no 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. 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 Oregon Department of Geology and Mineral Industries Metadata Standard 1.2 None None None None None