Oregon Flood Hazard Data Standard v2.0 Summary of Proposed Amendment Collaborative Effort of: Jed Roberts (DOGAMI), Steve Lucker & Christine Shirley (DLCD) GIS Framework Forum ‘14 November 5, 2014 Photo: Andy Cripe, Corvallis Gazette-TimesWillamette Valley Flood 2012

What Are We Amending? GIS Framework Forum ‘14 November 5, 2014 Version 1.0 Endorsed in December 2006 Adopted FEMA digital flood insurance rate map (DFIRM) database as standard DLCD named as steward

GIS Framework Forum ‘14 November 5, 2014 Flood hazard data is more than FEMA flood insurance maps Need a standard for other flood mapping, high water marks, and flood warning gages Additional stewards of flood hazard data Why Are We Amending?

1.FEMA Flood Insurance Study Data (Old) Probabilistic flood inundation (100-, 500-year, etc.) For administering the National Flood Insurance Program 2.Other Flood Study Data (New) Probabilistic flood inundation Produced by other agencies or local government Not necessarily for flood insurance purposes 3.Observed Flood Inundation Data (New) Flood inundation from actual events Created from surveyed high water marks 4.Flood Warning Gages (New) Not captured in OWRD or USGS stream gage databases Elements of Amendment GIS Framework Forum ‘14 November 5, 2014

FEMA Flood Insurance Study Data 1.Flood Hazard Zones 100-year zone most common (where flood insurance is required) Sometimes 500-year zone is shown 2.Cross-Sections Locations where flood elevations are calculated Flood elevations are interpolated between cross- sections 3.Study Reach Section of river or stream that was studied GIS Framework Forum ‘14 November 5, 2014

100-Year Flood Hazard Zone Study Reach Cross-Section Elevations FEMA Flood Insurance Study Data GIS Framework Forum ‘14 November 5, 2014

Other Flood Study Data Same elements as FEMA Flood Insurance Studies Often more scenarios modeled (2-, 5-, 10-year, etc.) Performed for a variety of reasons Need more detailed data than FEMA studies Planning Restoration Mitigation structures (levees, dikes, etc.) Dam/reservoir management Performed by… U.S. Army Corps of Engineers U.S. Geological Survey DOGAMI Engineering firms (for cities/counties) GIS Framework Forum ‘14 November 5, 2014

Other Flood Study Data City of Portland – East Lents Floodplain Restoration Project GIS Framework Forum ‘14 November 5, 2014

Observed Flood Inundation Data 1.Flood Inundation Zones Extent of actual flooding from specific events (as opposed to probabilistic modeling) Existing data from 1996 Western Oregon floods, Vernonia (2007), Upper Sandy River (2011), Mid- Willamette Valley (2012) 2.High Water Marks Points where flood elevations are surveyed High water marks can be used to re-create flood inundation zone GIS Framework Forum ‘14 November 5, 2014

Observed Flood Inundation Data 2007 Vernonia flood inundation re-created from high water marks GIS Framework Forum ‘14 November 5, 2014

Flood Warning Gage Data Gages typically not included in… USGS – National Water Information System National Weather Service – Advanced Hydrologic Prediction Service OWRD – Near Real Time Hydrographics Data Gages are managed locally Temporary gages Staff gages City of Salem – High Water Watch GIS Framework Forum ‘14 November 5, 2014

Activity to Date May 5, 2014 – Distribution of amended standard to Hazard FIT Team for review August 5, 2014 – Distribution of amended standard to larger GIS community (45 day comment period) September 19, 2014 – Comment period closed October 30, 2014 – Addressed minor comments; re-submitted to Framework Coordinator GIS Framework Forum ‘14 November 5, 2014