Idaho Risk MAP Activities Ryan McDaniel, CFM Cooperating Technical Partners Coordinator Idaho Department of Water Resources

What is RiskMAP? Idaho Risk MAP Sequence & LiDAR Idaho Risk MAP Discovery Overview Idaho Risk MAP Product Lines Opportunities in Risk MAP

What is Risk MAP? Beginning in Fiscal Year (FY) 2009, FEMA initiated the Risk MAP program. FEMA’s vision for the Risk MAP program is “to deliver quality data that increases public awareness and leads to mitigation actions that reduce risk to life and property.” To achieve this vision, FEMA will transform its traditional flood identification and mapping efforts into a more integrated process of accurately identifying, assessing, communicating, planning and mitigating flood risks, according to Procedure Memorandum No. 59 (July 23, 2010).

What is Risk MAP? Geographic Information System National Flood Insurance Program Floodplain Management Hazard Mitigation Knowledge Management Interface Idaho Regional Flood Hazard Data

What is Risk MAP?

Risk MAP Timeline

Idaho Risk MAP Business Plan Idaho Risk MAP Program Statement Executive Summary Purpose Intent Role Background Statement of Work Vision Goals Objectives: Summary Narrative 1 Aerial Topographic Mapping 2 Floodplain Technical Mapping Activity 3 Community Risk Assessment and GIS Support 4 Outreach 5 Project Management and Staffing Strategy: Matrix Resource Needs Future Activities Reference Materials Program Diagrams Idaho Flood Risk Portfolio: Priority Sequence

Idaho Flood Risk Portfolio

Idaho Risk MAP LiDAR Acquisition

Idaho Risk MAP Prioritization

Idaho Risk MAP Discovery Diverting high-water down canals Significant flooding in the past in Payette, Emmett and Horseshoe bend 3 Wastewater facilities abut Payette River Diversion Dam at Hydro-electric plan Levees, Levees on private property Black Canyon Reservoir is filling with sediment Use LiDAR to re-delineate A zones Detailed AE zones in Municipal Areas of Impact Payette

Idaho Risk MAP Discovery Detailed Studies on 10-Mile, 9- Mile, 5-Mile and Indian Creeks Utilize existing USACE H&H Model for the Boise River and Continue from Ada Co to Snake ACCEM already has Hazus II complete, work on Canyon Co. Boise Foothills Tributaries need to be re-delineated using LiDAR Canals represent a significant flood risk to much of the watershed, as do dam breach scenarios Lower Boise

Idaho Risk MAP Discovery Significant inaccuracies in existing DFIRM due to original 10m DEM delineation, recent Digital Conversion perpetuated this error Significant backwater flooding in several cities caused by undersized culverts, roadway and railway embankments Levees, Levees on private property, PAL’s Split-flow modeling concerns on the Big Wood River Use LiDAR to re-delineate A zones Numerous Claims outside SFHA Identified extensive coverage of D zones Big Wood

Idaho Risk MAP Discovery Upper part of the watershed has high risk during tourism season Freemont County requested A zones at Big Springs Thirsty Creek. Redelineate Duck Creek using LiDAR, but account for undersized culverts at roadways Island Park and Ashton Dam Failure Warning systems need be considered for PDM Grants Ashton Dam is currently under reconstruction due to seepage issues Upper Henry’s

Idaho Risk MAP Discovery Major risk associated with ice jams at several flooding areas Redelineate A zones using LiDAR at the St. Anthony Coffer Dam, it pushes water from Henry’s over an irrigation canal and causes major flooding Detailed Study at Salem Parker Highway to guide development Yellowstone and Enterprise canals represent substantial risk for breach Numerous undersized culverts Lower Henry’s

Idaho Risk MAP Discovery Primary flood risk is rain on snow on frozen ground events; secondary flood risks are ice jams where narrow canyons meet wide, flat floodplains; tertiary risk where ice jams divert floodwaters into canals North Fork/South Fork Teton River, Teton Creek and Trail Creek need AE zones Sugar City has series of bridges funnel water/ice toward city Spring and South Leigh Creek under development pressure Teton

Idaho Risk MAP Product Lines Changes Since Last FIRM Data Areas of Mitigation Interest Flood Risk Report Flood Risk Map Flood Risk Geodatabase Flood Risk Assessment Data Flood Depth & Analysis Grids

State prioritization of watersheds Develop consistent standards for flood hazard data Communicate a common flood risk message *** Done in order to provide local governments with the necessary information to define their own future: one with reduced flood risk. *** Opportunities in Risk MAP

Idaho Risk MAP Activities Ryan McDaniel, CFM Cooperating Technical Partners Coordinator Idaho Department of Water Resources Thank You!