1. Boise River, Idaho: Many Agencies Working Towards One Version of the Truth Ellen Berggren, USACE Walla Walla District Idaho Silver Jackets USACE Flood Risk Management & Silver Jackets Workshop August 23, 2012

2. Idaho Silver Jackets Core Team Agencies

4. Boise River General Investigation Idaho Risk Map Coordination Boise River Inundation Mapping Flood Response Training Flood Response After Action Review Tabletop Exercises Gaging Station Web Camera Whole Community Approach to Floodplain Mgmt Conference Joint USACE/FEMA Levee Briefings Boise River Flood Risk Community Meeting

5. Boise River General Investigation Idaho Risk Map Coordination Boise River Inundation Mapping

6. Boise River Inundation Mapping Study Agency Resources and Studies Leveraged Ada City-County Emergency Management (funding and technical review) Boise City (GIS, technical review) Garden City (technical review) Idaho Water Resource Board / Idaho Department of Water Resources (funding, technical review) USGS (river gage data) FEMA (digital flood insurance rate maps) USACE (funding, project mgt, modeling) National Weather Service (technical review; AHPS funding, development and implementation)

7. Flow Rate (cfs) Comments 4,90050-Percent Chance Flow 6,500Bankfull Flow 7,000Flood Stage at Glenwood Gage 7,20010-Percent Chance Flow 7,4402006 Flow Event, Used for Calibration 8,3101998 Flow Event, Used for Calibration 9,500New Flow 11,0002-Percent Chance Flow 13,000New Flow 15,000New Flow 16,6001-Percent Chance Flow 20,000New Flow 23,9000.5-Percent Chance Flow 29,000New Flow 34,8000.2-Percent Chance Flow HEC-RAS model Model originally prepared for Lower Boise Feasibility Study (General Investigation) 15.9 mile reach of river through Boise and Garden City Shaded depth maps for 15 flows

8. Interactive Flood Maps now Public National Weather Service AHPS - Advanced Hydrologic Prediction Service Web Page http://water.weather.gov/ahps2/inundation/inundation_google.php?g_datatype=depth&wfo=boi&gage=bigi1 http://water.weather.gov/ahps2/inundation/inundation_google.php?g_datatype=depth&wfo=boi&gage=bigi1

9. Outreach Meetings ­ Floodplain managers ­ Elected officials ­ Community Press releases Media interview Webpage Watershed Conference

10. Google Earth Fly-Through the 500 Year Flood Inundation

11. Questions Photo provided by Larry Ridenhour