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Boise River, Idaho: Many Agencies Working
Towards One Version of the Truth
Ellen Berggren, USACE Walla Walla DistrictIdaho Silver Jackets
USACE Flood Risk Management & Silver Jackets Workshop
August 23, 2012
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Idaho Silver Jackets
Core Team Agencies
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• 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
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• Boise River General Investigation• Idaho Risk Map Coordination• Boise River Inundation Mapping
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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)
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Flow Rate (cfs)
Comments
4,900 50-Percent Chance Flow
6,500 Bankfull Flow
7,000 Flood Stage at Glenwood Gage
7,200 10-Percent Chance Flow
7,440 2006 Flow Event, Used for Calibration
8,310 1998 Flow Event, Used for Calibration
9,500 New Flow
11,000 2-Percent Chance Flow
13,000 New Flow
15,000 New Flow
16,600 1-Percent Chance Flow
20,000 New Flow
23,900 0.5-Percent Chance Flow
29,000 New Flow
34,800 0.2-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
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Interactive Flood Maps now PublicNational 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
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Outreach• Meetings
Floodplain managers Elected officials Community
• Press releases• Media interview• Webpage• Watershed Conference
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Google Earth Fly-Through the 500 Year Flood Inundation
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Questions
Photo provided by Larry Ridenhour