1Partnering to Enhance the Communication of Flood Risk

Track #2 – Efforts, Updates, and Experiences from the Field

Flood Inundation Maps Linked to

Real-time River Forecast and Observations

Victor HomNational Flood Inundation Mapping Services Leader

Hydrologic Services Division

National Weather Services Headquarters, Silver Spring, MD

Harrisburg, PA

Thursday August 23, 2012

2012 USACE Flood Risk Management and Silver Jackets Workshop

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Presentation Overview

Lesson Learned from the Idaho Silver Jackets Team

Comprehensive and Sustainable Solution to Idaho’s Flood Hazards with focus on the Boise River downstream of Lucky Peak Dam

Long term Flood Risk and Emergency Management Support Services

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The Idaho Silver Jackets Team Vision

The team’s vision is to serve as a catalyst in developing

comprehensive and sustainable solutions to

flood hazard issues, including mitigation

planning, flood hazard mapping, risk reduction

activities, and response and recovery planning.

http://www.nfrmp.us/state/factIdaho.cfm

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The Idaho Silver Jackets Team Goals

1. Ensure continuous collaboration for flood mitigation, response and recovery activities before, during and after flooding.

2. Provide a forum for examining all types of solutions for flood risk management, including both non-structural and structural solutions.

3. Learn about partner agency programs, identifying limitations and opportunities, and combine programs to create integrated, comprehensive and sustainable solutions.

4. Create a multi-agency technical resource for state and local agencies.5. Provide assistance in implementing high priority actions identified in the State's mitigation

plans.6. Improve flood risk communication and outreach, present a unified intergovernmental

message, and better educate and advise our mutual customers.7. Identify and facilitate improvements to existing programs, policies and processes.8. Identify other collaboration opportunities to combine resources and identify gaps in order

to minimize duplication of effort.9. Catalog and share information on past and future flood projects and initiatives.10. Prioritize current and future flood risk mitigation initiatives individually and collectively.11. Improve flood hazard mapping and risk analysis and linkages to advanced hydrologic

prediction models.

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A Recent Idaho Silver Jackets Team Accomplishment

In 2011, the Idaho Silver Jackets team collaborated with the Ada City-County Emergency Management (ACCEM) and City of Boise to develop inundation maps for

• enhancing flood risk communications,

• providing planning assistance for emergency response during flood events, and

• empowering decision makers with information for mitigating the flood impacts on the Boise River.

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Two Key Components to Flood Risk Mitigation for the City of Boise and Ada County

1. Inflow into Lucky Peak Dam and Reservoir,2. Contributing Outflows from Lucky Peak Reservoir + Irrigation Canals

Info about USACE Lucky Peak

• Approximately 2680 square miles drains into Lucky Peak Reservoir

• 10 Miles Upstream of the City of Boise ID• rolled earth-fill dam, 340 feet high and 1,700

feet long at the crest.• 600-foot-long concrete overflow• primary purpose: flood control, • secondary purpose: irrigation,• 4 hydropower turbines capable of operating at

5500 cfs to generate 87.5 MW.• When full the reservoir is 3,055 feet MSL. • The minimum pool is at 2,905 feet MSL • With a usable storage of 264,371 AF• Lake Freeboard (Surcharge) is at 3,060 feet

MSL

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USACE Lucky Peak Reservoir Operations

http://www.nwd-wc.usace.army.mil/ftppub/project_data/daily/snake_summary.txthttp://www.nwd-wc.usace.army.mil/report/luc.htm

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NWS NWRFC and USBR’s Arrowrock Dam

http://www.nwrfc.noaa.gov/rfc/ http://www.usbr.gov/projects/

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Boise River from Lucky Peak Dam to Eagle Island

http://water.weather.gov/ahps/inundation.php

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1. ..

Boise River at Glenwood Bridge

http://waterdata.usgs.gov/id/nwis/uv/?site_no=13206000http://water.weather.gov/ahps2/hydrograph.php?wfo=boi&gage=bigi1

A flow rate of 6,500 cubic feet per second (cfs) at Glenwood Bridge is

considered bank-full, while 7,000 cfs is flood stage.

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Partnered Flood Inundation Maps

1. ..

…

http://water.weather.gov/ahps/inundation.php

USACE completed a HEC-RAS model for 15 flows on the Boise River from Diversion Dam downstream to the head of

Eagle Island and produced flood extent and depth maps.

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…

April 2012 Test

In 2012, the Boise River peaked at 8100 cfs (highest flow in 14 years).

Our Meteorologist estimated that the Boise River inflows topped off at 26,000 cfs this past April.

Fortunately, there was reservoir capacity in the Boise River dams to absorb most of that.

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1. ..

Forecast Floodwaters for Julia Davis Park

~ 13,000 cfs

http://www.juliadavispark.org/images/stories/files/JDP_MapFinalDraft.pdf

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1. ..

Forecast Floodwaters to Impact Zoo Boise

~ 15,000 cfs

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1. ..

…

Forecast Floodwaters to Impact Bronco Stadium

~ 24,000 cfs

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…

Flood Warning / Flood Flow Categories

~11,000- 13,000 cfs

Ms. Tina Jensen, reporter of KIVI-TV ABC affiliated Local TV 6 in Boise Idaho, did a fantastic piece on this project and can be seen at:

http://www.kivitv.com/multimedia/videos/?bctid=1686378326001

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Special Thanks

Special Appreciation to:

Ellen Berggren, Project ManagerU.S. Army Corps of Engineers Walla Walla District - Boise Outreach Mary McGown, State Floodplain CoordinatorIdaho Department of Water Resources

Jay Breidenbach, Warning Coordination MeteorologistNWS Weather Forecast Office Boise Idaho Thanks to the Idaho Team and Other Contributors: Ada City-County Emergency Management, U.S. Bureau of Reclamation, U.S. Geological Survey, Idaho Department of Water Resources, Flood Control Districts 10 and 11, and local Cities

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National Flood Inundation Mapping Services

http://water.weather.gov/ahps/inundation.php

Path Forward to National Consistency

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1. ..

Google Public Alerts and Social Media

http://www.google.org/publicalertsCommon Alerting Protocol (CAP)Wireless Emergency Alerts (WEA)

Path Forward to International Messaging

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1. ..

…

NWS Weather Ready Nation … More than Floods

http://www.nws.noaa.gov/com/weatherreadynation/

• Severe Thunderstorm

• Flash Flood• Flood• Coastal Flood• Fire (Red Flag)• Hazardous

WeatherPath Forward to All Hazards Consistency

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Preparedness: Are you ready?

If not, what do you need to become ready?

Local needs should supersede that of outside interest.

Path Forward to National Preparedness