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ROCK RIVER FLOOD
INUNDATION MAPPING PROJECT
November 5, 2015
Roxanne GrayMitigation Section Supervisor
Wisconsin Emergency Management
Chris OldsFloodplain Engineer
Wisconsin Department of Natural Resources
What is it?
• Development of map libraries that contains a series of sequential maps that help communicate where flooding may occur over a range of river levels
• Connected to real-time and forecasted river levels at USGS streamgages
• Utilized for preparedness, timely response, recovery, mitigation and planning, environmental and ecological assessments
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Background
• WDNR, WEM, and USGS met December 2012 to discuss a pilot flood inundation mapping project in the state
• Due to the flood risk, LIDAR, flood modeling, and mitigation activities selected the Rock River
• Reached out to Dodge, Jefferson and Rock Counties in January 2013 to determine local interest
• Stakeholders meeting held in April 2013 in Jefferson
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Invited Stakeholders
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• WDNR
• WEM
• DOT
• DOA
• WEDC
• Officials from Dodge, Jefferson, and Rock Counties
• USACE
• NWS
• USGS
• FEMA
• Association of StateFloodplain Managers
FRMP Proposal
• USACE call for proposals February 13, 2013
• WEM, WDNR, USGS, USACE and NWS
• Submitted April 3, 2013
• Shared proposal at the stakeholders meeting on April 23rd
• Some modifications to proposal
• Notified April 21, 2014 proposal accepted
• Included 5 reaches for flood inundation libraries on the Rock River covering 38 miles
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Outcomes
• User-friendly visual tool to understand potential impacts of flooding enabling local officials and property owners to make informed decisions to:• Mitigate flood risk
• Respond to flooding
• Promote preparedness
• Improve protective measures and evacuation options prior to floods
• Identify cost-effective mitigation measures, thus lowering future response, repair and recovery costs
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Inundation Locations
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Base Data
• Rock River hydraulic model created for FEMA’s RiskMap project in the Rock River watershed
- survey completed in spring of 2010
- model effective in Dane on 9/17/14, Dodge 5/19/14, Jefferson 2/4/15, Rock 9/16/15
• Terrain data from each county
-Dane 2009, Dodge 2006, Jefferson 2012, Rock 2011
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Calibration of Model
• Jefferson, Fort Atkinson and Lake Koshkonong gages will use the new model for basis of an updated rating curve
• Afton and Watertown locations in the model had to be adjusted so the model matched existing rating curves within 0.5’
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Web Location
Search “nws inundation”
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Web Location
Within the NWS site
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Web location
http://water.weather.gov/ahps/inundation.php
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Individual Site Example
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Individual Site Example
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Individual Site Example
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Individual Site Example
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Basemap choices
Individual Site Example
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Basemap choices
Individual Site Example
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Depth of flooding
Individual Site Example
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Depth of flooding
Individual Site Example
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Individual Site Example
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Depth of flooding
Individual Site Example
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Map overlays - NFHL
Individual Site Example
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Map overlays - transparency
Individual Site Example
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Other flood data
Individual Site Example
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Other flood data
Individual Site Example
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Download data
Individual Site Example
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Download data
Links
http://water.weather.gov/ahps2/inundation/index.php?gage=aftw3
http://water.weather.gov/ahps2/inundation/index.php?gage=fatw3
http://water.weather.gov/ahps2/inundation/index.php?gage=jffw3
http://water.weather.gov/ahps2/inundation/index.php?gage=nvlw3
http://water.weather.gov/ahps2/inundation/index.php?gage=watw3
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Contact Info
Roxanne GrayWisconsin Emergency Management
Mitigation [email protected]
608-242-3211
Chris OldsWisconsin Department of Natural Resources
Bureau of Watershed Management/Dam Safety & Floodplain Section
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