US Army Corps of Engineers
Nashville District Website

Metro Flood Preparedness

FACT SHEET (As of May 2018)

Published May 1, 2018
Image of Davidson County to show the watersheds that could affect the county (USACE image)

Image of Davidson County to show the watersheds that could affect the county (USACE image)

 Metro Flood Preparedness 

 

US ARMY CORPS OF ENGINEERS BUILDING STRONG®

AUTHORIZATION: Section 22 of the 1974 Water Resources and Development Act (WRDA), Planning Assistance to States (PAS). 

TYPE OF PROJECT: Flood Risk Management

LOCATION: Nashville, TN

CONGRESSIONAL INTEREST:  Cooper (TN-05), Alexander (TN), Corker (TN)

NON-FEDERAL SPONSOR: City of Nashville, TN

BACKGROUND: As a result of the May 2010 flood, Metro Nashville is partnering with the Corps to develop flood inundation models and tools for all streams in Davidson County. The tools will enable the city to better predict what is likely to occur under different flooding scenarios and are being included in the Nashville SAFE tool. The inundation models will help Metro know what is flooded at various flood stages on the Cumberland and Harpeth Rivers and predict what could flood on the smaller streams based on forecasted rainfall. The USGS and NWS are also working on this project. The USGS has added new gages and is updating rating curves for the existing gages. NWS is working on additional forecasting for specific creeks and updating flood alerts levels and actions.

The models are being shared with FEMA for inclusion in the Flood Insurance Map update for Davidson County.

IMPORTANCE: Updating the FIS will help better define floodplains and reduce future flood risk. Providing better tools for decision makers and emergency responders will also reduce flood risk.

STATUS:

·  Phase 1 completed May 2011

·  Phase 2 completed December 2012

·  Phase 3 completed April 2013

·  Phase 4A completed in February 2015.

·  Phase 4B-4D completed in FY16.

·  Phase 5 – completed in FY18

·  Phase 6 -  started in FY18

 

BUDGET ($): Estimated project costs are shown below. 

 

Total Estimated Cost

$3,576,000

Federal Cost Estimate

1,788,000

Non-Federal Cost Estimate

1,788,000

 

 

Federal Funds Data

 

Allocation thru FY 2018

$1,588,000

Balance to Complete

200,000

President’s Budget for FY 2019

0

Note1 – PAS studies are cost shared 50/50

SCHEDULE:

FY2017 Completed Work:  Completed work on Phase 5. Scope included revisions and enhancements to the existing HEC-RTS (real-time simulation) models for Mill Creek and Richland Creek. Additional tasks included transferring technology to Metro and NWS, creation and training of new HEC-RTS models for Whites Creek and Browns Creek watersheds.

FY2018 Scheduled Work: Continue Phase 6 work. Scope for Phase 6 includes continued support to Metro Nashville on flood risk modeling and mapping, cross-agency coordination, training Metro staff and coordinating agencies, specialized H&H analysis of the Melrose Area in Brown’s Creek Watershed, updates to FIS modeling utilizing new 2016 LIDAR, extending HEC-RTS modeling to remaining major basins (Mansker Creek, Dry Creek, Stones River, Harpeth River, Sycamore Creek, Marrowbone Creek), and flood risk mapping tool (GIS web viewer).

Completion:  Work on Phase 6 is estimated to be completed in December 2019.

For more information regarding Nashville Flood Preparedness Studies, contact Ramune Morales, CELRN-PMP, phone: (615) 736-7853, email:  Ramune.Morales@usace.army.mil