2010 Metro Mitigation Plan

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Likelihood of Future Occurrences The Tennessee Safe Dams Program, operated by the TDEC, was created to protect the public from dam failures. TDEC inspects dams for safety and requires that dams meet stability and spillway standards in order to obtain and maintain an operating permit. Dams are inspected every 1, 2, or 3 years depending on the hazard potential category of the dam. Although the possibility of a dam failure is present, the probability of dam failure is low and not predictable. Metropolitan Nashville - Davidson County Hazard Identification Multi-Hazard Mitigation Plan Page 4-14 April 2010
FLOODING Floods are among the most frequent and costly natural disasters in terms of human hardship and economic loss. There are several different types of likely flood events in Tennessee including flash, riverine, and urban stormwater. Regardless of the type of flood, the cause can almost always be attributed to excessive rainfall, either in the flood area or upstream reach. The term "flash flood" describes localized floods of great volume and short duration. In contrast to riverine flooding, this type of flood usually results from a heavy rainfall on a relatively small drainage area. Precipitation of this sort usually occurs in the spring and summer. Riverine floods result from precipitation over large areas. This type of flood occurs in river systems whose tributaries may drain large geographic areas and include many independent river basins. The duration of riverine floods may vary from a few hours to many days. Factors that directly affect the amount of flood runoff include precipitation, intensity and distribution, the amount of soil moisture, seasonal variation in vegetation, snow depth, and water-resistance of the surface areas due to urbanization. Urban flood events result as land loses its ability to absorb rainfall as it is converted from fields or woodlands to roads, buildings, and parking lots. Urbanization increases runoff two to six times over what would occur on undeveloped terrain. During periods of urban flooding, streets can become swift moving rivers. All flood events may result in upstream flooding due to downstream conditions such as channel restriction and/or high flow in a downstream confluence stream. This type of flooding is known as backwater flooding. Major Sources of Flooding The Cumberland River is the largest stream in Davidson County and serves as the eventual receiving stream for all surface runoff in the County. Local, state, and federal agencies have defined watersheds in the county in a number of ways in prior reports. There are 26 watersheds in Davidson County as defined by the National Pollutant Discharge Elimination System (NPDES) permit (see Table 4-3). Twenty-five watersheds represent tributaries to the Cumberland River and the 26 th watershed represents the local inflow directly into the Cumberland River. As part of the National Flood Insurance Program (NFIP), floodplains and floodways on many local streams have been established and are regulated by the local floodplain management ordinance. The most recent Flood Insurance Study (FIS) for Metro Nashville was published by FEMA in 2001. The FIS includes Flood Insurance Rate Maps (FIRM) that presents the adopted floodplains, floodways, and flood profiles for streams in Davidson County. In preparation of the FIRMs, a total of 66 streams with combined lengths of approximately 250.95 miles were studied. Of this total, approximately 216.8 miles of streams were studied by detailed methods (see Table 4-3). Metropolitan Nashville - Davidson County Hazard Identification Multi-Hazard Mitigation Plan Page 4-15 April 2010
Page 1 and 2: Metropolitan Nashville-Davidson Cou
Page 3 and 4: 4.2 Vulnerability Assessment ......
Page 5 and 6: LIST OF FIGURES Figure 2-1 Metropol
Page 7 and 8: USDA USGA WCT WNV United States Dep
Page 9: Metropolitan Nashville-Davidson Cou
Page 12 and 13: equired revision every 5 years. The
Page 14 and 15: Figure 2-1. Metropolitan Nashville-
Page 16 and 17: Subarea 1 - Joelton Joelton is loca
Page 18 and 19: Nashville, coupled with the concent
Page 20 and 21: Interstate 24 and Briley Parkway; t
Page 22 and 23: (This page has been left blank inte
Page 24 and 25: Figure 3-1. Similarity Between DMA
Page 26 and 27: Step 2: Involve the Public In addit
Page 28 and 29: Step 5: Assess the Problem Once the
Page 34 and 35: Table 4-1. Federal Disaster Declara
Page 38 and 39: Figure 4-2. Dams and Levees within
Page 40 and 41: management. Total storage capacity
Page 42 and 43: infrequent occurrence. There has ne
Page 46 and 47: WATERSHED Table 4-3. Major Sources
Page 48 and 49: All streams within Metro Nashville,
Page 50 and 51: Nashville entered the flood insuran
Page 52 and 53: Damage Reach 1 Damage Reach 2 Damag
Page 54 and 55: Dry Creek Watershed The Dry Creek W
Page 56 and 57: performed. Primarily a rural portio
Page 62 and 63: Table 4-13. Pages Branch Damage Rea
Page 64 and 65: Table 4-14. Richland Creek Damage R
Page 70 and 71: 2.96. Damage Reach 12 is located on
Page 72 and 73: Cumberland River The Cumberland Riv
Page 74 and 75: The Southern Appalachian Seismic Zo
Page 76 and 77: 40g 30g 25g 20g 15g 10g 9g 8g 7g 6g
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Page 80 and 81: Figure 4-10. Evidence of Landslides
Page 82 and 83: Figure 4-11b. Slopes greater than 2
Page 84 and 85: Figure 4.13 Karst Hazard Map of Ten
Page 86 and 87: Human cases have been reported in a
Page 90 and 91: The PDSI indicates that for the per
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Figure 4-18. Tennessee Forestry Dis
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how hot it feels to an individual w
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(This page has been left blank inte
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Figure 4-21. Average Number of Thun
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Past Occurrences Several severe tor
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Past Occurrences There have been 16
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Critical Facilities Of significant
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Scientific Name Common Name Federal
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Historic and Natural Resources are
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West Nile Virus is spread through m
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DAM & LEVEE FAILURES Risk - Moderat
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WNQM AM 1300; WUPX UPN 30; WVOL AM
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Table 4-31. Earthquake Hazard Damag
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Figure 4-25 Tornado Siren Locations
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Table 4-33. Metropolitan Nashville-
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Evaluation of Existing Capabilities
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Harpeth River - Newsom Station Road
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4. MWS has prioritized Capital Impr
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GOAL #3: Objective 3.1: Objective 3
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measures. Team members were allowed
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2009 Update: Since the creation of
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Community Benefit: Potential fundin
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staff gages were installed in 2009
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Existing permit procedures should b
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Community Benefit: Life safety, Pot
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• Develop public-private partners
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2009 Update: MWS continues to send
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Metro officials should talk to thei
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COMPLETED ACTION 4: Double the numb
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• Construct tornado saferooms and
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With the adoption of this plan, the
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of the CPT. In addition, technical
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PROMULGATION STATMENT Date: TBD To:
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2. Multi-Hazard Mitigation Plan Sta
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METROPOLITAN GOVERNMENT OF NASHVILL
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Figure A-5 Mass email sent out from
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FLOODING-1 No. Location Historical
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FLOODING-3 No. Location Historical
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EARTHQUAKES-2 No. Date Richter Magn
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INFESTATIONS-1 West Nile Virus Loca
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WILDFIRES-1 No. Location Year Histo
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EXTREME COLD TEMPERATURES-2 No. Loc
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EXTREME HOT TEMPERATURES-1 No. Loca
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THUNDERSTORMS-1 No. Location Histor
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TORNADOES-2 No. Location Historical
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TORNADOES-4 No. Location Historical
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WINTER STORMS-1 No. Location Histor
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Metropolitan Nashville - Davidson C
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MCALPINE AV Cooper Creek DR 3 HART
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Trib. No. 3 GALLATIN PK OLD HICKORY
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HEATH RD BUFFALO RD HUNTWICK TRL HW
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NOLENSVILLE PK Sevenmile Creek DR 1
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Mill Creek Sorghum Branch ANTIOCH P
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HART LN BRICK CHURCH PK I- 65 §¨
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SUMMERLY DR W HILLWOOD DR DARDEN PL
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Stones River STEWARTS FERRY PK reek
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SAUNDERSVILLE RD SHUTE LN ANDREW JA
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Cumberland River RIVER RD RIVER ROA
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Cumberla nd River Browns Creek DR 1
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Metropolitan Nashville - Davidson C
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Metropolitan Nashville Department o
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Reconnaissance Report for Flood Dam
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Extreme Temperatures Chronology of
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2010 Metro Mitigation Plan

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