2010 Metro Mitigation Plan

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(This page left blank intentionally.) Metropolitan Nashville - Davidson County Hazard Identification Multi-Hazard Mitigation Plan Page 4-48 April 2010
LANDSLIDES The term landslide includes a wide range of ground movement, such as rock falls, deep failure of slopes, and shallow debris flows. Although gravity acting on an over-steepened slope is the primary reason for a landslide, there are other contributing factors: Erosion by rivers, glaciers, or ocean waves create oversteepened slopes; Rock and soil slopes are weakened through saturation by snowmelt or heavy rains; Earthquakes create stresses that make weak slopes fail; Earthquakes of magnitude 4.0 and greater have been known to trigger landslides; Volcanic eruptions produce loose ash deposits, heavy rain, and debris flows; and Excess weight from accumulation of rain or snow, stockpiling of rock or ore from waste piles or from man-made structures may induce weak slopes to fail. Landslides constitute a major geologic hazard because they are widespread, occurring in all 50 states, and cause $1 to 2 billion in damages and more than 25 fatalities, on average, each year. Landslides pose serious threats to highways and to structures that support fisheries, tourism, timber harvesting, mining, and energy production, as well as general transportation. Landslides commonly happen concurrently with other major natural disasters such as earthquakes and floods, which exacerbate relief and reconstruction efforts. Expanded development and other land uses have increased the incidence of landslide disasters. Steep slopes, present throughout the Metro area, specifically in south-central Davidson and north-central Williamson Counties, have the potential to be unstable. Landslides have occurred in this area due to construction-altered colluvium soils on steep slopes adjacent to the Highland Rim escarpment. Colluvium soils are derived from the weathering and erosion of the siliceous Fort Payne Formation, and are composed chiefly of silt- to clay-sized fragments of silica with some fragments ranging up to boulder size. Developments on steeper slopes in recent years have increased the number of landslides and the potential for landsliding in areas around Nashville, especially in the Bellevue area of southwestern Davidson County. Most recent landslide incidents have occurred on Dellrose soils at the base of the Fort Payne-Chattanooga slopes. Figure 4-10 presents evidence of a landslide that occurred at an apartment complex along Edmondson Pike. The slides average about 200 feet in width, 150 feet in length, and have steep surfaces on the undisturbed ground at the upper edge of the landslide ranging from about 3 feet to 24 feet. These slides are significant because they occurred in residential subdivisions with resulting financial loss to many property owners. Damage ranged from minor cracks in retaining walls and foundations to major structural failure of residences. Roadways and driveways were crumpled, dislocated, or cracked. Metropolitan Nashville - Davidson County Hazard Identification Multi-Hazard Mitigation Plan Page 4-49 April 2010
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Metropolitan Nashville-Davidson Cou
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4.2 Vulnerability Assessment ......
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LIST OF FIGURES Figure 2-1 Metropol
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USDA USGA WCT WNV United States Dep
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Metropolitan Nashville-Davidson Cou
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equired revision every 5 years. The
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Figure 2-1. Metropolitan Nashville-
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Subarea 1 - Joelton Joelton is loca
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Nashville, coupled with the concent
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Interstate 24 and Briley Parkway; t
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Figure 3-1. Similarity Between DMA
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Step 2: Involve the Public In addit
Page 28 and 29: Step 5: Assess the Problem Once the
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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 44 and 45: Likelihood of Future Occurrences Th
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
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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
Page 94 and 95: Figure 4-18. Tennessee Forestry Dis
Page 96 and 97: how hot it feels to an individual w
Page 100 and 101: Figure 4-21. Average Number of Thun
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Page 104 and 105: Past Occurrences Several severe tor
Page 106 and 107: Past Occurrences There have been 16
Page 108 and 109: Critical Facilities Of significant
Page 110 and 111: Scientific Name Common Name Federal
Page 112 and 113: Historic and Natural Resources are
Page 114 and 115: West Nile Virus is spread through m
Page 116 and 117: DAM & LEVEE FAILURES Risk - Moderat
Page 118 and 119: WNQM AM 1300; WUPX UPN 30; WVOL AM
Page 120 and 121: Table 4-31. Earthquake Hazard Damag
Page 124 and 125: 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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