Name: BigFlood

Display Field: mmc_name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: These layers represent the inundation boundaries for hypothetical failures for each of TVA’s dams. The red layer represents the inundation for failure at the peak of the Probable Maximum Flood (PMF)MethodsInitial pool levels were taken as summer pool. Inflows for the river system were sourced from the most current TVA PMF calculations. Hydraulic geometry was created based on existing models and GIS data. Dam geometry was sourced from TVA drawings. Custom reservoir operation rules were created in HEC-RAS. Failure geometries were created based on FERC guidance. HEC-RAS runs were performed for every scenario and RAS-Mapper was used to create inundation boundaries and travel times. The full calculation can be found in TVA document # XXXXXX.Zones (Only Zone A included in this layer)A - probable areas inundated from dam failure during Probable Maximum Flood (PMF). Note: The flooded areas shown on this map were developed for the use in evacuation planning for the unlikely event of a PMF flood and/or a dam failure. They do not reflect upon the integrity of these dams.

Copyright Text: Curt Jawdy of TVA and Shaun Carney of Riverside Technology.

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Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -86.837652728824
YMin: 35.047443077721
XMax: -86.3186404586072
YMax: 35.2811499306153
Spatial Reference: 4326 (4326)

Drawing Info:

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Templates:

Name: BigFlood
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Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 4/19/2018 4:44:28 PM

Schema Last Edit Date: 4/19/2018 4:44:28 PM

Data Last Edit Date: 4/19/2018 4:44:28 PM

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