Duval County - Northeast Florida Regional Council

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Volume VII-4 Northeast Florida Statewide Regional Evacuation Studies Program Storm Tide Post-Processing The Atlas was created using a Toolset wrapped into ESRI’s ArcGIS mapping application, ArcMap. The surge tool was developed for the Statewide Regional Evacuation Study Program by the Tampa Bay Regional Planning Council, who had used a similar tool for the previous Evacuation Study Update (2006). This tool enabled all regions within the state of Florida to process the SLOSH and elevation data with a consistent methodology. The tool basically performs the operation of translating the lower resolution SLOSH grid data into a smooth surface resembling actual storm tide and terrain; processing it with the high resolution elevation data derived from LIDAR. The image on the left represents how the data would look as it appears directly from SLOSH Model output. Figure 5: SLOSH Display Processing all the data in the raster realm, the tool is able to digest large amounts of data and output detailed representations of surge inundation. The program first interpolates the SLOSH height values for each category into a raster surface using spline interpolation. This type of interpolation is best for smooth surfaces, such as water and slow changing terrain. The result is a raster surface representing the surge height for a category that can be processed against the raster Digital Elevation Model from the LIDAR. The “dry” values (represented as 99.9 in the SLOSH Model) are replaced by an average of the inundated grids surrounding current processed grid. An algorithm performs this action utilizing the range of values in the current category of storm being processed. Using this methodology, once the elevation is subtracted from the projected storm tide, the storm tide limits are determined. The output of the tool is a merged polygon file holding all the maximum inundation zones for Category 1 through Category 5. The output, depicted in this Storm Tide Atlas is determined consistent with the coastal areas throughout the state. Figure 7 presents a compilation of the Storm Tide Atlas for the region. Figure 6: SLOSH Display Post-Processing Volume VII: Storm Tide Atlas Page 13
Volume VII-4 Northeast Florida Statewide Regional Evacuation Studies Program Figure 7: Storm Tide Limits for the Northeast Florida Region Page 14 Volume VII: Storm Tide Atlas
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Saye Dr Library Rd Tresca Rd Ormond
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Peregrine Ct Lily St Carnation St T
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Fish Rd W 420 81°50'0"W 21 81°49'
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Bronson Ln Indian Rd Tamworth Rd Gi
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I 95 Lorain St N Pearl St N Pearl S
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Sarah Brook Ct 30°25'0"N 81°35'0"
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Milton Dr 30°25'0"N 52 81°30'0"W
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460 81°25'0"W 61 81°24'0"W 62 63
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Young Rd West St Allene Rd East Rd
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Haverford Rd Swarthmore Dr Briarcli
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Captiva Bluff Rd Sapp Rd 44 81°35'
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Atomic St Hyatt Rd Camden Rd Tiny D
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Wade Rd 440 81°37'0"W 41 42 81°36
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Funding was provided by the Florida
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Duval County - Northeast Florida Regional Council

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