Book 4: Pinellas County Storm Tide Atlas - Tampa Bay Regional ...

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Volume 7-8 Tampa Bay Statewide Regional Evacuation Studies Program VARIATIONS TO CONSIDER Variations between modeled versus actual measured storm tide elevations are typical of current technology in coastal storm surge modeling. In interpreting the data emergency planners should recognize the uncertainties characteristic of mathematical models and severe weather systems such as hurricanes. The storm tide elevations developed for this study and presented in the Storm Tide Atlas should be used as guideline information for planning purposes. Storm Tide & Wave Height Regarding interpretation of the data, it is important to understand that the configuration and depth (bathymetry) of the Gulf bottom will have a bearing on surge and wave heights. A narrow shelf, or one that drops steeply from the shoreline and subsequently produces deep water in close proximity to the shoreline, tends to produce a lower surge but a higher and more powerful wave. Those regions, like the Tampa Bay Region, which have a gently sloping shelf and shallower normal water depths, can expect a higher surge but smaller waves. The reason this occurs is because a surge in deeper water can be dispersed down and out away from the hurricane. However, once that surge reaches a shallow gently sloping shelf it can no longer be dispersed away from the hurricane, consequently water Apiles up@ as it is driven ashore by the wind stresses of the hurricane. Wave height is NOT calculated by the SLOSH model and is not reflected within the storm tide delineations. Forward Speed Under actual storm conditions it may be expected that a hurricane moving at a slower speed could have higher coastal storm tides than those depicted from model results. At the same time, a fast moving hurricane would have less time to move storm surge water up river courses to more inland areas. For example, a minimal hurricane or a storm further off the coast such as Hurricane Elena (1985), which stalled 90 miles off the Tampa Bay coast for several tidal cycles, could cause extensive beach erosion and move large quantities of water into interior lowland areas. In the newest version of the Tampa Bay SLOSH model, for each set of tracks in a specific direction, storms were run at forward speeds of 5, 10, 15 and 25 mph. Radius of Maximum Winds As indicated previously, the size of the storm or radius of maximum winds (RMW) can have a significant impact on storm surge especially in bay areas and along the Gulf of Mexico. All of the hypothetical storms were run at two different sizes, 25 mile radius of maximum winds and 30 mile radius of maximum winds. Astronomical Tides Surge heights were provided by NOAA for both mean tide and high tide. Both tide levels are referenced to North American Vertical Datum of 1988. The storm tide limits reflect high tide in the region. Volume 7: Storm Tide Atlas Page 15
Volume 7-8 Tampa Bay Statewide Regional Evacuation Studies Program Accuracy As part of the Statewide Regional Evacuation Study, all coastal areas as well as areas surrounding Lake Okeechobee were mapped using remote-sensing laser terrain mapping (LIDAR 4 ) providing the most comprehensive, accurate and precise topographic data for this analysis. As a general rule, the vertical accuracy of the laser mapping is within a 15 centimeter tolerance. However, it should be noted that the accuracy of these elevations is limited to the precision and tolerance in which the horizontal accuracy for any given point is recorded. Other factors such as artifact removal algorithms (that remove buildings and trees) can affect the recorded elevation in a particular location. For the purposes of this study, the horizontal accuracy cannot be assumed to be greater than that of a standard USGS 7 minute quadrangle map, or a scale of 1:24,000. POINTS OF REFERENCE County emergency management agencies selected reference points which include key facilities or locations critical for emergency operations. The table below includes the map identification number, descriptions of the selected points and the elevation of the site. The elevation is based on the digital elevation data provided by the LIDAR. It should be noted that if the site is large, elevations may vary significantly. The table also provides the storm tide value from the SLOSH value and the depth of inundation (storm tide value minus the ground elevation) at the site. 4 Light Imaging Detection and Ranging Page 16 Volume 7: Storm Tide Atlas
Page 1 and 2: Florida Statewide Regional Evacuati
Page 3 and 4: Volume 7-8 Tampa Bay Statewide Regi
Page 5 and 6: Volume 7-8 Tampa Bay LIST OF MAPS (
Page 9 and 10: Volume 7-8 Tampa Bay Table 1 Statew
Page 11 and 12: Volume 7-8 Tampa Bay The Grid for t
Page 15: Volume 7-8 Tampa Bay Statewide Regi
Page 23 and 24: 32 82°42'0"W 33 34 82°41'0"W 35 8
Page 25 and 26: 27°42'0"N 32 82°42'0"W 33 34 82°
Page 27 and 28: Ramp Pt Aloha Dr 2nd St 1st St Palm
Page 29 and 30: 20th Ln S 2nd St 82°40'0"W 27°44'
Page 31 and 32: Corey Way The Pinellas Trl S Cir Dr
Page 33 and 34: Alley Treasure Ct 18th St 11th St J
Page 35 and 36: 27°50'0"N Lee Ave 180th Ave A Ave
Page 37 and 38: 73rd St 72nd St Anvil St 70th Ln 70
Page 39 and 40: 26 Onyx St 1st St W a Rd D 27°50'0
Page 41 and 42: 141st St Cir 6th Way 85 23.8 ft D 8
Page 43 and 44: 112thPl 108th 106th Ln eUnnamed Str
Page 45 and 46: 52nd Ln 52nd St 52nd 7 50th St 46th
Page 47 and 48: Dr 16th Ct 3 40 82°37'0"W 41 42 82
Page 49 and 50: Bamboo Ln Mia Cir Sophia Cir C Suns
Page 51 and 52: Sho L Oro Ct Dr Senora St 73rd St M
Page 53 and 54: Fri U y 7th Ln 36 82°40'0"W 37 82
Page 55 and 56: 16 82°52'0"W 17 18 82°51'0"W 19 8
Page 57 and 58: 6th St Sunny Park Rd Wood St Keysto
Page 59 and 60: Dr K St 27°58'0"N Parking Lot Entr
Page 61 and 62: West Ave Pineland Dr Chenango Ave S
Page 63 and 64: Harbor Cove St Cir r Ct Railroad Av
Page 65 and 66: 82°50'0"W 3 20 21 82°49'0"W 22 23
Page 67 and 68:
Halsey BlackwoodCir Fiesta Dr Dr Co
Page 69 and 70:
C Rd Ilene Dr Dr St Pelican Dr 36 8
Page 71 and 72:
3 20 82°50'0"W 21 82°49'0"W 22 23
Page 73 and 74:
Cherry Laurel Dr Leprechaun Kelly G
Page 75 and 76:
28°6'0"N Forest Lakes Blvd 36 82°
Page 77 and 78:
Dora Ave Polly Dr Pineridge Dr Dolp
Page 79 and 80:
Dr Carnoustie 36 82°40'0"W 37 38 8
Page 81 and 82:
3 20 82°50'0"W 21 82°49'0"W 22 23
Page 83 and 84:
Hama Dr Waterview Dr Julie Ln Grand
Page 85:
Rd 27.8 ft D 31 31 20 20 28°11'0"N
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