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Chapter•5:Hazard Analysis—Tropical Cyclones <br /> river valleys in these special regions can develop speeds that are substantially higher than the <br /> values indicated on the default map. The Hawaii State Building Code provides maps showing <br /> the net effect of such topography. <br /> 185 <br /> 180 <br /> 175 174 <br /> 170 <br /> 165 10 1 <br /> 160 <br /> 15.5 <br /> 150 <br /> 145 X43 <br /> 140 <br /> 135 <br /> 130 <br /> Peak Gust 120 <br /> Windspeed 115 <br /> 13 <br /> (mph) 110 <br /> 10.5 <br /> 100 <br /> ss <br /> 50 1 P51/ i <br /> 85 <br /> 80 <br /> 75 <br /> 70 <br /> 65 67 <br /> 60 <br /> 55 <br /> 50 <br /> 45 <br /> 40 <br /> Governed Governed by Hurricanes <br /> 3o by slorms <br /> zs <br /> 20 <br /> 15 <br /> 10 <br /> 5 <br /> 0 <br /> 10 100 1000 10000 Years <br /> Figure 5-6. Wind speed recurrence intervals for Hawaii(from ASCE 7-2010 Standard) <br /> '1'.4RLR C6-2 APPROXIMATE.RELATIONSHIP BETWEEN WIND SPEEDS IN ASCE 7 10 <br /> AND SAFFIR/SIMPSON HURRICANE SCALE <br /> Sat'15r/Simpson Sustained Wind Gust Wind Speed Over Gust Wind Speed <br /> Hurricane Speed Over Water" Water" Over Land` <br /> Category Mph (eu/s) mph (m/s) mph (eu/s) <br /> 1 74-95 33-43 87-111 39-50 81-105 36-47 <br /> 2 96-110 44-49 112-129 51-58 106-121 48-54 <br /> 3 111-134) 54-58 130-152 59-68 122-143 55-64 <br /> 4 131-155 59-69 153-181 69-81 144-171 65-76 <br /> 5 >155 >69 >181 >81.0 >171 >76 <br /> "I-minure average wind speed at 33 ft(0 m)above open water <br /> -.second rst wind.speed at 33 ft(10 m)above open water <br /> `3-second gust wind speed at 33 R f 1 m)above open ground in Exposwc Category C.This column has the same <br /> basis(avcragmg nme„heigh4 and exposure)as the basic wind spcud fiom Fig.6-1. <br /> Figure 5-7. ASCE 7-10 relationship between Saflir/Simpson category and wind speed <br /> 5-11 Hawaii County Multi-Hazard Mitigation Plan <br />