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<br />I' <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />il <br />I <br />I <br />.1 <br />II <br />I <br />I <br />I <br />I <br /> <br />Unacceptable hazard was quantified in this study by scientific <br />calculations of flood water affects on human beings based on <br />certain assumptions. For the purpose of this analysis, the <br />human form was considered to be a "body monolith" composed <br />of a rectangular block with the broad face situated perpendicular <br />(normal) to flood flows. Unacceptably high hazard was <br />calculated as the point where instability arises for a person <br />standing in the flood waters. Instability may occur in the fonn <br />of slippage (loss of footing), toppling moment (knocked over by <br />the force of water) or buoyancy (floating away). The instability <br />was found to vary depending upon many factors including the <br />weight of the individual, the depth of flow and flood water <br />velocity. As a way to quantify this concept for regulatory <br />purposes, that combination of depth of flow and flood velocity <br />which causes instability was calculated for individual weight <br />categories over an appropriate range of depths and velocities, <br />and subjected to an analysis of the sensitivity of the assumptions <br />used. Product numbers were then calculated by multiplying <br />these depths by their respective hazard causing velocities. <br /> <br />....-I,.,.....'.,.f_......' <br />_d!Il'Il_lI_e <br /> <br />- "..~.....:~..~, :::::.:: =..~ .;.... <br /> <br />..... ...... ...... ..~~...... <br />...- ." '.. ..... -............ <br /> <br />.......,"''1.." <br />-'--"'0.'011"'. <br /> <br />. <br />. , <br />...,. <br /> <br />The scientific calculations using base assumptions stated in this analysis show that the product <br />numbers representing hazard vary from 0.6 to 6.6 depending upon weight, depth of flow, and <br />velocity. Average product numbers for individual weight categories vary from 1.5 to 5.3. <br /> Product Number as a Function of Weight <br /> W~ipht IIbs) <br />.IWUh ....JlL ~ ...!lL ill ill ill ill ill <br />0.40 1.74 2.72 3.44 3.44 3.89 4.29 4.14 4.44 <br />0.60 1.87 3.18 4.09 4.09 4.65 5.16 4.96 5.35 <br />0.80 1.82 3.48 4.57 4.57 5.24 5.84 5.61 6.06 <br />1.00 1.56 3.66 4.94 4.94 5.71 6.40 6.13 6.65 <br />1.20 0.84 3.42 4.76 4.76 5.56 6.26 5.99 6.52 <br />1.40 3.16 4.58 4.58 5.41 6.12 5.85 6.39 <br />1.60 2.88 4.39 4.39 5.25 5.98 5.70 6.25 <br />1.80 2.56 4.19 4.19 5.08 5.83 5.54 6.11 <br />2.00 2.20 3.98 3.98 4.91 5.69 5.39 5.97 <br />2.20 1.77 3.76 3.76 4.73 5.53 5.23 5.82 <br />2.40 1.19 3.52 3.52 4.54 5.38 5.06 5.67 <br />2.60 3.27 3.27 4.35 5.21 4.89 5.52 <br />2.80 3.00 3.00 4.15 5.05 4.71 5.36 <br />3.00 2.69 2.69 3.94 4.87 4.52 5.20 <br />3.20 2.35 2.35 3.71 4.69 4.33 5.03 <br />3.40 1.96 1.96 3.47 4.51 4.13 4.86 <br />3.60 1.45 1.45 3.22 4.3t 3.9t 4.68 <br />3.80 0.63 0.63 2.94 4.11 3.69 4.49 <br />4.00 2.63 3.90 3.45 4.30 <br />Ave 1.55 2.63 3.34 3.34 4.22 5.02 4.77 5.32 <br /> Average 90 -180 lbs = 4.0 <br /> Average 30 -180 lbs = 3.4 <br /> Average 30 -240 lbs = 3.8 <br /> - ii - <br />