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<br />flood plain. The reference flood is used as the mechanism for defining the <br />flood plain in the same manner as described in the computation of flood <br />proofing each cell to a uniform protection level. The difference between <br />the flood proofing to a target protection level and permanent evacuation of <br />a flood plain is that instead of a truncated elevation damage function. a <br />no-damage function will be aggregated to the index location. <br /> <br />Fig. 7 Multiple Flood Elevations shows part C of Fig. 6 from the previous <br />section. If the flood plain elevation for the grid cell was 423.0 feet <br />(Flood #1), the land use occupying the grid cell would have to be removed and <br />a no-damage potential would be aggregated to the index location. An inter- <br />esting point can be made by examining the situation for Flood #2 (water <br />surface elevation of 419.0 feet). The grid cell would be considered outside <br />the flood plain of interest. but if the flood plain event occured the grid <br />cell would incur damages. Therefore. there is an option in the program to <br />permanently evacuate either a specified flood plain or all of the grid cells <br />which have damageable elevations inside the flood plain. If the latter <br />evaluation is made for the grid cell shown in Fig. 7. the flood plain ele- <br />vation would have to be lower than 418.0 feet in order for the land use to <br />remain. <br /> <br />426 <br />425, <br />424 <br />423 <br />422 <br />421 <br /> <br />420 <br />419 <br />418 <br /> <br /> <br />Flood Elevation <br /> <br />Ground Floor <br />Flood #2 <br /> <br />Damage <br /> <br />FIG. 7.--Multiple Flood Elevations <br /> <br />15 <br />