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<br />Guide For Approximate Zone A Areas <br /> <br />Developing BFEs <br /> <br /> <br />~ <br /> <br />Figure 8 - Contour Interpolation Method - <br />Riverine Flooding Example 1 <br /> <br />Example 2 <br /> <br />Using aU. S. Geological Survey quadrangle map with a <br />contour interval of 10 feet, the approximate Zone A <br />boundary crosses contour elevations on the left and right <br />bank of 422 and 430 feet, respectively, as shown in <br />Figure 9, "Contour Interpolation Method Riverine <br />Flooding Example 2." The difference between these two <br />water-surface elevations is 8 feet, which is greater than <br />one-half of the contour interval or 5 feet. Therefore, <br />this method is not acceptable for use on this portion of <br />the stream, and another method must be used to determine <br />the BFE. <br /> <br />, <br /> <br />V-4 <br />