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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 />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />18 <br /> <br />Floodplain and Floodway Data <br /> <br /> <br />The limits of future flooding are outlined on the FHAD maps <br /> <br /> <br />and tabulated 1n Tables 5 through 7, floodplain and floodway <br /> <br />reference data. The tables list the 100-year floodplain and <br /> <br /> <br />floodway width and 100-year water surface elevation with and <br /> <br /> <br />wi thout f loodway at each cross section along the study reach. <br /> <br /> <br />The 10- and 100-year water surface profile, channel thalweg <br /> <br /> <br />profile, and 100-year floodplain limits at any point in the study <br /> <br /> <br />reach are graphically shown on the Sheets 1 through 14. <br /> <br /> <br />Two floodways have been computed for the study reach. The <br /> <br /> <br />floodway computations are based on passing the lOO-year flood <br /> <br /> <br />width an equal degree of encroachment on both sides of the <br /> <br /> <br />channel, which results 1n a total water surface elevation <br /> <br /> <br />1ncrease of no more than one foot, as well as six-inches, over <br /> <br />the existing flood profile. Floodway widths, representing the <br /> <br /> <br />limit of encroachment into the floodplain at each cross section <br /> <br />used in the computation, are tabulated in Tables 5 through 7. <br /> <br /> <br />The water surface elevations to be expected after encroachment <br /> <br />are also tabulated. <br /> <br />~ <br />