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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 />11 <br /> <br />of adequate protection of life and property. Present develop- <br />ment and continued future development of the contributing <br />watershed cause the frequent discharge (ll-year storm or <br />greater) over the present emergency spillway. A failure of the <br />dam embankment could result from a 40-year flood event or <br />greater. <br /> <br />FLOOD PLAIN AND FLOODWAY DATA <br /> <br />The limits of future flooding are outlined on the Flood <br /> <br /> <br />Hazard Area Delineation maps and tabulated in Table 6, <br /> <br /> <br />Flood Plain and Floodway Reference Data. The tables list <br /> <br /> <br />the potential flood discharge; flood elevation, flooding <br /> <br /> <br />widths and channel bottom elevations at each cross section <br /> <br /> <br />along the entire study reach. The 100-year water surface <br /> <br /> <br />profile, channel thalweg profile and flood plain limits at <br /> <br /> <br />any point in the study reach are graphically shown on the <br /> <br /> <br />maps. <br /> <br />Two floodways have also been computed for the study reach. <br />The floodway computations are based on passing the 100-year <br />flood with an equal degree of encroachment which results <br />in a total water surface elevation increase of (a) no more <br /> <br /> <br />than one foot and (b) no more than one-half foot. Floodway <br /> <br /> <br />widths, representing the limit of encroachment into the <br /> <br /> <br />flood plain at each cross section used in the computation, <br /> <br /> <br />are tabulated in Table 6. The water surface elevations to <br /> <br /> <br />be expected after encroachment are also tabulated. When the <br /> <br /> <br />100-year flood is contained within the defined channel, <br /> <br /> <br />this condition is so indicated in the table. <br />