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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 />The flow vel ociti es in the channel s of the studied streams generally range <br />between six and ten feet per second (fps) with maximum channel velocities <br />exceeding 12 to 15 fps along the channelized portion of Tucker Gulch and in <br />the upper study reaches. High velocity flows are also characteristic of <br />street flooding on Kenneys Run. Velocities in the overbank typically range <br />between zero and five fps. <br /> <br />- SUMMARY - <br /> <br />This report has identified the probable flooding limits resulting from the <br />occurrence of a 100-year runoff event in the Tucker Gulch and Kenneys Run <br />drainage basins. <br /> <br />Velocities in excess of six to eight fps can cause severe erosion of stream <br />banks. and are capable of transporting large rocks and debris. Velocities <br />in this range can also erode fill around bridge abutments. causing possible <br />bridge failure. Lower velocities of approximately two fps or less will <br />deposit debris and silt. <br /> <br />The floodplain limits are based on hydrologic information developed for <br />future basin considtions and existing floodplain and channel conditions <br />as shown on the maps. Floods of greater magnitude can and will occur in <br />which the limits of flooding will exceed those shown in this report. <br /> <br />Presently there are many areas where flooding may result in extensive flood <br />damages. Regulation of future floodplain construction activities will at <br />least serve to limit increases in the flood damage potential while any <br />improvements .will serve to minimize or reduce the potential for flood <br />damage. <br /> <br />23 <br />