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<br />Areas flooded and depths of flooding. The flood plain <br />areas along the North Fork Republican River in the vicinity of Wray <br />that would be inundated by an Intermediate Regional Flood or Stand- <br />ard Project Flood are shown on plates 3 through 5. An index map <br />showing the general relationship of these areas is found on plate 2. <br />Oepths of flow can be estimated from the flood profiles shown on <br />plate 6 and cross sections on plates 7 and 8. <br /> <br />I <br />I <br />I <br />. <br />I <br /> <br /> <br />Possible larger floods. Floods larger th.n the Stand. <br />ard Project Flood are possible; however, the combination of factors <br />that would be necessary to produce such floods would seldom occur. <br />Consideration of floods of this ~gnitude may become important if <br />possible damages indicate the need of extremely high assurance that <br />flood risk be eliminated. <br /> <br />Fig. 5. City power facilities located just upstream of <br />the Chicago, Burlington & Quincy Railroad bridge. <br /> <br />Limits of the flooded areas shown on the plates were <br />determined from topographic maps with a ten-foot contour interval <br />and a hori~ontal scale of I inch to 1,000 feet and were supplemented <br />by field investigations. The actual limits may vary from those <br />shown due to map limitations and the contour interval used. Figures <br />5 through 14 indicate depths of flooding at selected locations. <br /> <br /> <br />-- <br /> <br />..J <br />GANTS I <br />., I <br />~!, <br /> <br />- <br /> <br />'."t <br /> <br />. <br />. <br /> <br />Velocities, rates of rise, and duration. Water yeloc- <br />ities during floods vary widely from place to place along the <br />stream. The si~e and shape of the available flow-way area, the con- <br />dition of the stream, and the bed slope are all factors influencing <br />veloc1ties. In Wray, marked differences in water velocities occur <br />throughout the study reach. The velocity in developed areas <br />increases as floodwaters are forced to flow around buildings and <br />other obstacles not designed for water passage. Velocities gener- <br />ated by a flood of Intermediate Regional Flood proportions would <br />generally be lower than the much larger Standard ProjectFlood,but <br /> <br />. <br />, <br />, ~ <br />'. <br />, <br />I <br /> <br /> <br />., <br /> <br />.)NT. R€G. FLOOD <br /> <br />--t:::[ <br /> <br />",. <br />" <br /> <br />"" <br /> <br />Fig. 6. <br /> <br />Furniture store on east side of Main Street <br />between 2nd and 3rd Streets. Note location of <br />channel at left of p1cture. <br /> <br />18 <br /> <br />19 <br />