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<br />.I <br />, <br /> <br />Possible larqer 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 se1d~ occur. <br />Consideration of floods of this magnitude may become important if <br />possible damages indicate the need of extremely high assurance that <br />flood risk oe eliminated. <br /> <br /> <br />Areas flooded and depths of floodinQ. The flood plain <br />areas along the North Fork Republican River in the vicinity of ~ray <br />that would be inundated by an Intermediate Regional Flood or Stand. <br />drd 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 />Depths of flow can be estimated from the flOOd profiles shown on <br />plate 6 and cross sections on plates 7 a.nd 8. <br /> <br />Fig. 5. <br /> <br />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 horizontal scale of 1 inch to 1,000 feet and were supplemented <br />by field investigations. The actual limits may vary from those <br />shown due to IIkIp limitations <lnO the contour interval used. Figures <br />5 through 14 indicate depths of flooding at selected locations. <br /> <br /> <br />'~~ <br />I,.... ._ <br /> <br />-- <br /> <br />-~x- <br /> <br />..~"...." '! <br /> <br />, <br /> <br />GANTS <br /> <br />I <br /> <br />Velocities. rates of rise, and duratIon. Water veloc- <br />ities during floods vary widely from place to place along the <br />stream. The size and shape of the ava.ilable flow-way area, the con- <br />dition of the stream, and the bed slope are all factors influencing <br />velocities. InWray,ll'.arkeddifferer.cesinwatervelOClti!soccur <br />throughout the study reach. The velocity in develope<i 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 Jarger Standard Project Flood. but <br /> <br />I <br /> <br /> <br /> <br />I <br /> <br />,INT. REG. ROOD <br /> <br />- <br /> <br />-<:::: <br />I <br /> <br />. <br /> <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 picture. <br /> <br />18 <br /> <br />19 <br />