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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />:1 <br />I <br />.1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />, TABLE5- (Cant.) <br /> <br />DISTANCE FROM TOP <br />OF STUDY AREA <br />-Feet- <br /> <br />STREAM BED <br />ELEVATION <br />-Feet- <br /> <br />FLOOD <br />ELEVATION <br />-Feet- <br /> <br />MEAN VELOCITY <br />FEET PER SECOND <br /> <br />Seperated flow below lower bridge and west of channel: <br /> <br />260' below road <br /> <br />6704.8 <br /> <br />6708.4 <br /> <br />3.6 <br />6.5 <br />8.8 <br /> <br />736 <br /> <br />6702.4 <br /> <br />6705.0 <br />6702.3 <br /> <br />1155 <br /> <br />6700 <br /> <br /> The following are the flood plain descriptions as they cross <br />the tlvO County Road Bridges. <br />TABLE 6 - Flood Plain at ~ounty Road Bridges <br />BRIDGE TOP OF BRIDGE BOTTOM OF GIRDER FLOOD ELEVATION <br /> ELEVATION-FEET ELEVATION-FEET FEET <br />State Hwy 217 6748.0 6745 . 3 6748.4 <br />County Road 6718.0 6716.0 6713.2 <br /> <br />The lower bridge cannot contain the entire runoff, as the western <br />approach is well below the flood elevation, causing water to overtop the <br />road west of the bridge as shown on plate number two. ' <br /> <br />The sewage treatment facilities are not inundated by the projected <br />flood due to the dikes surrounding the plant. The Town's well is inundated, <br />however and a loss of water service is possible. <br /> <br />It may be noted in the previous tables that the velocity of the <br />water is quite high, and will undoubtably cause sever erosion of the banks, <br />except along the dike, which is protected with riprap and should be stable. <br />It is anticipated that both bridges will wash out near the abutments, and <br />the possibility of their total loss is quite strong. <br /> <br />10 <br /> <br />----.- _. ,.---. "'~''''-'~'--'' --..,..,.._" <br /> <br />..~>.,-~...._"-^".,-_.._--' ~.".." <br />