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<br />6.
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<br />FAILURE OF ROAD STRUCTURES.
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<br />Of the 13 road structures and 4 darns
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<br />that were modeled, only 2 road structures will definitely fail if
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<br />subjected to flooding. The l4-foot * 6-foot concrete box on Sheep
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<br />Draw through County Road 25 will fail on the 500- and lOa-year
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<br />existing, projected urbanized, and fully urbanized conditions with
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<br />and without darns. In addition, the 50-year fully urbanized with and
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<br />without darns and the 10-year fully urbanized without dams will also
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<br />fail County Road 25 at Sheep Draw. A 24-inch corrugated metal pipe
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<br />located 2,200 feet south of Highway 34 on County Road 25 will fail on
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<br />the 500-year existing and projected urbanized conditions without darns
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<br />and on the 500-, 100-, and 50-year fully urbanized conditions with and
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<br />without dams. Failure of the gravel roads was assumed to occur if they
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<br />were overtopped by more than 2 feet.
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