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- 20 - FLOODED AREAS AND FLOOD DAMAGES The areas along the Blue River through the town of Breckenridge that would be inundated by the Intermediate Regional and Standard Project Floods are shown on Plates 4 through 10. Plate 3 is an index map showing the relative location of the plates within the town of Breckenridge. \:, During floods, debris collecting on bridges or culverts decreases the flow carrying capacity and causes greater water depths upstream of the structures than would have occurred without them. The maps and illustrations reflect consideration of the channel as it exists today and show the backwater effects with the crossings assumed completely plugged with debris. With few exceptions the primary cause of flooding outside of the banks is caused by debris accumulation plugging the crossing structure. Between the Village Road and Lincoln Ave. crossings flood flows leave the banks on the east side of the channel due to inadequate channel capacity. In addition to the crossing structures, the Four Seasons Pond dam also causes localized flooding. Due to the steepness of the channels in the upper or southern portion of the reach, flood flows would normally be contained within the channel banks with the exception of these obstructions. I \ l' \ , r At the Four Seasons Pond both the Intermediate Regional and Standard Project Floods are forced out of the banks of the channel and localized flooding occurs. Flood waters of both events, however, are generally contained in the area west of Highway 9. \ ~ Between the Village Road and Lincoln Ave. crossings the channel of the Blue River on the east side is not adequate to pass either the Intermediate Regional or Standard Project Floods. The water will leave the bank near the existing pedestrian bridge crossing between these two roads. Once ~ Leonard Rice Consulting Water Engineers, Inc.