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<br />. <br /> <br />e <br /> <br />e <br /> <br />FLOODPLAIN REPORT - Tyra Tract D and Sawmill Gulch, Breckenridge, Colorado <br /> <br />Finally, it should be noted that the Town of Breckenridge ultimately intends to connect a <br />continuing storm sewer system to the eastern end of the Type R structure to provide an <br />underground storm sewer system that conveys water eastward along Four O'Clock Road towards <br />the Blue River. Specific design criteria have not yet been defmed. For now, however, the water <br />will discharge to the shoulder area of Four O'Clock Road as would occur in the pre-project <br />conditions. The existing roadside swale is capable of accommodating the flow in the vicinity of <br />Tyra Tract D. <br /> <br />MISCELLANEOUS CONSIDERATIONS <br /> <br />The structures proposed will be maintained by the Town of Breckenridge as part of their <br /> <br /> <br />stormwater system. A letter to that effect is included herein as Attachment E. <br /> <br />The collection system structures are likely to operate infrequently. Flows approaching the 50- <br />year event are necessary to provide sufficient flows to overtop the banks of Sawmill Gulch. <br />During smaller, more frequent events, only minor, essentially negligible flows from tributary <br />areas will reach the system. Approximately 1/3 to 1/2 acre of undeveloped land drains to the <br />upper collection system and its 48-inch pipe, and the lower collection system has no tributary <br />area. <br /> <br />Ice or snow accumulations are possible, as with any system at over 9,000 feet in elevation. <br />However, winter conditions are likely to provide only negligible amounts of "frequent" flow to <br />the structures. Major events, such as the 50-year storm or greater, are most likely to occur during <br />spring snowmelt or summer thunderstorms, generally periods when ice is not a severe problem. <br />Should significant blockage occur, the Town maintenance personnel should clear the system as <br />they do for their existing storm systems. <br /> <br />No existing sedimentation problems have been identified on Sawmill Gulch, and therefore no <br />future problems are anticipated. <br /> <br />971-055.010 <br /> <br />Wright Water Enginee~, Inc. <br /> <br />Page 19 <br />