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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />.J <br /> <br />(I6'~7 <br /> <br />b <br /> <br />FLOOD HYDROLOGY <br /> <br />.1 <br />1 <br />" <br />" <br />'" 1 <br /> <br />HYDROLOGIC DATA <br /> <br />Basic data stations that record information on precip- <br />itation, snow depth G,nd stream flow are available in the <br />Breckenridge area. The locations of these stations are <br />shown on Plate 1. The precipitation gage located at Brecken- <br />ridge is a daily station with records from 1947. The precip- <br />itation gage located at Dillon is an hourly recorder with <br />records dating back to 1907. <br /> <br />" <br />('1" "\ <br />, ~ <br />,f!l/I\ <br />\. ' <br /> <br />Snow course stations are maintained by the u.S. Department <br />of Agriculture, Soil Conservation Service. The stations measure <br />the snow depth and wa'ter content at intervals during the year. <br />There are three such stations in the Breckenridge area with <br />snow depths and water content information extending back 39 <br />years. <br /> <br />The U.S. Geological Survey maintains several continuously <br />recording stream gages in the immediate area. The station of <br />primary interest to the Breckenridge study is located immed- <br />iately downstream of the town and has been in existence since <br />1957. Another U.S. Geological Survey gage located further <br />down the stream was in existence since 1911; however, the <br />construction of the Dillon Reservoir required that the gage <br />be moved to its present location in 1957. From the combined <br />history of the two gages, there is 64 years of stream flow <br />records on the Blue River. <br /> <br />FLOOD SEASON AND FLOOD CHARACTERISTICS <br /> <br />Major flooding in the study area from the Blue River is <br />due primarily to late spring snowmelt-runoff which is character- <br />ized by moderate peaks, long duration of flows, large volumes <br />~d-diurnal fluctu~in discharge. Characteristics of a <br />hydrograph related to snowpack melt is a very gradual buildup <br />of the discharge of ' the river and an ~ttenuated p~ak. Compared <br />-.- -- <br />to a hydrograph resulting from rainfall, the average hydrograph <br />