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FLOOD07444
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Last modified
1/25/2010 7:11:47 PM
Creation date
10/5/2006 2:59:51 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
387
County
Summit
Community
Frisco
Basin
Colorado Mainstem
Title
Flood Insurance Study - Frisco, CO, Summit County
Date
11/1/1994
Designation Date
11/1/1994
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />slopes at about l.4 percent at Frisco, 2 percent in the canyon, <br />and 2.7 percent in the upper basin. The elevations in the basin <br />range from 13,000 feet above Copper Mountain to 9,000 feet at <br />Lake Dillon. The study reaches within this basin are portions of <br />Tenmile Creek adjacent to and within the Town of Frisco. <br /> <br />The Meadow Creek basin drains to the east from the Gore Range <br />into Dillon Reservoir at Frisco, just north of Lower Tenmile <br />Creek. The basin has a total drainage area of 5.8 square miles <br />and a length of 4.5 miles. The width of the basin varies from <br />1.0 to 1.5 miles. The channel slope averages 1.7 percent for the <br />study reach near Frisco while steeper slopes of 10.7 percent <br />exist above Frisco in the Gore Range. The elevations in the <br />basin range from 12,700 feet to 9,000 feet at Dillon Reservoir. <br />The study reaches within this basin are portions of Meadow Creek <br />adjacent to the Town of Frisco, with some segments located within <br />the Town's corporate limits. <br /> <br />Miners Creek Basin is located to the east of Tenmile Range, with <br />the ridge to the east of Peak 4 being the southern boundary of <br />the basin. The basin has a drainage area of 6.8 square miles <br />which drains east into Miners Creek, then north to Dillon <br />Reservoir. Jug Creek and No Name Creek are tributaries of Miners <br />Creek. The study reach within the basin is a segment along <br />Miners Creek. <br /> <br />The Hydrology Report for the Summit County Flood Insurance <br />Studies completed in 1978 (Reference l4) contained the discharge- <br />frequency data that are tabulated in the published Flood <br />Insurance Study. Stream gage data for a particular study reach <br />was statistically analyzed to compute peak flow rates for <br />specific recurrence intervals. This was done for the Snake River <br />using data from Gage No. 475, and for Tenmile Creek using data <br />from Gage No. SOl. Adjustments for locations other than at the <br />gage station were made by making a discharge versus drainage area <br />comparison. <br /> <br />A regional regression analysis was performed to provide a basis <br />for estimating flows from ungaged drainage basins having similar <br />characteristics of gaged drainage basins. A single variable <br />(drainage area) algorithm was developed from the regression <br />analysis for each selected flood frequency. These algorithms <br />were converted into a graphical depiction (Reference 14) of <br />drainage area versus peak flow rate with each line representing <br />all values of the same frequency event. <br /> <br />For smaller basins (less than 30 square miles), the rainfall <br />events were investigated using the Soil Conservation Service <br />(SCS) TR-20 model. The 500-year peak flow due to rainfall was <br />found to be much higher than the 500-year peak flow due to <br />snowmelt. The 50-, lOO-, and 500-year regression lines were <br />modified to incorporate the discharge versus drainage area <br />relationship obtained by the SCS procedure. <br /> <br />18 <br />
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