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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 />2.1.2 Recommended FIS Flood Hydrology <br />The flood hydrology of the Blue River and tributaries is summarized in tables 7 and <br /> <br />8. <br /> <br />Table 7. Blue River Flood Hydrology - Peak Flows in cfs <br />Blue River Reach Basin Area QIO Qso <br />below Dillon Dam 335.0 2500 3100 <br />above Straight Cr. 336.1 2510 3110 <br />below Straight Cr. 355.8 2620 3260 <br />above Willow Cr. 362.7 2660 3310 <br />below Willow Cr. 376.6 2740 3410 <br />above Hamilton Cr. 380.0 2760 3440 <br />below Hamilton Cr. 381.5 2770 3450 <br />above Bushee Cr. 383.8 2780 3470 <br />below Bushee Cr. 390.3 2820 3520 <br />above Maryland Cr. 394.7 2840 3550 <br /> <br />QIOO <br />3350 <br />3360 <br />3520 <br />3580 <br />3700 <br />3730 <br />3740 <br />3760 <br />3810 <br />3850 <br /> <br />Qsoo <br />3800 <br />3810 <br />4010 <br />4080 <br />4220 <br />4260 <br />4280 <br />4300 <br />4370 <br />4420 <br /> <br />Table 8. Blue River Tributaries <br />Tributary Area QIO Qso QlOO Qsoo <br />Straight Cr. at Blue River 19.7 393 504 550 652 <br />Straight Cr. at Laskey Gulch 18.3 374 478 522 619 <br />Willow Cr. at Blue River 13.9 309 394 430 508 <br /> <br />2.1.4 Supporting Information <br />Item No. <br />Pages <br />1 <br />1 <br /> <br />1 <br /> <br />6 <br />3 <br /> <br />7 <br /> <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br /> <br />7 <br />8 <br /> <br />9 <br /> <br />8 <br />8 <br /> <br />13 <br /> <br />Description <br />Figure 1. Ranked Flow Data Blue River Below Dillon Dam <br />Figure 2. Linear I Non-Linear Comparison <br /> <br />Blue River - Tributary Drainage Basins <br /> <br />HEC-FF A Flood Frequency Analysis Blue River below Dillon, Co. <br />HEC-FF A Flood Frequency Analysis Blue River near Dillon, Co <br /> <br />Selected portions of USGS WRI 96-xxxx <br />"Analysis of the Magnitude and Frequency of Floods in Colorado" <br /> <br />HEC-l Input I Output - Rainfall Runoff Model of Split Creek <br /> <br />HEC-l Input I Output - Rainfall Runoff Model of Unnamed Trib. <br />Willow Creek <br />Rainfall Analysis - DepthlDurationIFrequency for NOAA Atlas <br /> <br />2.2 Hydraulic Analysis <br /> <br />Three water surfac:e profile models were created for the Town of Silverthorne: Blue <br />River, Straight Creek, and Willow Creek. The floodplains of the Blue River and Straight <br />Creek are mountain valleys with well define stream channels. The floodplain of Willow <br />