Laserfiche WebLink
<br />:1 <br />~ <br />'I <br />I Creek Name <br /> {Sub basin} <br />I Piney Creek <br />I PC-5 <br />PC-4 <br />I PC-3 <br /> PC-2 <br />I PC-l <br />I Cottonwood Creek <br />CC-3 <br />I CC-2 <br />CC-l <br />I Lone Tree Creek <br /> LC-2 <br />I LC-l <br /> Murphy Creek <br />I MC-4 <br /> MC-3 <br />I MC-2 <br /> MC-l <br />I <br />I <br />I <br />I <br />I <br /> <br />Table 4 <br /> <br />Drainage Basin Parameters <br /> <br />Area <br /> <br />(Sq. Mi.) (Mi.) <br /> <br />Length <br /> <br />6.93 <br /> <br />2.72 <br /> <br />5.40 <br /> <br />2.63 <br /> <br />4.22 <br /> <br />2,86 <br /> <br />0.95 <br /> <br />4.85 <br /> <br />0.80 <br />0.94 <br /> <br />2.70 <br /> <br />2.51 <br /> <br />3.18 <br /> <br />3.83 <br /> <br />5.70 <br /> <br />3.44 <br /> <br />2.54 <br /> <br />4.24 <br /> <br />4.65 <br /> <br />4.20 <br /> <br />2.35 <br /> <br />3.70 <br /> <br />1. 70 <br /> <br />1. 82 <br /> <br />3.82 <br /> <br />2.66 <br />3.64 <br /> <br />2.56 <br /> <br />Lca <br /> <br />(Mi.) <br /> <br />2.80 <br /> <br />1. 52 <br /> <br />1.55 <br /> <br />2.06 <br /> <br />3.02 <br /> <br />2.10 <br /> <br />1. 06 <br />1. 95 <br /> <br />0.80 <br /> <br />1. 29 <br /> <br />1. 78 <br /> <br />1. 67 <br />2.57 <br /> <br />2.28 <br /> <br />Future <br />Perv. <br /> <br />(%) <br /> <br />93 <br />93 <br />87 <br />88 <br /> <br />80 <br /> <br />44 <br /> <br />31 <br /> <br />26 <br /> <br />47 <br /> <br />36 <br /> <br />95 <br /> <br />95 <br /> <br />80 <br />49 <br /> <br />Slope <br /> <br />(%) <br /> <br />1.7 <br /> <br />2.0 <br /> <br />0.9 <br /> <br />2.0 <br /> <br />0.6 <br /> <br />2.5 <br />1.9 <br />0.9 <br /> <br />2.1 <br /> <br />1.0 <br /> <br />2.0 <br /> <br />0.6 <br /> <br />0.6 <br /> <br />0.5 <br /> <br />Ct <br /> <br />.42 <br /> <br />.38 <br /> <br />.38 <br />.36 <br /> <br />.38 <br /> <br />.25 <br /> <br />.23 <br /> <br />.21 <br /> <br />.31 <br /> <br />.25 <br /> <br />.43 <br /> <br />.43 <br />.38 <br /> <br />.29 <br /> <br />8 <br /> <br />Typical flood hydrographs for each stream are provided in Figures <br /> <br />5 and 6. Also, Discharge Profiles for Piney Creek and Cottonwood <br /> <br />C <br />P <br /> <br />Creek are provided in Figures 7 and for Murphy Creek and Lone Tree <br /> <br />Creek in Figure 8. These charts represent the peak discharge at <br /> <br /> <br />any point within the basin for the 10-, 50- and 100-year storm <br /> <br />frequencies. <br /> <br />.53 <br /> <br />.58 <br /> <br />The magnitudes of the 100-year flood event in this study are, <br /> <br />.55 <br />.58 <br /> <br />in most cases, equivalent to those used by the Federal Insurance <br /> <br />Administration FIS. Table 5 lists the flood frequencies and <br /> <br />.50 <br /> <br />discharges used in this study for each of the streams at selected <br /> <br />reference points. The magnitude of the 100-year flood event for <br /> <br />.49 <br /> <br />the FIS is listed in Table 5 in parenthesis. <br /> <br />.47 <br /> <br />Table 5 <br /> <br />.41 <br /> <br />Flood Frequency and Discharge <br /> <br />Location <br /> <br />10-Year <br />(ds) <br /> <br />50-Year <br />(cfs) <br /> <br />100-Year <br />(cfs) <br /> <br />.46 <br /> <br />.42 <br /> <br />Piney Creek <br />Mouth <br />Arapahoe Rd. <br /> <br />9800 {9400}" <br />8400 <br /> <br />5300 <br />4800 <br /> <br />8450 <br />7600 <br /> <br />.53 <br />.53 <br />.51 <br />.45 <br /> <br />Cottonwood Creek <br />Mouth <br />Arapahoe/Doug- <br />las Co. Line <br /> <br />3250 <br /> <br />5850 <br />2500 <br /> <br />8000 <br /> <br />8750 (6600) * <br />3550 <br /> <br />Murphy Creek <br />Mouth <br />Airline Rd. <br /> <br />3600 <br />1250 <br /> <br />4450 (4450) * <br />1500 <br /> <br />2100 <br />800 <br /> <br />Lone Tree Creek <br />Mouth <br /> <br />1400 <br /> <br />1850 <br /> <br />2000 <br /> <br />*lOO-Year flood, Arapahoe County FIS <br />