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<br />Mesa County, Colorado <br /> <br />Gold Star Canyon <br />Floodplain Information Report <br /> <br />Gold Star Canyon HEC-HMS SCS Hydrologic Parameters <br />Subbasin Lag Time Calculations <br /> <br />1.0 <br /> <br />P2= <br /> <br />SCS Lag Time <br />Total <br />Tc <br />{minl <br /> <br />Flow (Tt3) <br />Average ** <br />Velocity <br />(ft/s) <br />12 <br />11 <br /> <br />Channe <br /> <br />Flow <br />Length <br />{ftl <br /> <br />Shallow Concentrated Flow (Tt21 <br /> <br />SCS Lag* <br />(min) <br />25 <br />31 <br />16 <br />16 <br />16 <br />25 <br />19 <br />30 <br />30 <br />33 <br />28 <br />37 <br />38 <br />27 <br /> <br />42 <br />52 <br />27 <br />26 <br />27 <br />41 <br />32 <br />51 <br />51 <br />55 <br />47 <br />62 <br />64 <br />45 <br /> <br />Tt3 <br />(min) <br />7 <br />11 <br /> <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br /> <br />Tt2 <br />(min) <br />10 <br />15 <br />7 <br />7 <br />5 <br />33 <br />9 <br />28 <br />24 <br />27 <br />18 <br />30 <br />26 <br />25 <br /> <br />Tt1 <br />(min) <br />25 <br />25 <br />20 <br />20 <br />21 <br />8 <br />23 <br />23 <br />26 <br />29 <br />29 <br />32 <br />38 <br />20 <br /> <br />Tt3 <br />(hr) <br />0.12 <br />0.19 <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br /> <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br /> <br />Slope <br />(ft/ft) <br />0.13 <br />0.10 <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br /> <br />5,390 <br />7.570 <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br />o <br /> <br />Tt2 <br />(hr) <br />0.17 <br />0.26 <br />0.12 <br />0.11 <br />0.09 <br />0.56 <br />0.16 <br />0.46 <br />0.41 <br />0.44 <br />0.31 <br />0.49 <br />0.43 <br />0.42 <br /> <br />Average <br />Velocity (ft/sl <br />4.87 <br />4.59 <br />8.82 <br />8.66 <br />9.37 <br />5.10 <br />3.61 <br />2.79 <br />2.79 <br />2.79 <br />2.79 <br />2.28 <br />2.28 <br />2.79 <br /> <br />Paved or <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />Unpaved <br />UnQaved <br /> <br />Slope <br />(ft/ft) <br />0.09 <br />0.08 <br />0.30 <br />0.29 <br />0.34 <br />0.10 <br />0.05 <br />0.03 <br />0.03 <br />0.03 <br />0.03 <br />0.02 <br />0.02 <br />0.03 <br /> <br />Flow <br />Length <br />---1!!L <br />2,905 <br />4,230 <br />3,690 <br />3,570 <br />3,015 <br />10,250 <br />2,050 <br />4,650 <br />4,100 <br />4,450 <br />3,100 <br />4,040 <br />3,550 <br />4.250 <br /> <br />{Tt1} <br /> <br />Sheet Flow <br /> <br />Tt1 <br />(hr) <br />0.42 <br />0.42 <br />0.33 <br />0.33 <br />0.36 <br />0.13 <br />0.38 <br />0.38 <br />0.43 <br />0.48 <br />0.48 <br />0.53 <br />0.63 <br />0.33 <br /> <br />n <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br />0.13 <br /> <br />Slope <br />(ft/ft) <br />0.06 <br />0.05 <br />0.10 <br />0.10 <br />0.08 <br />1.00 <br />0.07 <br />0.07 <br />0.05 <br />0.04 <br />0.04 <br />0.03 <br />0.02 <br />0.10 <br /> <br />Flow <br />Length <br />(ft) <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br />300 <br /> <br />Total Flow <br />Length (ft) <br />8,595 <br />12,100 <br />3,990 <br />3,870 <br />3,315 <br />10,550 <br />2,350 <br />4,950 <br />4,400 <br />4,750 <br />3,400 <br />4,340 <br />3,850 <br />4.550 <br /> <br />Subwatershed <br />10 <br /> <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br /> <br />11 <br />12 <br />13 <br />14 <br /> <br />* Lag Time = 0.6(T c) <br />**Channel Velocity based on a <br /> <br />of 0.05 <br /> <br />and a Manmngs coefficient <br /> <br />Canyon HEC-HMS SCS Hydrologic Parameters <br />Subbasin Curve Number Calculations <br />Land Use <br /> <br />side slopes. 300cfs <br /> <br />2' base width. 3 <br /> <br />trapezoidal channel with a <br /> <br />Gold Star <br /> <br />Composite <br />SCS <br />Curve No. <br /> <br />% Type- <br />D <br />Soils <br /> <br />Type <br /> <br />% <br />Type-C <br />Soils <br /> <br />So <br /> <br />% <br />Type-B <br />Soils <br /> <br />% <br />Type-A <br />Soils <br /> <br />%Rock <br />(Natural Desert <br />Landscaping) <br /> <br />% Rangeland <br />Pinyon-juniper <br />(Fair <br />Condition) <br /> <br />% Residentia <br />(2 acres or <br />more) <br /> <br />% Residentia <br />(1/4 acre or <br />less) <br /> <br />9 <br /> <br />88 <br />89 <br />88 <br />86 <br />88 <br />75 <br />73 <br />69 <br />76 <br />70 <br />71 <br />75 <br />79 <br />78 <br /> <br />100 <br />100 <br />100 <br />100 <br />100 <br /> <br />86 <br />97 <br />89 <br />70 <br />84 <br />16 <br /> <br />14 <br />3 <br /> <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br /> <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br />50 <br /> <br />11 <br />30 <br />16 <br />34 <br />15 <br />35 <br />25 <br />40 <br /> <br />10 <br /> <br />50 <br />65 <br /> <br />50 <br />100 <br />50 <br /> <br />50 <br />35 <br /> <br />50 <br />100 <br />90 <br /> <br />75 <br />10 <br /> <br />Total <br />Drainage <br />Area <br />(sq. mi.) <br />410.8 <br />492.7 <br />132.7 <br />71.6 <br />133.9 <br />236.8 <br />53.4 <br />128.4 <br />125.1 <br />128.9 <br />85.5 <br />102.8 <br />106.8 <br />45.8 <br /> <br />Subbasin <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br /> <br />11 <br />12 <br />13 <br />14 <br />