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Home My WebLink About01-00500272- 00075679EXHIBIT B Rational Formula Drainage Area Calculations CANYON CREEK TOWNHOMES w 3 3 W a O a O Q Ui U. O w U O z Q G Z p Z LL -j LL Z Q W J W W U W H W U F QJ W Q > W Q (7 d' �Z �J c1 W O Q Q O >W >J Q W Q -i W 16 U) N Ln O LO N p C a H OJ OLL 0J OLL > U M N a u) a = a N a Ln O = C7 NO. AC. 0.4 0.6 0.9 ft. ft. ft. ft. ft/s min min In /Hr cfs In /Hr cfs In /Hr cfs In /Hr cfs In /Hr cfs In /Hr cfs Basin 62.40 46.80 0.00 115.60132.761 607.4 1 4.2 12087 .0 34.0 1 1.4 'Al ni 9n ()I 4.43 I 145.2 5.5 179.5 6.2 203.4 7.1 233.2 8.1 264.7 9.1 298.9 add 0.85 0.67 0.00 0.18 0.43 0.0 0.0 0.0 0.0 10.4 0.0 10.0 6.33 2.7 7.7 3.3 8.6 3.7 9.9 4.2 11.1 4.8 12.5 5.4 TOTAL 147.9 182.81 1207.11 237.5 1 269.5 304.3 12/10/01 EXHIBIT B 0 122-1 00yr flood.As Computed Water Surface Elevations for 10 and 100 -year Events HEC -RAS 3.0 HEC -RAS Plan: exist2 River: Whites Creek Reach: Whites Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. Val Chnl Flow Area Top Width (cfs) (ft) (ft) (ft) (ft/s) (sq ft) (ft) Whites 1593 10 -yr 203.40 297.50 306.58 0.56 360.58 68.18 Whites 1593 100 -yr 298.90 297.50 307.26 0.73 408 .04 71.11 Whites 1493 10 -yr 203.40 297.50 306.57 0.56 360.42 68.17 Whites 1493 100 -yr 298.90 297.50 307.25 0.73 407.25 71.06 Whites 1393 10 -yr 203.40 296.00 306.57 0.53 384.33 71.93 Whites 1393 100 -yr 298.90 296.00 307.24 0.70 435.10 81.03 Whites 1314 10 -yr 203.40 296.10 306.57 0.33 616.74 100.40 Whites 1314 100 -yr 298.90 296.10 307.23 0.44 686.18 109.24 Whites 1203 10 -yr 203.40 295.50 306.57 0.37 586.61 105.38 Whites 1203 100 -yr 298.90 295.50 307 .23 0.50 662.87 125.41 Whites 1179 10 -yr 203.40 295.30 306.57 0.31 702.88 123.25 Whites 1179 100 -yr 298.90 295.30 307.23 0.41 791.02 143.47 Whites 1070 10 -yr 203.40 291.00 306.57 0.26 993.34 189.64 Whites 1070 100 -yr 298.90 2 91.00 307.23 0.36 1126.85 215.41 i Whites 1039 10 -yr 203.401 290.70 306.57 0.24 1056.39 19 0.58 Whites 1039 100 -yr 298.90 290.70 307.23 0.33 1190.16 215.43 Whites 1010 10 -yr 203.40 290.20 306.57 0 .16 1547.43 225.45 Whites 1010 100 -yr 298.90 290.20 307.23 0.22 1701.74 241 .52 Whites 1000 10 -yr 203.40 289.90 306.57 0.15 1647.14 221.51 Whites 1000 100 -yr 298.90 289.90 307.23 0.21 1797.42 233.27 Whites 999 10 -yr 203.40 289.90 306.57 293.59 0.15 1564.43 173.80 Whites 999 100 -yr 29 8.90 289.90 307.23 293.99 0.21 _ 1679.29 173.80 Whites 804.5 Culvert Whites 804 10 -yr 203.40 289.03 294.46 1.92 106.15 53.65 Whites 804 100 -yr 298.90 289.03 295.20 1.99 149.95 63.85 Whites 700 10 -yr 207.10 288.50 293.93 291.84 2.36 87.60 34.30 Whites 700 100 -yr 304.30 288.50 294.70 292.33 2.63 115.55 38.41 Exhibit C -1 Culvert Data for FM 2818 Confluence HEC -RAS 3.0 Plan: exist2 Whites Creek Whites RS: 1593 Profile: 100 -vr E.G. Elev (ft) 307.27 Element Left OB Channel Right OB Vel Head (ft) W.S. Elev (ft) 0.01 307.26 Wt. n -Val. Reach Len. (ft) 78.20 0.080 100.0 80.30 Crit W.S. (ft) Flow Area (sq ft) E.G. Slope (ft/ft) 0.000160 Area (sq ft) _ _ __ 408.04 408.04 Q Total (cfs) 298.90 Flow (cfs) 298.90 _ Top Width (ft) 71.11 Top Width (ft) 71.11 Vel Total (ft/s) 0.73 Avg. Vel. (ft/s) 0.73 Max Chl Dpth (ft) 9.76 Hydr. Depth (ft) 5.74 Conv. Total (cfs) 23602.1 Conv. (cfs) 23602.1 Length Wtd. (ft) 100.00 Wetted Per. (ft) 74.25 Min Ch El (ft) 297.50 Shear (lb /sq ft) 0.06 Alpha 1.00 Stream Power (lb /ft s) 0.04 Frctn Loss (ft) 0.02 Cum Volume (acre -ft) 1.71 11.82 0.57 C & E Loss (ft) 0.00 Cum SA (acres) 0.49 1.56 0.28 Exhibit C -2 Water Surface Profile Plot HEC -RAS 3.0 Exhibit C -3