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Appendix 9 Lag Time Calculations
Appendix 9 Lag Time Calculations Proposed Hydrology Model HEC-1 I Table I Area Characteristics Sub-1 Sub-Area Area Flow Path Upper Lower Watershed Curve s T(Lag) Elev. Elev. Slope Number (sq mi) (ft) (%) (hrs) NF.1 3,400 333 306 0.79 89.8 1.14 0.672 NF.2 5,650 329 290 0.69 87.7 1.40 1.174 NF.3 5,750 314 274 0.70 94 0.64 0.908 NF.4 7,500 320 261 0.79 91 .9 0.88 1.163 SF.1 4,600 363 287 1.65 88.05 1.36 0.635 SF.2 5,000 345 279 1.32 87.75 1.40 0.769 SF.3 5,900 307 272 0.59 87.35 1.45 1.329 SF.4 5,950 301 261 0.67 91.9 0.88 1.045 LM.1 10,625 307 248 0.56 83.1 2.03 2.555 LM.2 8,500 292 227 0.76 83.8 1.93 1.779 LM .3 10,750 301 218 0.77 87 1.49 1.907 LM.4 7,250 250 211 0.54 75 3.33 2.454 LM.5 13,750 298 198 0.73 75 3.33 3.522 AL.1 11,000 330 238 0.84 84 1.90 2.077 AL.2 8,750 295 225 0.80 75 3.33 2.339 AL.3 7,800 291 208 1.06 75 3.33 1.850 AC1.1 10,750 319 225 0.87 90.5 1.05 1.562