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Table 2 — Time of Concentration Calculations <br />SCS Lao Formula <br />t = 0.00526 L °• /CN- 9)o. <br />Drainage Basin 1A <br />(CN) Curve Number <br />(L) Flow Length (ft) <br />Highest Elevation (ft) <br />Lowest Elevation (ft) <br />(S) Slope (ft/ft) <br />(tc) Time of Concentration (min) <br />(tc) Time of Concentration (hour) <br />Drainage Basin 2A <br />80 (CN) Curve Number <br />4409 (L) Flow Length (ft) <br />6900 Highest Elevation (ft) <br />5680 Lowest Elevation (ft) <br />0.28 (S) Slope (ft/ft) <br />52.4 (tc) Time of Concentration (min) <br />0.87 (tc) Time of Concentration (hour) <br />Drainage Basin 3A <br />89 (CN) Curve Number <br />5073 (L) Flow Length (ft) <br />7090 Highest Elevation (ft) <br />5630 Lowest Elevation (ft) <br />0.29 (S) Slope ( ft/ft) <br />52.9 (tc) Time of Concentration (min) <br />89 <br />3876 <br />6910 <br />5700 <br />0.31 <br />41.0 <br />0.88 (tc) Time of Concentration (hour) 0.68 <br />