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Stormwater Management Plan
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23 Bottlebrush Ave, Noosa Head Rational Method Calculations File: 10256 Date: 16/05/2025 Stormwater Drainage Runoff - Calculations Unit Value Reference / Comments Existing condition Average Recurrence Interval (ARI) Years 2 5 10 20 50 100 Area ha 0.0505 0.0505 0.0505 0.0505 0.0505 0.0505 fi 0.700 0.700 0.700 0.700 0.700 0.700 C10 0.84 0.84 0.84 0.84 0.84 0.840 QUDM Table 4.5.3 Fy 0.85 0.95 1 1.05 1.15 1.2 QUDM Table 4.5.2 Cy = Fy * C10 0.714 0.798 0.84 0.882 0.966 1 Time of concentration (tc) minutes 9 9 9 9 9 9 Rainfall Intensity (I) mm / hr 133 164 188 213 245 269.0 3 Qpost (Peak Runoff) = (C*I*A)/360 m /s 0.013 0.018 0.022 0.026 0.033 0.038 Stormwater Drainage Runoff - Calculations Unit Value Reference / Comments Developed Condition Average Recurrence Interval (ARI) Years 2 5 10 20 50 100 Area ha 0.0505 0.0505 0.0505 0.0505 0.0505 0.0505 fi 0.850 0.850 0.850 0.850 0.850 0.850 C10 0.87 0.87 0.87 0.87 0.87 0.870 QUDM Table 4.5.3 Fy 0.85 0.95 1 1.05 1.15 1.2 QUDM Table 4.5.2 Cy = Fy * C10 0.7395 0.8265 0.87 0.9135 1 1 Time of concentration (tc) minutes 5 5 5 5 5 5 Rainfall Intensity (I) mm / hr 157 196 226 258 300 322.0 Qpost (Peak Runoff) = (C*I*A)/360 m3 / s 0.016 0.023 0.028 0.033 0.042 0.045
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