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Rational Method Calculations Project number: 20210008 Calculations: B. Parry Street Address 9 Bottlebrush Ave Locality: Noosa Heads, Noosa Shire Council Date: 12/07/2021 Lot 147 RP 88934 Site Area Composition Existing Site Roof Area: 188.407 m2 Developed Site Roof Area: 161.348 m2 Existing Site Paved Area: 135.9653 m2 Developed Site Paved Area: 196.082 m2 Existing Site Total (Impermeable): 324.3723 m2 Developed Site Total (Impermeable): 357.43 m2 Existing Site Total (Permeable): 181.2037 m2 Developed Site Total (Permeable): 148.146 m2 Total Site Area: 505.576 m2 Increase Impermeable Area: 33.058 m2 0.003 Ha. Time of Concentration Existing Site Proposed Site tc 5.0 mins tc 5.00 mins Rational Method - Peak Flow Calculation Existing Site Proposed Site Area (Ha.) 0.051 Ha. Area 0.051 Ha. fi 0.642 Fi 0.707 1 1 I10 74.9 mm/hr I10 74.9 mm/hr C10 0.83 C10 0.84 A.E.P Fy Cy Iy Qy (m3/s) A.E.P Fy Cy Iy Qy (m3/s) 4 EY 79.00 0.0058 3 Month (4 EY) 79.00 0.0059 1 EY 0.8 0.663 125.00 0.0116 1 (1 EY) 0.8 0.673 125.00 0.0118 0.5 EY 0.85 0.704 157.00 0.0155 2 (0.5 EY) 0.85 0.715 157.00 0.0158 20% AEP 0.95 0.787 192.00 0.0212 5 (0.2 EY) 0.95 0.799 192.00 0.0216 10% AEP 1 0.828 226.00 0.0263 10 (10% AEP) 1 0.841 226.00 0.0267 5% AEP 1.05 0.870 258.00 0.0315 20 (5% AEP) 1.05 0.883 258.00 0.0320 2% AEP 1.15 0.953 300.00 0.0401 50 (2% AEP) 1.15 0.968 300.00 0.0408 1% AEP 1.2 0.994 332.00 0.0463 100 (1 in 100) 1.2 1.010 332.00 0.0471 Pre / Post Comparison AEP Qincrease (m3/s) Estimated storage (m3) 4 EY 0.0001 0.0367 1 EY 0.0002 0.0735 0.5 EY 0.0002 0.0980 20% AEP 0.0003 0.1340 10% AEP 0.0004 0.1660 5% AEP 0.0005 0.1990 2% AEP 0.0006 0.2534 1% AEP 0.0007 0.2927
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