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Response to Information Request 20220004 -Tunba Court
Attached to the e-mail Response to Information Request OPW21/0355 - 36 Tunba Court, Cooroy Mountain.
Rational Method Calculations Project number: 20220004 Calculations: B. Parry Street Address: 36 Tunba Ct Locality: Cooroy Mountain, Noosa Shire Council Date: 8/02/2022 Pre-post earthworks run-off conditions Pre-development Earthworks Pad 2 Impervious Surface 0 m 2 Permeable Area 1600 m Total Site Area: 1600 m2 Time of Concentration Time of Concentration Sheet flow (Friends Eqn.) Length 47 m Standard Inlet time 5 mins Horton's n 0.04 Densely grassed Fall over distance 14.5 m Pipe Flow Slope 30.9 % Flow distance 66.00 m Time 7.8 mins Slope 1 % Pipe Diameter 0.45 m Tc 8.0 mins Flow velocity (Mannings eqn.) 1.79 m/s Time 0.61 mins Time 6.0 mins Rational Method Calculations Area (Ha.) 0.160 Ha. Area (Ha.) 0.160 Ha. fi 0.000 fi 0.000 1 1 I10 70.2 mm/hr I10 70.2 mm/hr C10 0.70 C10 0.70 AEP Fy Cy Iy (2100) Qy (m3/s) AEP Fy Cy Iy (2100) Qy (m3/s) 63.2% AEP 0.8 0.560 132.82 0.0331 63.2% AEP 0.8 0.560 139.20 0.0346 50% AEP 0.85 0.595 150.72 0.0399 50% AEP 0.85 0.595 157.20 0.0416 20% AEP 0.95 0.665 203.76 0.0602 20% AEP 0.95 0.665 212.40 0.0628 10% AEP 1 0.700 237.84 0.0740 10% AEP 1 0.700 249.60 0.0777 5% AEP 1.05 0.735 272.64 0.0891 5% AEP 1.05 0.735 284.40 0.0929 2% AEP 1.15 0.805 315.60 0.1129 2% AEP 1.15 0.805 328.80 0.1176 1% AEP 1.2 0.840 348.48 0.1301 1% AEP 1.2 0.840 362.40 0.1353 Comparison Earthworks Vs Pre-development Qy (m3/s) - Pre-developed Qy (m3/s) - Earthworks Change (L/s) % Change 0.0331 0.0346 1.5889 4.81 0.0399 0.0416 1.7136 4.30 0.0602 0.0628 2.5536 4.24 0.0740 0.0777 3.6587 4.94 0.0891 0.0929 3.8416 4.31 0.1129 0.1176 4.7227 4.18 0.1301 0.1353 5.1968 3.99
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