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Attachment 2 - Stormwater Management Plan · 131998.981126.5
Plans and drawings: the text below has words only, no drawings.
POST DEVELOPMENT 2 tan noosa 100-Year Duration=6 min, Inten=295.9 mm/hr, Cf=1.20
Prepared by HP Inc. Printed 12/09/2022
HydroCAD® 10.00-26 s/n 05328 © 2020 HydroCAD Software Solutions LLC Page 6
Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points
Runoff by Rational method, Rise/Fall=1.0/1.7 xTc
Reach routing by Muskingum-Cunge method - Pond routing by Stor-Ind method
Subcatchment 2S: New Shed Runoff Area=450.0 m² 100.00% Impervious Runoff Depth=40 mm
Tc=6.0 min Frequency Adjusted C=1.00 Runoff=0.03704 m³/s 0.018 Ml
Subcatchment 4S: New Concrete Runoff Area=120.0 m² 100.00% Impervious Runoff Depth=40 mm
Tc=6.0 min Frequency Adjusted C=1.00 Runoff=0.00988 m³/s 0.005 Ml
Subcatchment 7S: New Road Extension Runoff Area=40.0 m² 0.00% Impervious Runoff Depth=40 mm
Tc=6.0 min Frequency Adjusted C=1.00 Runoff=0.00329 m³/s 0.002 Ml
Reach 4R: DN450 SW Pipe Inflow=0.02615 m³/s 0.020 Ml
Outflow=0.02615 m³/s 0.020 Ml
Pond 1P: 2 x 5,000L Tanks - West Peak Elev=16.820 m Storage=11.8 m³ Inflow=0.03100 m³/s 0.017 Ml
Outflow=0.01944 m³/s 0.013 Ml
Link 3L: (new Link) below 0.03100 m³/s Inflow=0.03704 m³/s 0.018 Ml
Primary=0.03100 m³/s 0.017 Ml Secondary=0.00604 m³/s 0.000 Ml
Total Runoff Area = 0.0610 ha Runoff Volume = 0.024 Ml Average Runoff Depth = 40 mm
6.56% Pervious = 0.0040 ha 93.44% Impervious = 0.0570 ha
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