Attachment 2 - Stormwater Management Plan · 131998.981126.5

PRE DEVELOPMENT                 noosa 100-Year Duration=6 min, Inten=295.9 mm/hr, Cf=1.20
Prepared by HP Inc.                                                            Printed 31/08/2022
HydroCAD® 10.00-26 s/n 05328 © 2020 HydroCAD Software Solutions LLC                        Page 5

                        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 Stor-Ind method - Pond routing by Stor-Ind method

Subcatchment 1S: Existing Equivalent Runoff Area=509.0 m² 0.00% Impervious Runoff Depth=34 mm
                               Tc=6.0 min Frequency Adjusted C=0.84 Runoff=0.03519 m³/s 0.017 Ml

Subcatchment 2S: Existing shed and Runoff Area=101.0 m² 100.00% Impervious Runoff Depth=40 mm
                                                 Tc=6.0 min C=1.00 Runoff=0.00831 m³/s 0.004 Ml

Reach 4R: DN450 SW Pipe                                                Inflow=0.04351 m³/s 0.021 Ml
                                                                      Outflow=0.04351 m³/s 0.021 Ml

        Total Runoff Area = 0.0610 ha Runoff Volume = 0.021 Ml Average Runoff Depth = 35 mm
                                    83.44% Pervious = 0.0509 ha 16.56% Impervious = 0.0101 ha