Attachment 2 - Stormwater Management Plan · 131998.981126.5

POST DEVELOPMENT 2 tanks                     noosa 2-Year Duration=6 min, Inten=153.3 mm/hr
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=20 mm
                                                 Tc=6.0 min C=0.98 Runoff=0.01880 m³/s 0.009 Ml

Subcatchment 4S: New Concrete       Runoff Area=120.0 m² 100.00% Impervious Runoff Depth=20 mm
                                                 Tc=6.0 min C=0.98 Runoff=0.00501 m³/s 0.002 Ml

Subcatchment 7S: New Road Extension Runoff Area=40.0 m² 0.00% Impervious Runoff Depth=19 mm
                                                 Tc=6.0 min C=0.90 Runoff=0.00153 m³/s 0.001 Ml

Reach 4R: DN450 SW Pipe                                                Inflow=0.00836 m³/s 0.008 Ml
                                                                      Outflow=0.00836 m³/s 0.008 Ml

Pond 1P: 2 x 5,000L Tanks - West   Peak Elev=15.904 m Storage=7.1 m³ Inflow=0.01880 m³/s 0.009 Ml
                                                                    Outflow=0.00497 m³/s 0.005 Ml

Link 3L: (new Link)                               below 0.03100 m³/s Inflow=0.01880 m³/s 0.009 Ml
                                   Primary=0.01880 m³/s 0.009 Ml Secondary=0.00000 m³/s 0.000 Ml

        Total Runoff Area = 0.0610 ha Runoff Volume = 0.012 Ml Average Runoff Depth = 20 mm
                                    6.56% Pervious = 0.0040 ha 93.44% Impervious = 0.0570 ha