Stormwater Management Plan · MCU22/0058

Site Catchment Areas for DRAINS Modelling
Project number:    20220078                                        Calculations:                         B. Parry
Street Address:    6 Wyandra Street
Locality:          Noosa Heads, Noosa Shire Council                Date:                                 29/03/2022


Existing Site
                                          Existing Site            Directly connected (m²)               Indirectly connected (m²)
Wyandra St         Roof                                    172.5                                 172.5                                       0
                   Impervious Ground                       67.38                                     0                                   67.38
                   Driveway                                64.47                                     0                                   64.47
                   Total Imp                              304.35
                   Total Per                              293.65
                   Site Area                                 598

% impervious                                                       Effective DCIA = 75% DCIA             ICIA +25% ineffective DCIA
                                                                                               129.375                                 174.975
                   Impervious                             50.9%                                  21.6%                                   29.3%
                   Pervious                               49.1%




Proposed Site
                                          Proposed                 Directly connected (m²)               Indirectly connected (m²)
Wyandra St         Roof                                   263.78                                263.78                                       0
                   Impervious Ground                      164.01                                 79.05                                   84.96
                   Driveway                                58.78                                 38.14                                   20.64
                   Total Imp                              486.57
                   Total Per                              111.43
                   Site Area                                 598

% impervious                                                    Effective DCIA = 75% DCIA        ICIA +25% ineffective DCIA
                                                                                        285.7275                                      200.8425
                                                          81.4%                            47.8%                                         33.6%
                                                          18.6%