Swmp · 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:                                 24/06/2022


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                                   282.9                                 282.9                                      0
                   Impervious Ground                     113.61                                 47.14                                  66.47
                   Driveway                               53.21                                     0                                  53.21
                   Total Imp                             449.72
                   Total Per                             148.28
                   Site Area                                598

% impervious                                                      Effective DCIA = 75% DCIA             ICIA +25% ineffective DCIA
                                                                                               247.53                                 202.19
                                                         75.2%                                  41.4%                                  33.8%
                                                         24.8%