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Site Catchment Areas for DRAINS Modelling
Project number:    20220130                                       Calculations:                         B. Parry
Street Address:    22 Delorme St
Locality:          Noosa Heads, Noosa Shire Council               Date:                                 13/05/2022


Existing Site
                                         Existing Site            Directly connected (m²)               Indirectly connected (m²)
Delorme St         Roof                                   140.5                                 140.5
                   Impervious Ground                         87                                     0                                    87
                   Driveway                                19.3                                     0                                   19.3
                   Total Imp                              246.8
                   Total Per                              281.7
                   Site Area                              528.5

% impervious                                                      Effective DCIA = 75% DCIA             ICIA +25% ineffective DCIA
                                                                                              105.375                                141.425
                   Impervious                            46.7%                                  19.9%                                  26.8%
                   Pervious                              53.3%




Proposed Site
                                         Proposed                 Directly connected (m²)               Indirectly connected (m²)
Delorme St         Roof                                  201.57                                201.57                                      0
                   Impervious Ground                      105.2                                     0                                  105.2
                   Driveway                                49.9                                     0                                   49.9
                   Total Imp                             356.67
                   Total Per                             171.83
                   Site Area                              528.5

% impervious                                                      Effective DCIA = 75% DCIA             ICIA +25% ineffective DCIA
                                                                                               151.2                                  205.5
                                                         67.5%                                 28.6%                                  38.9%
                                                         32.5%