Stormwater Management Report · MCU22/0087.01

Site Catchment Areas for DRAINS Modelling
Project number:    20220051                                         Calculations:                        M. Poynter
Street Address:    37 Bottlebrush Ave
Locality:          Noosa Heads, NSC                                 Date:                                14/10/2024


Existing Site
                                            Existing Site           Directly connected (m²)              Indirectly connected (m²)
37 Bottlebrush Ave Roof                                     199.8                               199.8                                   -
                   Impervious Ground                         64.7                                 -                                    64.7
                   Driveway                                  47.9                                47.9                                   -
                   Total Imp                                312.4
                   Total Per                                179.1
                   Site Area                                491.5                               247.7                                  64.7

% impervious                                                        Effective DCIA = 75% DCIA            ICIA +25% ineffective DCIA
                                                                                                185.78                                126.59
                   Impervious                               63.6%                                37.8%                                 25.8%
                   Pervious                                 36.4%



Proposed Site                                               22.97



                                            Proposed                Directly connected (m²)              Indirectly connected (m²)
37 Bottlebrush Ave Roof                                     222.8                               222.8                                   -
                   Impervious Ground                         96.1                                63.3                                  32.8
                   Driveway                                  26.1                                26.1                                   -
                   Total Imp                                344.9
                   Total Per                                146.5
                   Site Area                                491.5                               312.1                                  32.8

% impervious                                                        Effective DCIA = 75% DCIA            ICIA +25% ineffective DCIA
                                                                                                234.1                                 110.8
                   Impervious                               70.2%                               47.6%                                 22.6%
                   Pervious                                 29.8%