Response to Further advice - 20220156 Kauri St SWMP · MCU22/0144

Site Catchment Areas for DRAINS Modelling
Project number:    20220156                                        Calculations:                        B. Parry
Street Address:    9 Kauri Street
Locality:          Cooroy, Noosa Shire Council                     Date:                                27/06/2022


Existing Site
                                          Existing Site            Directly connected (m²)              Indirectly connected (m²)
Kauri St           Roof                                    200.5                                   0                                 200.5
                   Impervious Ground                          80                                   0                                    80
                   Driveway                                    0                                   0                                     0
                   Total Imp                               280.5                                   0                                 280.5
                   Total Per                              1857.5
                   Site Area                                2138

% impervious                                                       Effective DCIA = 75% DCIA            ICIA +25% ineffective DCIA
                                                                                                   0                                 280.5
                   Impervious                             13.1%                                 0.0%                                 13.1%
                   Pervious                               86.9%




Proposed Site
                                          Proposed                 Directly connected (m²)              Indirectly connected (m²)
Kauri St           Roof                                   1002.2                               1002.2                                   0
                   Impervious Ground                        24.7                                 24.7                                   0
                   Driveway                                510.8                                510.8                                   0
                   Total Imp                              1537.7                               1537.7                                   0
                   Total Per                               600.3
                   Site Area                                2138

% impervious                                                       Effective DCIA = 75% DCIA            ICIA +25% ineffective DCIA
                                                                                               1153.3                                384.4
                                                          71.9%                                 53.9%                                18.0%
                                                          28.1%