RFI - 20220156 Kauri St SWMP Rev B

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                                   1008.3                               1008.3                                   0
                   Impervious Ground                           0                                    0                                   0
                   Driveway                                562.6                                562.6                                   0
                   Total Imp                              1570.9                               1570.9                                   0
                   Total Per                               567.1
                   Site Area                                2138

% impervious                                                       Effective DCIA = 75% DCIA            ICIA +25% ineffective DCIA
                                                                                               1178.2                                392.7
                                                          73.5%                                 55.1%                                18.4%
                                                          26.5%