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20210153 - Maple Street SWMP

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Site Catchment Areas for DRAINS Modelling
Project number:    20210153                                                                                                                              Calculations:   B. Parry
Street Address:    45 Maple Street, Cooroy
Locality:          Cooroy, Noosa Shire Council                                                                                                           Date:           23/03/2022


Existing Site
                                          Existing Site               Directly connected (m²)                Indirectly connected (m²)
Myall St           Roof                                      282.53                                 282.53                                          0
                   Impervious Ground                          181.1                                  49.75                                     131.35
                   Driveway                                   34.05                                      0                                      34.05
                   Total Imp                                 497.68
                   Total Per                                1613.79
                   Site Area                                2111.47

Maple St           Roof                                     245.067                                     0                                     245.067
                   Impervious Ground                           53.8                                     0                                        53.8
                   Driveway                                       0
                   Total Imp                                298.867                                     0
                   Total Per                                708.213
                   Site Area                                1007.08

All                Site                                     3118.55
                   Pervious                                2322.003
                   Impervious                               796.547                                 332.28                                    464.267

% impervious                                                          Effective DCIA = 75% DCIA              ICIA +25% ineffective DCIA
                                                                                                  249.21                                       547.337
                                                     0.255422231                            0.079912139                                   0.175510093
                                                     0.744577769

Proposed Site
                                          Proposed Site               Directly connected (m²)                Indirectly connected (m²)                                   Proposed Site (EXCL ROOF TO TANK)   Directly connected (m²)           Indirectly connected (m²)
Myall St           Roof                                    1220.448                               1220.448                                          0                                                                                      0                                         0
                   Impervious Ground                         141.32                                      0                                     141.32                                               141.32                                 0                                    141.32
                   Driveway                                   533.4                                  533.4                                          0                                                533.4                             533.4                                         0
                   Total Imp                               1895.168                                                                                                                                 674.72
                   Total Per                                602.832                                                                                                                                602.832
                   Site Area                                   2498                                                                                                                               1277.552

Maple St           Roof                                    268.5122                               235.8352                                     32.677                                             268.5122                        235.8352                                      32.677
                   Impervious Ground                           3.54                                      0                                       3.54                                                 3.54                               0                                        3.54
                   Driveway
                   Total Imp                               272.0522                                                                                                                               272.0522
                   Total Per                               348.9478                                                                                                                               348.9478
                   Site Area                                    621                                                                                                                                    621

All                Site                                        3119                                                                                                                               1898.552
                   Pervious                                951.7798                                                                                                                               951.7798
                   Impervious                             2167.2202                             1989.6832                                     177.537                                             946.7722                        769.2352                                     177.537

% impervious                                                     Effective DCIA = 75% DCIA          ICIA +25% ineffective DCIA                                                                             Effective DCIA = 75% DCIA      ICIA +25% ineffective DCIA
                                                                                          1492.2624                                          674.9578                                                                            576.9264                                     369.8458
                                                     0.694844566                       0.478442578                                        0.216401988                                          0.498681205                     0.30387706                                  0.194804145
                                                     0.305155434                                                                                                                               0.501318795

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