RECOR Preliminary Stormwater Management Report - 20220198

Site Catchment Areas for DRAINS Modelling
Project number:    20220198                                         Calculations:                       B. Parry
Street Address:    3 Delorme St
Locality:          Noosa Heads, NSC                                 Date:                               19/08/2022


Existing Site
                                            Existing Site           Directly connected (m²)             Indirectly connected (m²)
3 Delorme St       Roof                                     224.5                               224.5                                  -
                   Impervious Ground                         19.5                                 -                                   19.5
                   Driveway                                  38.2                                38.2                                  -

                   Total Imp                                282.2                               262.7                                 19.5
                   Total Per                                550.2                                 -                                  550.2
                   Site Area                                832.4                               262.7                                 19.5

% impervious                                                        Effective DCIA = 75% DCIA           ICIA +25% ineffective DCIA
                                                                                                197.0                                 85.2
                   Impervious                               33.9%                               23.7%                                10.2%
                   Pervious                                 66.1%



Proposed Site



                                            Proposed                Directly connected (m²)             Indirectly connected (m²)
3 Delorme St       Roof                                     406.8                               406.8                                  -
                   Impervious Ground                         97.4                                 -                                   97.4
                   Driveway                                 100.0                               100.0

                   Total Imp                                604.2                               506.8                                 97.4
                   Total Per                                228.2                                 -                                  228.2
                   Site Area                                832.4                               506.8                                325.6

% impervious                                                        Effective DCIA = 75% DCIA           ICIA +25% ineffective DCIA
                                                                                                380.1                                224.1
                   Impervious                               72.6%                               45.7%                                26.9%
                   Pervious                                 27.4%