RFI - 20210153 Maple St SWMP

DRAINS Modelling Results
Project number:     20210153                                                           Calculations:               B. Parry
Street Address:     45 Maple Street, Cooroy
Locality:           Cooroy, Noosa Shire Council                                        Date:                       4/05/2023




                                              Maple Street
       A.E.P                                                                                   Qchange (%)
                        Qexisting (m³/s)     Qproposed (m³/s)      Qchange (m³/s)
                 1EY                 0.058                0.087                0.029                         50%
                50%                  0.068                   0.1               0.032                         47%
               0.2 EY                0.125                0.151                0.026                         21%
                10%                  0.156                0.177                0.021                         13%
                  5%                 0.192                0.208                0.016                         8%
                  2%                 0.235                0.241                0.006                         3%
                  1%                 0.262                  0.27               0.008                         3%




                                              Maple Street
       A.E.P                                                                                   Qchange (%)
                        Qexisting (m³/s)     Qmitigated (m³/s)     Qchange (m³/s)                                              Prelim Attenuation Sizing
                 1EY                 0.058                0.047               -0.011                     -19%                  3.78m diameter        (2 tanks 25kL)
                50%                  0.068                0.057               -0.011                     -16%                  Surface Area          22.44m²
               0.2 EY                0.125                0.102               -0.023                     -18%                  2.42 inlet height
                10%                  0.156                0.129               -0.027                     -17%                  2.78 total height
                  5%                 0.192                  0.16              -0.032                     -17%                  55mm low flow outlet at base
                  2%                 0.235                0.197               -0.038                     -16%                  150mm high flow outlet at 1.8m
                  1%                 0.262                0.218               -0.044                     -17%