20210153 - Maple Street SWMP

DRAINS Modelling Results
Project number:     20210153                                                          Calculations:               B. Parry
Street Address:     45 Maple Street, Cooroy
Locality:           Cooroy, Noosa Shire Council                                       Date:                       9/03/2022




                                              Maple Street
       A.E.P                                                                                  Qchange (%)
                        Qexisting (m³/s)     Qproposed (m³/s)     Qchange (m³/s)
                 1EY                 0.045                0.073              0.028                          62%
                 50%                 0.054                0.085              0.031                          57%
               0.2 EY                0.103                0.128              0.025                          24%
                 10%                 0.129                0.149               0.02                          16%
                  5%                 0.159                0.174              0.015                           9%
                  2%                 0.196                0.199              0.003                           2%
                  1%                 0.215                0.223              0.008                           4%




                                              Maple Street
       A.E.P                                                                                  Qchange (%)
                        Qexisting (m³/s)     Qmitigated (m³/s)    Qchange (m³/s)                                              Prelim Attenuation Sizing
                 1EY                 0.045                0.038              -0.007                     -16%                  3.78m diameter        (2 tanks 25kL)
                 50%                 0.054                0.045              -0.009                     -17%                  Surface Area          22.44m²
               0.2 EY                0.103                 0.09              -0.013                     -13%                  2.42 inlet height
                 10%                 0.129                0.116              -0.013                     -10%                  2.78 total height
                  5%                 0.159                 0.14              -0.019                     -12%                  55mm low flow outlet at base
                  2%                 0.196                0.167              -0.029                     -15%                  150mm high flow outlet at 1.8m
                  1%                 0.215                0.184              -0.031                     -14%