Stormwater management plan 20220156 9 Kauri St SWMP

DRAINS Modelling Results
Project number:     20220156                                                           Calculations:               B. Parry
Street Address:     9 Kauri Street
Locality:           Cooroy, Noosa Shire Council                                        Date:                       27/06/2022




                                              Kauri Street
       A.E.P                                                                                   Qchange (%)
                        Qexisting (m³/s)     Qproposed (m³/s)     Qchange (m³/s)
                 1EY                 0.021                0.035               0.014                          67%
                50%                  0.026                0.043               0.017                          65%
               0.2 EY                0.044                0.072               0.028                          64%
                10%                  0.060                0.086               0.026                          43%
                  5%                 0.075                0.101               0.026                          35%
                  2%                 0.094                0.126               0.032                          34%
                  1%                 0.106                0.147               0.041                          39%




                                              Kauri Street
       A.E.P                                                                                   Qchange (%)
                        Qexisting (m³/s)     Qmitigated (m³/s)    Qchange (m³/s)                                                OSD Tank Sizing Summary
                 1EY                 0.021                0.021                    0                         0%                 Below ground attenuation chamber
                50%                  0.026                0.024              -0.002                          -8%                Total Volume                           45.6 m³
               0.2 EY                0.044                0.034               -0.01                      -23%                   140mm low flow outlet at base
                10%                  0.060                0.050               -0.01                      -17%                   300mm high flow outlet obvert at top of tank
                  5%                 0.075                0.070              -0.005                          -7%
                  2%                 0.094                0.093              -0.001                          -1%
                  1%                 0.106                0.103              -0.003                          -3%