16-001014-02A (Ultimate SCMMP)

South Bioretention Basin
Critical Section
CROSS SECTION DETAILS                                                         10% AEP                           1% AEP
     POINT       CH                    Z            n              wA           wP       n x wA        wA         wP        n x wA




                   1         ‐11.2     101.2     0.060
                   2         ‐11.2       101     0.060
                   3           ‐10     100.7     0.060             0.11           0.95    0.01        0.14          1.11     0.01
                   4            10     100.7     0.060             4.62          20.00    0.28        5.37          20.00    0.32
                   5            12     101.2     0.060             0.11           0.95    0.01        0.14          1.11     0.01




                                                                  wA       wP     n x wA     wA       wP     n x wA
                                               TOTAL           4.833444 21.90487 0.290007 5.658369 22.21411 0.339502
                            S
                          0.005                                    R               n       Q            R             n       Q
                                                               0.220656          0.060    2.08       0.25472        0.060    2.68
                                                      Flow                        2.08                               2.68

                                                     WSL                       100.931                          100.9685

                       Calculated by Manning's Equation                           2.08                              2.68
                                               Vel (m/s)                          0.43                              0.47

                                                             Basin Section
                                                               101.4


                                                               101.2


                                                                   101
  Height (m AHD)




                                                               100.8


                                                               100.6


                                                               100.4


                                                               100.2


                                                                   100
      -15                   -10                -5                         0               5                    10              15
                                                                   Width (m)

                                               Existing Sur face              10 % AEP     1% A EP



As indicated in the results above, velocity is below 0.5m/s during both the major and minor storm
events. The potential for scour or damage to vegetation is therefore low and below requirements
specified in WSUD Technical Design Guidelines (2006)