RFI - SWMP.pdf

        Drains catchment B      0.038      0.041       0.047     0.053       0.058       0.081     0.104
         Post Development
            (Mitigated)



The PC DRAINS Hydraulic Modelling has demonstrated the proposed mitigated peak discharge flow
rates will not exceed the total pre development flows for all design storms. Refer Appendix D for the
drains results.



6.3.5     Total Post Development Mitigated Discharge



The post development rational method results displayed in Table 6.3 for catchment A has been added
to the mitigated catchment B results from PC DRAINS displayed in Table 6.5. Table 6.6 summarises
the total post development site discharge.



                           Table 6.6 – Total Post Development Mitigated Peak Discharge

            Catchment             Q1         Q2         Q5        Q10         Q20         Q50      Q100
                                (m3/s)     (m3/s)      (m3/s)       3        (m3/s)      (m3/s)   (m3/s)
                                                                 (m /s)

         Rational Method        0.028      0.034       0.051     0.063       0.076       0.095     0.105
         Catchment A Post
           Development

        Drains Catchment B      0.031      0.038       0.044     0.052       0.057       0.061     0.109
         Post Development
            (Mitigated)

        Total Site Discharge    0.059      0.072       0.095     0.115       0.133       0.156     0.217




SCG Consulting Engineers                     Page 21                                     SCG Ref: 31131(SWMP)