16-001014-02A (Ultimate SCMMP)

                      WQCP DESIGN CALCULATIONS SUMMARY- BASED ON WBD WSUD TECHNICAL DESIGN GUIDELINES
                                                                                                                                               Calculation Summary
                                        Calculation Task                                                   Outcome                                       Comments                                          Check
    Catchment Characteristics
                                                                                       Catchment area        13.9     ha          Including Existing External Catchments
                                                 Catchment land use (i.e residential, commercial etc.)      varying               Refer to latest issue of the SWMP Report No. 16-001014-01.

                                                                                                                                  Combined WQCP & detention basin is proposed. Energy Dissipaters and
                                                      Storm event entering inlet pond (minor or major)      Major
                                                                                                                                  velocity checks undertaken to ensure protection of WQCP.

    Conceptual Design
                                                                              Macrophyte zone area           1,940    m2          Area Required determined through MUSIC modelling
                                                             Permanent pool level of macrophye zone          99.2     m AHD
                                                                Extended detention depth (0.25-0.5m)          0.4     m
                                                                               Notional detention time        55      hrs
1   Confirm Treatment Performance of Conceptual Design
                                                                  Total suspended solids (Figure 6-2)        80%      % removal   Refer to latest issue of the SWMP Report No. 16-001014-01.
                                                                        Total phosphorus (Figure 6-3)        69%      % removal   Refer to latest issue of the SWMP Report No. 16-001014-01.
                                                                           Total nitrogen (Figure 6-4)       46%      % removal   Refer to latest issue of the SWMP Report No. 16-001014-01.
2   Determine Design Flows
                                                                            Modelling Software Used        XP-RAFTS   Type        Refer to latest issue of the SWMP Report No. 16-001014-01.
                                                                Verified with Rational Method Check?         Yes      Y/N         Refer to latest issue of the SWMP Report No. 16-001014-01.
                                                                  'Design operation flow' (1 year ARI)       2.575    m3/s
                                                                 'Above design flow' (2-100 year ARI)        5.067    m3/s
3   Design Inlet Zone
    Refer to Sedimentation Basin (Chapter 4) for detailed check sheet if applicable
    Is a GPT required?                                                                                       YES      Y/N         Catchment larger than 5ha
                                                                                                                                  Humegard HG45A or appropriate equivalent, maintenance access allowed
                                                 Suitable GPT selected and maintenance considered            YES      Y/N
                                                                                                                                  for.


    Is an Inlet Zone Required?                                                                               NO       Y/N
    Inlet Zone Size
                                                                                                                                  Not Inlet Zone proposed, however an upstream GPT and Bioretention
                                                                  Target Sediment Size for Inlet Zone        N/A      um
                                                                                                                                  Basins are proposed.
                                                                                   Capture efficiency        N/A      %
                                                              Inlet zone area (Figure 4.2 in Chapter 4)      N/A      m2
                                                                                           Vs > Vs:5yr       N/A
    Inlet Zone Connection to Macrophyte zone
                                                                              Overflow pit crest level       N/A      m AHD
                                                                               Overflow pit dimension        N/A      LxW
                                                                               Provision of debris trap      N/A
                                                                          Connection pipe dimension          N/A      mm diam
                                                                          Connection pipe invert level       N/A      m AHD
    High Flow Bypass Weir
                                                                                           Weir Length       N/A      m
                                               High flow bypass crest level (top of extended detention)      N/A      m AHD
                                                                                                                                  Not Applicable - A WQCP is proposed not a wetland (the WQCP is not
4   Designing the Macrophyte Zone
                                                                                                                                  required to achieve WQO's)
                                                                                                                                  As specified in the approved Framework Letter Report (No.B14158.W.07L
                                                                                                                                  dated 8 October 2015), this meets requirement for WQCP macrophyte area
                                                                            Area of Macrophyte Zone          540      m2
                                                                                                                                  (being above 20% of the WQCP water surface). Note that the WQCP is not
                                                                                                                                  required to achieve WQO's.
                                                                                          Aspect Ratio       N/A      L:W
                                                                                                                                  Not Applicable - A WQCP is proposed not a wetland (the WQCP is not
                                                                                  Hydraulic Efficiency       N/A
                                                                                                                                  required to achieve WQO's)
5   Design Macrophyte Zone Outlet
    Riser Outlet
                                                                  Target maximum discharge (Qmax)            0.004    m3/s
                                                        Uniform Detention Time Relationship for Riser         49      hrs
    Maintenance Drain
                                                         Maintenance drainage rate (drain over 12hrs)        N/A      m3/s        Pump out will be required for maintenance
                                                                  Diameter of maintenance drain pipe         N/A      mm          Pump out will be required for maintenance
                                                                 Diameter of maintenance drain valve         N/A      mm          Pump out will be required for maintenance
    Discharge Pipe
                                                                          Diameter of discharge pipe         825      mm
6   Design High Flow Bypass 'Channel'
                                                                                                                                  Energy Dissipaters designed to reduce velocities, Velocity Checks
                                                                                      Longitudinal slope     N/A      %
                                                                                                                                  undertaken through wetland,
                                                                                            Base width       N/A      m
                                                                                          Batter slopes      N/A      H:V
7   Verification Checks
                                                           Macrophyte zone re-suspension protection          0.001    m/s
                                                                                                                                  WQCP was not modelled in MUSIC and is not required to meet site
                                                                     Confirm Treatment Performance           N/A      Y/N
                                                                                                                                  WQO's.
8   RPEQ Verification                                                                    Matthew Starr       MS (RPEQ 9485)