Attachment 6 - Stormwater Management Plan

R0386A: NAMBOUR LANDFILL - STORMWATER MANAGEMENT PLAN



SW2 HES Basin Calculation




                                                                                       SETTLING                                       JAR TEST
                                                                                                                                                        QA                                              MINIMUM
                                 CATCH AREA            BATTERS                          DEPTH         DESIGN       IX yr, 24 hr    SETTLE AFTER                       QA SELECTED     MINIMUM Vs                        GOVERN          ACTUAL VS          DFW       MANUAL
  BASIN ID                                                              L:W RATIO                                                                   OPTIMUM                                                As
                                    (HA)                (1 IN X)                           DS       EVENT (ARI)   (mm/hr)           15 MINUTES                          (L/s/ha)         (m3)                           FACTOR            (m3)             (m)       DFW (m)
                                                                                                                                                     (L/s/ha)                                             (m2)
                                                                                          (m)                                           (mm)




  SW2/4                                7.3                2                 3               1.20         1           5.68              100             17                 9               2696              788         VOLUME             2696            0.20        0.40

  SW2/4                                7.3                2                 3             0.90           1           5.68              100             20                 9               2696              788         VOLUME             2696            0.20




                                                                                                                                   SEDIMENT STORAGE                                                                              APPROX. DIMENSIONS




                                             NUMBER OF                                                                                                                                                                                                               APPROX.
    DECANT            DECANT HOLE             DECANTS                                                                                   CLEAN OUT            MIN SED.         APPROX. REQ          APPROX.          APPROX.           APPROX.                         TOTAL
                                                                   EMPTY SCOUR      FULL SCOUR     SED STORAGE     RUSLE SOIL                                                                                                                           SETTLING
   NUMBER OF           DIAMETER               REQUIRED                                                                                  FREQUENCY            STORAGE          SED STORAGE         LENGTH AT        WIDTH AT           DEPTH AT                      VOLUME AT
                                                                      CHECK           CHECK          OPTION?      LOSS (t/ha/yr)                                                                                                                      VOLUME (m3)
     HOLES               (mm)                  FOR QA                                                                                    (MONTHS)           VOLUME (m3)        DEPTH (m)         SPILLWAY (m)     SPILLWAY (m)      SPILLWAY (m)                     SPILLWAY
                                              SELECTED                                                                                                                                                                                                                  (m3)



        200                 15                  6.5                    OK              OK             RUSLE               100                12                 584                 0.3              89.3             29.8               1.9             2696         4115

        200                 10                  14.6                   OK              OK             RUSLE               100                6                  292                 0.2             100.2             33.4               1.3             2696         3561



Note – Basin is sized based on 1 year ARI based on modelling to achieve 90% treatment of annual runoff. Refer to SW5 Design Report i n Appendix B for further details




Environment. Engineering. Education.                                                                                                                                                PAGE 19