Attachment 6 - Stormwater Management Plan

R1767: NOOSA LANDFILL: CLEAN WATER DRAIN AND HES BASIN (SW5) – DESIGN REPORT & MAINTENANCE AND INSPECTION PLAN



1 YEAR ARI 24 HOUR TYPE A SEDIMENT BASIN

                                                                                                                                                                                                                                                                                            NUMBER
                                                                                                                  JAR TEST
                                                                       SETTLING                                                                                                                                                                          DECANT           DECANT               OF
                        CATCH                                                          DESIGN                      SETTLE          QA                QA        MINIMUM       MINIMUM                         ACTUAL                                                                                       EMPTY         FULL
                                       BATTERS          L:W             DEPTH                      IX yr, 24 hr                                                                               GOVERN                          DFW      MANUAL            NUMBER            HOLE             DECANTS
  BASIN ID               AREA                                                          EVENT                      AFTER 15     OPTIMUM           SELECTED         Vs            As                             VS                                                                                         SCOUR        SCOUR
                                        (1 IN X)       RATIO               DS                     (mm/hr)                                                                                     FACTOR                          (m)      DFW (m)             OF            DIAMETER           REQUIRED
                         (HA)                                                           (ARI)                     MINUTES       (L/s/ha)          (L/s/ha)       (m3)          (m2)                           (m3)                                                                                        CHECK        CHECK
                                                                          (m)                                                                                                                                                                             HOLES            (mm)              FOR QA
                                                                                                                    (mm)
                                                                                                                                                                                                                                                                                            SELECTED


  SW5                     4.5             2                 3            1.20            1           5.68            100             17             9            1662            486          VOLUME          1662            0.20           0.50             200             17              3.1          OK            OK




LEVEL SPREADER

                                                                                                                                                                                                                                                             WEIR




                                                                                                                                                                                                                                                                                            MIN. HEIGHT
                                                   CATCH AREA                                                           TIME OF CONC                                    FLOW - Q                                  SIDE SLOPE 1         U/S WATER                                                                  TOP WIDTH
  BASIN ID                                                                       ARI                  CARI                                           IARI                                BASE WIDTH                                                             FREEBOARD (m)               SPILLWAY TO
                                                      (HA)                                                                 (MINS)                                         (m3/s)                                     (1 in x)           LEVEL (m)                                                                    (m)
                                                                                                                                                                                                                                                                                              TOB (m)




  LEVEL SPREADER Q10                                   4.5                        10                   0.7                    15                    152                   1.33                  16                     2                      0.13                      0.3                    0.43                 17.73

  LEVEL SPREADER Q100                                  4.5                       100                  0.84                    15                     217                  2.28                  16                     2                      0.19                      0.3                    0.49                 17.96




EMERGENCY SPILLWAY

                                                                                                                                          WEIR                                                                             CHUTE                                                                    DISSIPATER



                                                                                                                   SIDE                                        MIN.                                                                                                                MEAN
                                                                 TIME                                                         U/S                                                                                                                    DEPTH           DEPTH
                         CATCH                                                           FLOW                     SLOPE                                       HEIGHT        TOP        LONG.           ROCK          MANNING         DESIGN                                        ROCK       WIDTH
                                                                  OF                              BASE                       WATER        FREEBOARD                                                                                                    OF             WITH                                WIDTH       LENGTH
  BASIN ID                AREA          ARI          CARI                       IARI      -Q                         1                                       SPILLWAY      WIDTH       SLOPE         SIZE - D50       ROUGH            VEL                                         SIZE -       1
                                                                 CONC                             WIDTH                      LEVEL            (m)                                                                                                    FLOW           F/BOARD                               2 (m)         (m)
                          (HA)                                                           (m3/s)                    (1 in                                      TO TOB        (m)        (m/m)           (mm)            COEFF          (m/s)                                         D50        (m)
                                                                (MINS)                                                        (m)                                                                                                                     (m)              (m)
                                                                                                                    x)                                          (m)                                                                                                                (mm)



  SPILLWAY Q100             4.5         100          0.7          15            217       1.90        15            2         0.17           0.3               0.47         16.90      0.25             93            0.087           1.24            0.10           0.40           100         17.2       17.4          2.1




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