Engineering Drawings

                                                                                                                 Bio-Retention Basin Design                                                                                                                                                                             BIORETENTION BASIN NOTES:
 Bio-Retention detailed Design Calculations                                                                                                                                                                                                                                                                             ·        VEGETATION TO COMPLY WITH THE REQUIREMENTS OF APPENDIX "A" OF "HEALTHY WATERWAYS WATER SENSITIVE URBAN DESIGN" TO LOAMY SOILS.
                                                                                                                                                                                                                                                                                                                                 REFER TO LANDSCAPE ARCHITECTS PLANS FOR DETAILS.
                                                                                                                                               Design Flow into Basin - Q3month
                              Filter Media Characteristics                                                                                                                                                                                                                                                              ·        FAWB (FACILITY FOR ADVANCING WATER BIOFILTRATION) ACCREDITED CERTIFICATION FOR FILTRATION MEDIA TO BE FORWARDED TO THE ENGINEER
                                                                                                                                                                    (50% of Q1)
                                                                                                                                                                                                                                                                                                                                 PRIOR TO PLACEMENT.
                                             Filter Media Depth                         0.8          m                                                      Contributing Catchment                                           A=                0.255                ha                                ha
                                Filter Median Particle dia.                         0.45-0.50        mm                                                               Runoff co-efficient                                  C1 =                 0.72                                                                    ·        SUBSOIL DRAINAGE PIPES TO BE UNSOCKED SLOTTED uPVC LAID AT 1:200 MINIMUM GRADE
                               Sat. Hydraulic Conductivity                              180          mm/hr          Recommended                                Time of Concentration                                         tc =                  5                min                              min
                                                                                                                                                                                                                                                                                                                        ·        ALL RIGHT ANGLE SUBSOIL PIPE BENDS ARE TO BE CREATED USING 2x 45° BENDS .
                                                                                                                                                                    Rainfall intensity                                       I1 =               127                 mm/hr                           mm/hr
                                        Filter Material Design                                                                                                                   Q1 = C1I1A                                Q1 =                0.065                cumecs                          cumecs              ·        INSPECTION HOLD POINTS FOR BIORETENTION BASIN CONSTRUCTION ARE AS FOLLOWS.
      Maximum filtration rate through filter media                                                                                                                           % of Q1 event                      Q3month =                       50%                                                                         1.     COMPLETION OF BULK EARTHWORKS.
                                                                                                                                                                                                                                                                                                                            2.     COMPLETION OF SUBSOIL DRAINAGE SYSTEM.
                               Q=kAbase x [(hmax + d)/d]                           Equation 5.5                                                                                                                 Q3month =                      0.032                cumecs                          cumecs                  3.     COMPLETION OF COARSE SAND TRANSITION LAYER.
                                      Saturated conductivity           Ksat =           180          mm/hr          Recommended                                                                                                                                                                                             4.     COMPLETION OF SANDY LOAM FILTRATION MEDIA LAYER.
                                                               =       Ksat =        0.00005         m/s                                                       Overflow Pit/Weir size
                                                                                                                                                                                                                                                                                                                        ·        FLUSH OUT POINTS ARE TO BE FITTED WITH A FIXED INSPECTION OPENING CAP. SCREW ON CAPS ARE NOT ACCEPTABLE.
                                                    Basin Area       Abase =             28          m2                                                                       Q = CwLH3/2
                                            Max. ponding depth        hmax =            0.3          m                                                                 Outlet is sized for                             Q1 ARI                                                                                           ·        SANDY LOAM FILTRATION MEDIA LAYER IS TO BE PROTECTED BY A GEOFABRIC LAYER WITH 75mm TOPSOIL AND TURFED FOR THE DURATION OF
                                              Filter media depth          d=            0.8          m                                                                 Q1 - Q3month                                         Q =                0.032                Cumecs                          Cumecs                       CONSTRUCTION OR APPROVED EQUIVALENT .
                                                                        Q =           0.002          cumecs                                                       Max Weir flow depth                                         h=                 0.1                m                                 m
                                                                        Q =             1.9          L/s                                                                 Weir Co-efficient                                Cw =                  1.66                                                                                                   SCREW CAP AND CONCRETE SURROUND
                                                                                                                                                                         Blockage Factor                                     B=                  0.5                                                                                                      FLUSH OUT POINT. 45° BEND. REFER
                     Flow Capacity of Pipe Perforations                                                                                                           Weir Width Required                                         L=                 1.2                m                                 m                                                           IPWEA STD DWG WSUD-003
                            Based on Vinidex uPVC pipe                                                                                                  Assuming square pit sides are                                            =               0.3                m                                 m
                                                Perforated pipe     Adopting            100          mm
                                                  Clear opening            =           2100          mm2/m                                                           Outlet Pipe Design                                                                                                                                                                                          3
                                                      Slot Width           =            1.5          mm                                                             Q= (1/n)AR2/3S1/2                                                                                                                                                                                                    1
                                                     Slot Length           =            7.5          mm                                                          Mannings roughness                                           n=               0.015                                                                                                                                                                          BASIN SL 5.30
                                               Blockage Factor             =           50%                                                                                           Pipe slope                               S=                0.01                m/m                              m/m
                                      No. of slots per meter               =           93.3                                                                                  Pipe diameter                                    d=                 0.1                m                                 m
                                     Area of Slots per meter               =          1050           mm2/m                                                                           Pipe Area                                A=               0.008                m2                               m2
                                                                                                                                                                        Hydraulic Radius                                      R=               0.025
                                            Q=B Cd A (2gh)^0.5                     Equation 5.6                                                                                     Pipe Flow                                Q=                0.004                cumecs                          cumecs
                                                                                                                                                                                                                                                                                                                                                 GEOTEXTILE CLASS B
                                                Blockage factor          B=            50%                                                                                                                                   Q=                  4.5                l/s                               l/s
                                             Orifice edge factor        Cd =            0.6                         Recommended                       Based on Bio-Ret filter media
                                                          Gravity        g=            9.81          m/s2                                                       Required pipe capacity                                       Q=                  1.9                l/s                               l/s
                                 Max ponding ht over pipe                 h=             1.1         m                                                                                                                                           OK
                                     Area of slots per meter             A=          0.00105         m2
                                                                                                                                                                                                                                                                                                                                                                         100Ø uPVC SLOTTED PIPES FALLING TO
                                   Flow capacity /m of pipe             Q =          0.0015          cumecs
                                                                                                                                                                                                                                                                                                                                                                             STORMWATER PIT AT 0.5% GRADE
                                                   per m of pipe        Q =           1.463          l/s
                                                                                                                                                                                                                                                                                                                                                                    TYPICAL CLEANOUT POINT DETAIL
         Area conveyed by one 100mm dia pipe.                                                                                                                                                                                                                                                                                                                                                                 SCALE 1:20 A1
                                       L=Q/(kW[(hmax+d)/d]
                             Spacing between pipes W =                   W=             1.5          m
                                                                                                                                                                                                                                                                                                                                                                                                                                                       BLOCKWORK RETAINING
                                                                         Q=          0.0015          cumecs                                                                                                                                                                                                                                                                                                   FILTER MEDIA                            WALL REFER STRUCTURAL
                                                                                                                                                                                                                                                                                                                                    BLOCKWORK RETAINING                                                       WIDTH VARIES
                                             Length of Pipe L =           L=           14.2          m                                                                                                                                                                                                                                                                                                                                                      DWGS FOR DETAILS
                                                                                                                                                                                                                                                                                                                                   WALL REFER STRUCTURAL
                               Max Area serviced / pipe =                  =           21.3          m2                                                                                                                                                                                                                                  DWGS FOR DETAILS
                                                                                                                                                                                                                                                                                                                                                                                                          [email protected]
                            Area of Bio-retention basin =                  =             28          m2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                   3
                                  No of pipes required =                   =                 2
                                                                                                                                                                                                                                                                                                                                                                                                                                                               1




                                                                                                                                                                                                                                                                                                                                                                                                                                           300 MIN.
                             Flow Capacity of Trunk Pipe
                                                                                                                                                                                                                                                                                                                                       VEGETATION TO COMPLY WITH THE
        (For pipe flowing full but not under head)                                                                                                                                                                                                                                                                                     REQUIREMENTS OF APPENDIX A OF
                                            Q= (1/n)AR2/3S1/2                                                                                                                                                                                                                                                                    'HEALTHY WATERWAYS WATER SENSITIVE
                                        Mannings roughness                                                                                                                                                                                                                                                                               URBAN DESIGN' TO LOAMY SOILS.
                                                                          n=          0.017




                                                                                                                                                                                                                                                                                                                                                                                                                                           500 MIN.
                                                     Pipe Slope          S=           0.005          m/m                                                                                                                                                                                                            SANDY LOAM HYDRAULIC CONDUCTIVITY 200mm/hr
                                                 Pipe Diameter            d=             0.1         m                                                                                                                                                                                                               IN ACCORDANCE WITH 'GUIDELINE SPECIFICATION
                                                       Pipe Area         A=           0.008          m2                                                                                                                                                                                                                   FOR SOIL MEDIA IN BIORETENTION SYSTEMS,
                                                                                                                                                                                                                                                                                                                     FACILITY FOR ADVANCING WATER BIOFILTRATION'
                                              Hydraulic Radius      R = A/P =        0.0250
                                                                                                                                                                                                                                                                                                                           SOIL ORTHOPHOSPHATE CONTENT NOT TO




                                                                                                                                                                                                                                                                                                                                                                                                                                               MIN
                                                                                                                                                                                                                                                                                                                                                                                                                                           MIN 100
                                                                         Q=           0.003          cumecs                                                                                                                                                                                                         EXCEED 50mg/kg. CERTIFICATION TO BE PROVIDED.
                                                                         Q=             2.8          l/s




                                                                                                                                                                                                                                                                                                                                                                                                                                           200
                                                                                                                                                                                                                                                                                                                                                       TRANSITION LAYER
                           Based on Bio-Ret filter media
                                Required pipe capacity                   Q=             1.9          l/s                                                                                                                                                                                                                                                5mm SCREENINGS
                                                                                        OK                                                                                                                                                                                                                                                               DRAINAGE LAYER
                                                                                                                                                                                                                                                                                                                                                                                                                                    100Ø SLOTTED uPVC PIPE DISCHARGE TO
                                                                                                                                                                                                                                                                                                                                                                                                                                    INLET PIT. PROVIDE 100mm DIA CAPPED uPVC
                                                                                                                                                                                                                                                                                                                                                                                                                                    FLUSH OUT POINTS AT 10.0m (MIN) CTS.



                                                                                                                                                                                                                                                                                                                                                                 TYPICAL BIORETENTION BASIN SECTION
                                                                                                                                                                                                                                                                                                                                                                                                                    N.T.S.

NOTE: ONLY DRAWINGS MARKED "FOR CONSTRUCTION" AND BEARING AN ORIGINAL SIGNATURE SHALL BE USED FOR CONSTRUCTION Design:
                                                                                                               PURPOSES.
                                                                                                                       SWT                                                                                                                                                                                   PROJECT:                                                                                                        DRAWING TITLE:
                                                                                                                                                                                                                                                        ALTA PROJECTS
                                                                                                                              Drawn: SWT
                                                                                                                                                                                                                                                        A.B.N. 611355330                                                                                                                                                     STORMWATER QUALITY BIO BASIN CALCULATIONS AND DETAILS
                                                                                                 FOR APPROVAL                  Date: DEC 2017                                                                                                           26 Memorial Avenue, Cotton Tree                      PROPOSED COMMERCIAL DEVELOPMENT
                                                                                                     NOT FOR CONSTRUCTION                                                                                                                               PO Box 559, Cotton Tree, QLD, 4558                                                                                                                                                                                     Revision    Sheet
  C     28/01/2021    ISSUE FOR APPROVAL                                    S.T.      S.R.                                  Checked:. . . . . . . . . . .
                                                                                                                                                                                                                                                        Tel (07) 5475 4125 Fax (07) 5479 1607                at 30-32 DOONELLA STREET, TEWANTIN QLD                                                                          DRAWING No:
                                                                                                                                                                                                                                                                                                                                                                                                                                              A6035/21/WQ02                      C        2 of 2
  B     27/01/2021    ISSUE FOR APPROVAL                                    S.T.      S.R.          STEPHEN ROBERTS
                                                                                                                                                                                                                                                        Email: [email protected]
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