18164 - SBSMP - Rev 0

Water By Design Bio-Retention Basin Design Checklist
Job No.:        18164
Address:        215 David Low Way, Peregian Beach
Development:    Proposed Reconfiguration of a Lot and Mixed Used Development
Date:           26/11/2019
Author:         DY
Checked:        CG

Item            Description                                                 Detail        Comment
1. Treatment
a.              Catchment area (ha)                                        1.2046
b.              Filter media area (excluding batters) (m2)                   130
c.              Confirm water quality performance meets the
                                                                             Yes
                design objectives
d.              Confirm hydrologic performance meets relevant
                                                                             Yes
                frequent flow objectives
2. Design Inflows
a.              Minor design storm entering system                        Q3month
b.              Minor storm peak flow rate (m3/s)                          0.140
c.                                                                                        High flow pipes from the internal drainage network
                Major design storm entering system                           N/A
                                                                                          directed to detention tank.
d.               Major storm peak flow rate (m3/s)                           N/A
3. Depth Profile
a.                                                                                        Refer to Drawing No.'s 18164/C10 - 18164/C24
                 Bioretention drainage profile type                        Type 2
                                                                                          prepared by Morgan Consulting Engineers.
b.              Minimum drainage layer depth (mm)                            200          Refer comment 3a.
c.              Maximum drainage layer depth (mm)                            248          Refer comment 3a.
d.              Transition layer depth (mm)                                  100          Refer comment 3a.
e.              Saturated zone depth for Type 1 bioretention
                                                                             N/A
                systems
f.              Filter media layer depth (mm)                                400          Refer comment 3a.
g.              Extended detention depth (mm)                                200          Refer comment 3a.
h.
                Maximum water level depth above extended
                                                                             600
                detention for major storm event (mm)
i.              Freeboard to top of embankment (mm)                          200
j.              Total system profile depth (3c+3d+3f+3g+3h+3i)
                                                                            1748
                (mm)
k.              Liner type - (i) Permeable, (ii) Impermeable, (ii)
                                                                        Impermeable       Refer comment 3a.
                None to base
l.
                AASS/PASS assessed and appropriately managed                 N/A
m.              Presence of dispersive soils assessed and
                                                                             N/A
                appropriately managed
4. Design Levels
a.               Outlet invert level (m AHD)                                2.420         Refer comment 3a.
b.               Overflow pit invert level (m AHD)                          2.452         Refer comment 3a.
c.               Minimum drainage layer level (m AHD)                       2.452         Refer comment 3a.
d.               Filter media surface level (m AHD)                         3.200         Refer comment 3a.
e.               Overflow pit crest level (m AHD)                           3.400         Refer comment 3a.
f.               Overflow weir level (m AHD)                                 N/A          Refer comment 2c.
g.               Maximum design water level (m AHD)                         4.000         Refer comment 3a.
h.               Top of embankment/batter level (m AHD)                     4.200         Refer comment 3a.
i.               Inlet/inflow invert level (m AHD)                          3.300         Minimum IL of inlets. Refer comment 3a.
j.               Total level difference (m)                                 1.748
k.               Highest astronomical tide level (m AHD)                     N/A
l.               Groundwater level (m AHD)                                   N/A
5. Layout
a.               Maximum filter media length (m)                            20.45
b.               Maximum filter media width (m)                              6.9
c.               Maximum batter slope (V:H)                                  1:3          Refer comment 3a.
d.               Maximum wall height (m)                                    0.800         Height above filter media surface
e.               Provision for services                                      N/A
f.                                                                                        Private bioretention basin. Shallow depth. Access
                 Maintenance access provided                                 N/A
                                                                                          provided via internal driveway.




                                                26-11-19 - 18164 - Bio det basin design checklist                                        Page 1