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16-001014-02A (Ultimate SCMMP)
Attached to the e-mail Operational Works Application OPW16/0203 - 4 of 4.
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Design Check and Summary (Derived from Table 22 of the WBD Bioretention Technical Design Guidelines, 2012)
Item Description Detail Recommendation
Northern Basin Central Basin Southern Basin Unit
1. Treatment
(a) Catchment area 2.5 5.5 5 ha
(b) Filter media area( excluding batters 525 180 305 m2 2
Single or multiple cells < 800m each
Confirm water quality performance meets the design Refer to Section 4.5 of latest issue of SWMP Report (No. 16‐001014‐
(c)
objectives 01)
Confirm hydrologic performance meets relevant frequent Under the SPP, 2014 frequent flow objectives are no longer a
(d)
flow objectives requirement for SEQ.
2. Design Inflows
(a) Minor design storm entering system 10% AEP 10% AEP 10% AEP AEP (%)
3
(b) Minor storm peak flow rate 1.08 1.31 2.08 m /s
(c) Major design storm entering system 1% AEP 1% AEP 1% AEP ARI
3
(d) Major storm peak flow rate 1.51 1.67 2.69 m /s
3. Depth Profile
(a) Bioretention drainage profile type Type 3 Conventional Type 3 Conventional Type 3 Conventional Type
See section 3.2.2.3 and 3.2.2.4 for "Type 1"
≥ 150 mm for"Type 2"
(b) Minimum drainage layer depth 300 300 300 mm
≥ 300 mm for "Type 3"
Not needed for "Type 4"
(c) Maximum drainage layer depth 400 300 400 mm Same as minimum except for"Type 2"
See Section 3.2.2.4 for"Type 1"
(d) Transition layer depth 100 100 100 mm
≥ 100 mm for "Type 2':"Type 3" and "Type 4"
(e) Saturated zone depth for Type 1 bioretention systems N/A N/A N/A mm See section 3.2.2.4
(f) Filter media layer depth 400 400 400 mm ≥ 400mm (≥ 700mm with trees)
(g) Extended detention depth 300 300 300 mm ≤ 300mm
Maximum water level depth above extended detention for
(h) 1100 450 446 mm
major storm event
(i) Freeboard to top of embankment 300 0 554 mm Multiple, see section 3.2.3.6
(j) Total system profile depth [3(c)+3(d)+3(f)+3(h)+3(i)] 2500 1550 2100 mm = 4(j)
Liner type Bidum A12 Geotextile Bidum A12 Geotextile Bidum A12 Geotextile Subject to drainage profile type and in‐situ
(k)
(i) Permeable (ii) Impermeable (iii) None to base Fabric Fabric Fabric soils/groundwater (see section 3.2.4)
Geotechnical Engineer Geotechnical Engineer Geotechnical Engineer
(l) AASS/PASS assessed and appropriately managed
to assess to assess to assess
Presence of dispersive soils assessed and appropriately Geotechnical Engineer Geotechnical Engineer Geotechnical Engineer
(m)
managed to assess to assess to assess
4. Design Levels
(a) Outlet invert level 98 99.25 100.15 m AHD
(b) Overflow pit invert level 98 99.25 100.15 m AHD
(c) Minimum drainage layer level 98.3 99.25 100.9 m AHD
(d) Filter media surface level 99.1 100.05 101.7 m AHD
(e) Overflow pit crest level 99.4 (Orifice) 100.35 102 m AHD
(f) Overflow weir level 100.4 100.5 102.7 m AHD
(g) Maximum design water level 100.1 101.03 102.45 m AHD
(h) Top of embankment/batter level 100.8 100.8 103 m AHD
(i) Inlet/inflow invert level 99.1 100.05 101.7 m AHD
(j) Total level difference [4(h)‐4(c)] 2.5 1.55 2.1 m = 3(j)
"Type 1"‐impermeable liner extends
≥ 300 mm above HAT
(k) Highest astronomical tide level Non‐Tidal Non‐Tidal Non‐Tidal m AHD "Type 2'; "Type 3"and "Type 4"‐ ba se of
transition layer ≥ 300 mm above HAT
Geotechnical Engineer Geotechnical Engineer Geotechnical Engineer
(l) Groundwater level m AHD Varies with drainage profile type, see Table 8
to assess to assess to assess
5. Layout
(a) Maximum filter media length 40 31 20 m ≤ 40m
(b) Maximum filter media width. 19 8 15 m ≤ 20m (preferred ≤ 15m)
(c) Maximum batter slope 1:3 V:H 1:4 V:H 1:4 V:H V:H
(d) Maximum wall height (where applicable) N/A 1.8 1 m
Provision for services (water, sewer, gas, No Services Through No Services Through No Services Through
(e)
telecommunications, stormwater) Basin Basin Basin
(f) Maintenance access provided Yes Yes Yes
Flood storage volume above extended detention (where 3
(g) 1,030 4,620 221 m
bioretention combined with flood storage)
6. Inlet Design
Inlet/inflow type
(a) Pipe & Sheet Flow Pipe & Sheet Flow Pipe & Sheet Flow
(i) pipe (ii) channel (iii) sheet flow (iv) other
No Diversion ‐ No Diversion ‐ No Diversion ‐
(b) Diversion/surcharge type (where applicable)
Detention Proposed Detention Proposed Detention Proposed
Coarse sediment removal
(c) Sediment Forebay GPT GPT
(i) forebay (ii) inlet pond (iii) swale (iv) other
2
(d) Coarse sediment removal area 6m3 required *2.6m3 required *2.4m3 required m
(e) Coarse sediment removal depth 0.2m *2.6m3 required *2.4m3 required m2
(f) Coarse sediment clean‐out frequency 1 1 1 < once per year
(g) Flow distribution type Multiple Inflow Points N/A N/A Required if filter media area > 400 m 2
Refer to Energy Refer to Energy Refer to Energy
(h) Confirm scour protection at inflow
Dissipator Calculations Dissipator Calculations Dissipator Calculations
(i) Minor storm flow velocity over filter 0.4 0.58 0.43 m/s < 1.0m/s
(j) Major storm flow velocity over filter 0.46 0.63 0.47 m/s < 1.0m/s
7. Underdrainage (outlet design)
(a) Filter media saturated hydraulic conductivity 200 200 200 mm/hr 100 ‐ 300 mm/hr
(b) Maximum filter infiltration capacity 0.051 0.017 0.03 m3/s
Underdrain capacity 3
(c) 0.068 0.022 0.032 m /s > 7(b)
(taking into account blockage factors)
8. Overflow Design (outlet design)
(a) Overflow pit type Field Inlet Field Inlet Field Inlet
(b) Overflow pit dimensions 900 x 900 600 x 600 1200 x 1200
(c) Overflow weir length 4 5 6 m
Overflow pit capacity (taking into account blockage 3
(d) 0.46 0.23 1.25 m /s > 2(b)
factors)
Overflow pit plus overflow weir capacity (taking into 3
(e) 2.92 2.1 6.51 m /s > 2(d)
account blockage factors)
(f) Outlet pipe size 375 825 900 mm
Refer to Energy Refer to Energy Refer to Energy
(g) Appropriate outlet scour protection provided
Dissipator Calculations Dissipator Calculations Dissipator Calculations
9. Vegetation Design
Planting style
(a) (i) small scale urban (ii) med‐large scale urban (ii) or (iii) (ii) or (iii) (ii) or (iii)
(iii) bushland
No Bioretention Trees No Bioretention Trees No Bioretention Trees
(b) Trees and shrubs to be included (yes/no)
proposed proposed proposed
(c) Species diversity (number of species) Yes Yes Yes Refer Table 19
Refer to Landscaping Refer to Landscaping Refer to Landscaping
(d) Species selection refer to plan: ____ ≥ 50% coverage with plants from Table 20
Plans Plans Plans
Refer to Landscaping Refer to Landscaping Refer to Landscaping 2 May vary between plant species, refer to plan if
(e) Planting density /m
Plans Plans Plans required
Refer to Landscaping Refer to Landscaping Refer to Landscaping
(f) Mulch type and depth See section 3.6.7 and section 4.4.4
Plans Plans Plans
Matthew Starr (RPEQ 9485)
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