Detailed Stormwater Management Practice Design - Tauranga City ...

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SMG-9 Figure 11 - Diversion Weir SMG-9 Figure 12 Large Flow Bypass Schematic shows how the system is placed schematically. Page 22 Updated 01/11/2012
SMG-9 Figure 12 - Large Flow Bypass Schematic Most street and road particulate matter is in coarser fractions however, most stormwater contaminants are associated with fine particles. As sand filters have two chambers, the sedimentation chamber will remove the coarse sands and gravels while the filtration chamber will remove the finer silts and clays. Recent work done by the Facility for Advancing Water Biofiltration (FAWB) in Australia has indicated excellent TSS and metals removal with soil and sand-based filters that are non-vegetated (FAWB, 2008). A key element in the conclusion is that wetting and drying are key elements in treatment. SMG-9.4.3.2 Detailed Design Procedure Please refer to DS-5 Stormwater of the Infrastructure Development Code for more design details. The sand filtration chamber is sized by a variation of Darcy’s Law. Af = Vwqdf/k(h+df)tf Where: Af = surface area of sand bed (m 2 ) Vwq = water quality volume df = sand bed depth (m) k = coefficient of permeability for sand (metres/day) h = average depth of water (WQ storm) above surface of sand (m) (1/2 max. depth Page 23 Updated 01/11/2012
Page 1: SMG-9 - Detailed Stormwater Managem
Page 4 and 5: In the same regard reducing total s
Page 6 and 7: As an example, a stormwater managem
Page 8 and 9: SMG-9 Table 2 Stormwater Management
Page 10 and 11: The following points require some d
Page 12 and 13: e) Select a swale shape. Two shapes
Page 14 and 15: SMG-9.4.1.3 Flows in Excess of the
Page 16 and 17: SMG-9.4.1.6 Swale Case Study Refer
Page 18 and 19: SMG-9.4.2.1 Basic Design Parameters
Page 20 and 21: ) Once the peak discharge is determ
Page 26 and 27: tf = time required for runoff to pa
Page 28 and 29: c) Infiltration (depending on soils
Page 30 and 31: Rain Garden design differs only sli
Page 32 and 33: SMG-9.4.4.1.1 Filter Media Filter m
Page 34 and 35: SMG-9.4.4.1.5 Transition Layer The
Page 36 and 37: SMG-9 Table 11 Grasses, Ground Cove
Page 38 and 39: Infiltration practices are used for
Page 40 and 41: SMG-9 Figure 19 Schematic of a Soak
Page 42 and 43: Any impermeable soil layer close to
Page 46 and 47: SMG-9 Figure 21 Soil Textural Trian
Page 48 and 49: e) Calculate the practice depth and
Page 50 and 51: SMG-9.4.6.1 Types of Pond Ponds are
Page 52 and 53: A study in the U.S.A (DNR. 1986) in
Page 54 and 55: Where there are downstream flooding
Page 56 and 57: There may be mitigation requirement
Page 58 and 59: SMG-9.4.6.12 Pond Aesthetics and La
Page 60 and 61: SMG-9 Figure 25 Schematic of a Stor
Page 62 and 63: When an extended detention orifice
Page 64 and 65: The forebay should meet the followi
Page 66 and 67: Requiring, during design, safety fe
Page 68 and 69: Until recently, the filling and dra
Page 70 and 71: The most common design priority for
Page 72 and 73: SMG-9.4.7.1.2 Water Quality Volumes
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The design steps are the following:
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For the purposes of this guideline,
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SMG-9.4.8.7 Detailed Design Procedu
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This is indicated on SMG-9 Figure 3
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SMG-9 Figure 37 - Waitakere City Co
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SMG-9.4.9.7.7 Stormwater Management
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SMG-8 Figure 8b - Information on ra
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SMG-9.4.10.5 Advantages of Water Ta
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SMG-9 Figure 39 Calculation of Rood
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The 15% wastage factor accounts for
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Commercial and industrial sites wil
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SMG-9 Table 24 Stormwater Managemen
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SMG-9.4.11.2 Separator Size The siz
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VH = Q/1.125 Calculate the surface
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When an outfall is sited in a coast
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SMG-9.5.1.3 Riprap Aprons Outlet pr
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SMG-9 Figure 46 Angled Entry of Out
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SMG-9 - Appendix A Case Studies SMG
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SMG-9 Apx A.2 Filter Strip Case Stu
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SMG-9 Apx A.3 Sand Filter Case Stud
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SMG-9 Apx A.4 Rain Garden Case Stud
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SMG-9 Apx A.5 Infiltration Case Stu
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SMG-9 Apx A.6 Ponds Case Study SMG-
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SMG-9 Table A.6.3 Stage-Storage Rel
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Outflow from ED orifice = Q = 0.62A
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= (Qn/d 1.67 s 0.5 ) - Zd b = ((.04
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SMG-9 Apx A.8.3 Design Water qualit
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SMG-9 Apx A.9 Green Roof Case Study
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Extended detention orifice sizing -
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The minimum width and depth require
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SMG-9 Table B.1.2a Particle Charact
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Particle Diameter (µm) SMG-9 Table
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SMG-9 Figure B.1.3 Wetland Process
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Plants do take up nutrients or meta
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Detailed Stormwater Management Practice Design - Tauranga City ...

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