Detailed Stormwater Management Practice Design - Tauranga City ...

More documents

Recommendations

Info

SMG-9 Figure 19 Schematic of a Soakage Pit SMG-9.4.5.1.4 Modular Block Porous Pavement Modular block porous pavement permits precipitation to drain through paving blocks with a pervious opening. Paving blocks are appropriate only for areas with very light or no traffic or for parking pads. They are laid on a gravel subgrade and filled with sand or sandy loam turf but can also be used with grass in the voids which may require irrigation and lawn care during the summer months. Refer to SMG-9 Figure 19a Schematic of a Permeable Pavement. SMG-9 Figure 19aSchematic of a Permeable Pavement Page 38 Updated 01/11/2012
SMG-9.4.5.2 Applicability Soil permeability is the most critical consideration for the suitability of infiltration practices. <strong>Practice</strong>s are generally built in native soil but when this is inappropriate, a soil system can be constructed with media such as sand, peat, or a combination. SMG-9 Table 13 Infiltration Rate for Various Soil Textural Classes provides information on the suitability of various soils for infiltration. The red line indicates that 7 mm is the lowest infiltration rate that is considered acceptable for use of infiltration practices. Infiltration practices normally convey most runoff directly into the soil to eventually enter the groundwater. Constructed soil systems usually require underdrains. SMG-9 Table 13 Infiltration Rate for Various Soil Textural Classes Texture Class Approximate Infiltration Rate (mm/hour) Sand 210 Loamy sand 61 Sandy loam 26 Silt loam 13 Sandy clay loam 7 Clay loam 4.5 Silty clay loam 2.5 Sandy clay 1.5 Silty clay 1.3 Clay 1.0 The next most crucial considerations for the suitability of infiltration practices are: a) Avoiding clogging. b) Avoiding potential to contaminate groundwater. Infiltration practices should be constructed in medium textured soils. They are generally unsuitable for clay because of restricted percolation and for gravel and coarse sands because of the risk of groundwater contamination (unless effective pretreatment is provided). Page 39 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 24 and 25: SMG-9 Figure 11 - Diversion Weir SM
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 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
Page 74 and 75: The design steps are the following:
Page 76 and 77: For the purposes of this guideline,
Page 78 and 79: SMG-9.4.8.7 Detailed Design Procedu
Page 80 and 81: This is indicated on SMG-9 Figure 3
Page 82 and 83: SMG-9 Figure 37 - Waitakere City Co
Page 84 and 85: SMG-9.4.9.7.7 Stormwater Management
Page 86 and 87: SMG-8 Figure 8b - Information on ra
Page 88 and 89: SMG-9.4.10.5 Advantages of Water Ta
Page 90 and 91:
SMG-9 Figure 39 Calculation of Rood
Page 92 and 93:
The 15% wastage factor accounts for
Page 94 and 95:
Commercial and industrial sites wil
Page 96 and 97:
SMG-9 Table 24 Stormwater Managemen
Page 98 and 99:
SMG-9.4.11.2 Separator Size The siz
Page 100 and 101:
VH = Q/1.125 Calculate the surface
Page 102 and 103:
When an outfall is sited in a coast
Page 104 and 105:
SMG-9.5.1.3 Riprap Aprons Outlet pr
Page 106 and 107:
SMG-9 Figure 46 Angled Entry of Out
Page 108 and 109:
SMG-9 - Appendix A Case Studies SMG
Page 110 and 111:
SMG-9 Apx A.2 Filter Strip Case Stu
Page 112 and 113:
SMG-9 Apx A.3 Sand Filter Case Stud
Page 114 and 115:
SMG-9 Apx A.4 Rain Garden Case Stud
Page 116 and 117:
SMG-9 Apx A.5 Infiltration Case Stu
Page 118 and 119:
SMG-9 Apx A.6 Ponds Case Study SMG-
Page 120 and 121:
SMG-9 Table A.6.3 Stage-Storage Rel
Page 122 and 123:
Outflow from ED orifice = Q = 0.62A
Page 124 and 125:
= (Qn/d 1.67 s 0.5 ) - Zd b = ((.04
Page 126 and 127:
SMG-9 Apx A.8.3 Design Water qualit
Page 128 and 129:
SMG-9 Apx A.9 Green Roof Case Study
Page 130 and 131:
Extended detention orifice sizing -
Page 132 and 133:
The minimum width and depth require
Page 134 and 135:
SMG-9 Table B.1.2a Particle Charact
Page 136 and 137:
Particle Diameter (µm) SMG-9 Table
Page 138 and 139:
SMG-9 Figure B.1.3 Wetland Process
Page 140 and 141:
Plants do take up nutrients or meta
show all

Detailed Stormwater Management Practice Design - Tauranga City ...

Create successful ePaper yourself

Delete template?

Save as template?