APPENDIX B WORKSHEETS & EXHIBITS
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1 APPENDIX B WORKSHEETS & EXHIBITS A worksheet provides the designer a representation of a measure that allows for input of specific design criteria. The plan designer will be required to assess field conditions and apply engineering principles to determine dimensions and specifications. An exhibit is a representative view of a measure. An exhibit often includes standardized dimensions and specifications. Several exhibits are only a representative view of the measure, and will require the designer to assess field conditions and input dimensions and specifications for the measure. These exhibits have been identified with a note. Worksheet Page Temporary Construction Ingress/Egress Pad Plan View... 5 Worksheet (Large Sites Two Acres or Larger) Temporary Construction Ingress/Egress Pad Cross-Section... 7 View Worksheet (Large Sites Two Acres or Larger) Temporary Construction Ingress/Egress Pad Plan View... 9 Worksheet (Small Sites Less Than Two Acres) Riprap Slope Protection Worksheet Temporary Diversion Worksheet Permanent Diversion Worksheet Perimeter Diversion Dike Worksheet Water Bar Worksheet Rock Check Dam Worksheet Temporary Slope Drain Worksheet Grass-Lined Channel Worksheet Riprap-Lined Channel Worksheet Energy Dissipater Worksheet Energy Dissipater Worksheet Concrete Block Chute Worksheet Excavated Drop Inlet Protection Worksheet Temporary Sediment Trap Rock Dam Worksheet Temporary Sediment Trap Outlet Worksheet October 2007 Appendix B 1
2 APPENDIX B WORKSHEETS & EXHIBITS Worksheet Page Temporary Dry Sediment Basin Earthen Dam/ Embankment Worksheet Temporary Dry Sediment Basin Spillway Worksheet Temporary Dry Sediment Basin Spillway Worksheet Concrete Washout (Above Grade System) Worksheet Concrete Washout (Below Grade System) Worksheet Surface Roughening Stair-Step Worksheet Surface Roughening Grooving Worksheet Exhibit Page Sod Exhibit Perimeter Diversion Dike Exhibit Water Bar Exhibit Rock Check Dam Exhibit Rock Check Dam Exhibit Temporary Slope Drain Exhibit Rock-Lined Chute Exhibit (requires inclusion of dimensions and specifications) Reinforced Vegetated Chute Exhibit (requires inclusion of dimensions and specifications) Excavated Drop Inlet Protection Exhibit Gravel Donut Drop Inlet Protection Exhibit Gravel Donut Drop Inlet Protection Exhibit Geotextile Fabric Drop Inlet Protection Exhibit Geotextile Fabric Drop Inlet Protection Exhibit Appendix B October 2007
3 APPENDIX B WORKSHEETS & EXHIBITS Exhibit Page Straw Bale Drop Inlet Protection Exhibit Straw Bale Drop Inlet Protection Exhibit Block & Gravel Drop Inlet Protection Exhibit Block & Gravel Drop Inlet Protection Exhibit Stone Bag Curb Inlet Protection Exhibit Stone Bag Curb Inlet Protection Exhibit Block & Gravel Curb Inlet Protection Exhibit Block & Gravel Curb Inlet Protection Exhibit Temporary Dry Sediment Basin Riser Pipe Exhibit Silt Fence Exhibit Silt Fence Exhibit Silt Fence Exhibit Straw Bale Dam Exhibit Straw Bale Dam Exhibit Straw Bale Dam Exhibit Straw Bale Dam Exhibit Temporary Stream Crossing Bridges Exhibit (requires inclusion of dimensions and specifications) Temporary Stream Crossing Culverts Exhibit (requires inclusion of dimensions and specifications) Temporary Stream Crossing Fords Exhibit (requires inclusion of dimensions and specifications) Temporary Stream Crossing Fords Exhibit (requires inclusion of dimensions and specifications) October 2007 Appendix B 3
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5 WORKSHEET Temporary Construction Ingress/Egress Pad Plan View Worksheet (large sites two acres or larger) Public Road L = feet Geotextile Fabric Underliner T = inches W = feet INDOT CA No. 2 Aggregate L = Ingress/Egress Pad Length W = Ingress/Egress Pad Width T = Aggregate Thickness Top-Dress First 50 Feet Adjacent to Public Roadway with 2-3 Inches of INDOT CA No. 53 Aggregate (optional) (Note: For minimum dimensions, see the Specifications section of this measure.) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 17 October 2007 Appendix B 5
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7 WORKSHEET Temporary Construction Ingress/Egress Pad Cross-Section View Worksheet (large sites two acres or larger) Diversion Ridge with 3:1 Side Slopes Grade > 2% 15 Feet Public Road Geotextile Fabric Underliner H = inches H = Height of Diversion Ridge (Note: 8 inches minimum) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 17 October 2007 Appendix B 7
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9 WORKSHEET Temporary Construction Ingress/Egress Pad Plan View Worksheet (small sites less than two acres) Public Road L = feet Geotextile Fabric Underliner T = inches W = feet INDOT CA No. 2 Aggregate L = Ingress/Egress Pad Length W = Ingress/Egress Pad Width T = Aggregate Thickness Top-Dress with INDOT CA No. 53 Aggregate (optional) (Note: For minimum dimensions, see the Specifications section of this measure.) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 21 October 2007 Appendix B 9
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11 WORKSHEET Riprap Slope Protection Worksheet T = feet Smooth foundation under bedding material/ filter medium T = feet Bedding material/ filter medium 1.5 T (min.) T = Aggregate Thickness ( 2 x d 50 ) Keyway Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 69 October 2007 Appendix B 11
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13 WORKSHEET Temporary Diversion Worksheet R W = feet C W = feet Allowance for 10% Settlement Flow Protected Area 6 inch freeboard C D = feet All constructed slopes 2:1 or flatter C D = Channel Depth C W = Channel Width R W = Ridge Width For information on this measure, see Chapter 7, page 75 October 2007 Appendix B 13
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15 WORKSHEET Permanent Diversion Worksheet R W = feet C W = feet Allowance for 10% Settlement Flow Protected Area 6 inch freeboard C D = feet All constructed slopes 2:1 or flatter C D = Channel Depth C W = Channel Width R W = Ridge Width For information on this measure, see Chapter 7, page 79 October 2007 Appendix B 15
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17 WORKSHEET Perimeter Diversion Dike Worksheet R W = feet C W = feet Protected Area Allowance for 10% settlement Flow R H = inches R H = Ridge Height R W = Ridge Base Width C D = Channel Depth C W = Channel Top Width 6 inch freeboard All constructed slopes 2:1 or flatter C D = inches Note: Drainage channel is optional. For information on this measure, see Chapter 7, page 83 October 2007 Appendix B 17
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19 WORKSHEET Water Bar Worksheet R W = feet C W = feet Protected Area Allowance for 10% settlement Flow R H = inches R H = Ridge Height R W = Ridge Base Width C D = Channel Depth C W = Channel Top Width 6 inch freeboard All constructed slopes 2:1 or flatter C D = inches Note: Drainage channel is optional. For information on this measure, see Chapter 7, page 89 October 2007 Appendix B 19
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21 WORKSHEET Rock Check Dam Worksheet S D = inches 2:1 or flatter slope Revetment riprap Geotextile fabric Filter medium on up-slope side of check dam S D = Spillway Depth (NOTE: For minimum dimensions see the Specifications section of this measure.) S D = inches Revetment riprap D H = inches Filter medium Geotextile fabric D H = Dam Height S D = Spillway Depth (NOTE: For minimum dimensions see the Specifications section of this measure.) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 97 October 2007 Appendix B 21
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23 WORKSHEET Temporary Slope Drain Worksheet IB W = feet DB W = feet DB H = feet P D = inches TS S = feet IB H = feet Stabilized outlet LS L = feet IB H = Island Berm Height IB W = Island Berm Width DB H = Diversion Berm Height DB W = Diversion Berm Width LS L = Level Section Length TS S = Tie-Down Stake Spacing = Pipe Diameter P D (Note: For minimum and maximum dimensions, see the Specifications section of this measure.) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 103 October 2007 Appendix B 23
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25 WORKSHEET Grass-Lined Channel Worksheet C W = feet C D = feet B W = feet Turf reinforcement mat Erosion control blanket over turf reinforcement mat B W = Designed Bottom Width of Channel C W = Designed Top Width of Channel C D = Designed Depth of Channel For information on this measure, see Chapter 7, page 111 October 2007 Appendix B 25
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27 WORKSHEET Riprap-Lined Channel Worksheet C W = feet C D = feet T = feet B W = feet Geotextile fabric or bedding material B W = Designed Bottom Width of Channel C W = Designed Top Width of Channel C D = Designed Depth of Channel T = Thickness of Riprap Layer For information on this measure, see Chapter 7, page 115 October 2007 Appendix B 27
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29 WORKSHEET Energy Dissipater Worksheet 1 Drain pipe with flared end section Plunge pool (optional) A L = feet Top of apron level with receiving channel Geotextile fabric or well-graded aggregate A T = feet Check slot (optional) Stable outlet A L = Apron Length A T = Apron Thickness For information on this measure, see Chapter 7, page 121 October 2007 Appendix B 29
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31 WORKSHEET Energy Dissipater Worksheet 2 A T = feet Drain pipe Stone placed around end of drain pipe to prevent slope erosion and undercutting of the pipe Stone apron below pipe discharge A W = feet Geotextile fabric or well graded aggregate A T = Apron Thickness A W = Apron Width Note: A W is the apron width at the narrow end of the apron. For information on this measure, see Chapter 7, page 121 October 2007 Appendix B 31
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33 WORKSHEET Concrete Block Chute Worksheet Subsurface drain tile offset from center of channel to prevent seepage of up-slope groundwater B TW = feet :1 slope :1 slope 2:1 or flatter slope Plastic sheeting Bedding material Geotextile fabric Concrete blocks B TW = Berm Top Width Source: Adapted from U.S. Department of Agriculture, Natural Resources Conservation Service For information on this measure, see Chapter 7, page 131 October 2007 Appendix B 33
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35 WORKSHEET Excavated Drop Inlet Protection Worksheet E A = feet x feet 2:1 or flatter slope E D = inches Weep holes for dewatering Aggregate supported by geotextile fabric or hardware cloth E A = Excavated Area (as required) E D = Excavated Depth Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 145 October 2007 Appendix B 35
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37 WORKSHEET Temporary Sediment Trap Rock Dam Worksheet :1 slope T W = feet FP E = feet S D = feet :1 slope 1 foot thick gravel filter D H = feet Geotextile filter fabric A L = Apron Length D H = Dam Height FP E = Flood Pool Elevation S D = Spillway Depth T W = Top Width A L = feet Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 183 October 2007 Appendix B 37
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39 WORKSHEET Temporary Sediment Trap Outlet Worksheet Overfill 6 inches to allow for settlement T = inches : 1 slope S D = inches SB W = feet Geotextile filter fabric : 1 slope RB W = feet RB W = Rock Dam Bottom Width S D = Spillway Depth SB W = Spillway Bottom Width T = Spillway Side-Slope Armament Thickness Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 183 October 2007 Appendix B 39
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41 WORKSHEET Temporary Dry Sediment Basin Earthen Dam/Embankment Worksheet E TW = feet Allowance for 10% settlement :1 slope :1 slope Cut-off Trench E H = feet Hand-compacted fill around barrel/pipe and anti-seep collar Earthen dam/embankment constructed in 6 to 8 inch lifts E H = Earthen Dam/Embankment Height E TW = Earthen Dam/Embankment Top Width (NOTE: For minimum dimensions see the Specifications section of this measure.) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 191 October 2007 Appendix B 41
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43 WORKSHEET Temporay Dry Sediment Basin Spillway Worksheet 1 Riser pipe crest elevation = Emergency spillway crest elevation = FB D = feet Flood pool elevation = :1 slope Anti-flotation block Principal spillway barrel/pipe Cut-off trench Anti-seep collar Stabilized outlet Hand-compacted fill around pipe and anti-seep collar Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 :1 slopes ES W = feet ES W = Emergency Spillway Width FB D = Free Board Depth (NOTE: For minimum dimensions see the Specifications section of this measure.) Source: Adapted from U.S. Department of Agriculture, Natural Resources Conservation Service For information on this measure, see Chapter 7, page 191 October 2007 Appendix B 43
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45 WORKSHEET Temporary Dry Sediment Basin Spillway Worksheet 2 Level portion of spillway Channel approach ES W = feet Flow Earthen dam/embankment 1.5 ES W = feet Slope Slope Flood pool :1 slope FB D = feet Approach channel :1 slope Exit section LS L = feet ES W = Emergency Spillway Width FB D = Free Board Depth LS L = Level Section Length (NOTE: For minimum dimensions see the Specifications section of this measure.) For information on this measure, see Chapter 7, page 191 Source: Adapted from USDA Natural Resources Conservation Service October 2007 Appendix B 45
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47 WORKSHEET Concrete Washout (Above Grade System) Worksheet For information on this measure, see Chapter 7, page 247 October 2007 Appendix B 47
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49 WORKSHEET Concrete Washout (Below Grade System) Worksheet For information on this measure, see Chapter 7, page 247 October 2007 Appendix B 49
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51 WORKSHEET Surface Roughening Stair-Step Worksheet Slope V = inches H = inches H = Horizontal Cut V = Vertical Cut H > V Note: See Roughening Slopes (Not to be Mowed) under the Specifications section of this measure. Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 297 October 2007 Appendix B 51
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53 WORKSHEET Surface Roughening Grooving Worksheet G D = inches G W = inches G D = Groove Depth G W = Groove Width Note: See Roughening Slopes (Not to be Mowed) under the Specifications section of this measure. Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 297 October 2007 Appendix B 53
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55 EXHIBIT Sod Exhibit 1 Perspective View Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 47 October 2007 Appendix B 55
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57 EXHIBIT Perimeter Diversion Dike Exhibit 1 Flow Flow Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 83 October 2007 Appendix B 57
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59 EXHIBIT Water Bar Exhibit 1 For information on this measure, see Chapter 7, page 89 October 2007 Appendix B 59
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61 EXHIBIT Rock Check Dam Exhibit 1 A B A B A = Crest of Dam B = Toe of Dam For information on this measure, see Chapter 7, page 97 October 2007 Appendix B 61
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63 EXHIBIT Rock Check Dam Exhibit 2 Flow Filter medium Revetment riprap Channel bottom width Channel top width For information on this measure, see Chapter 7, page 97 October 2007 Appendix B 63
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65 EXHIBIT Temporary Slope Drain Exhibit 1 Diversion berm Diversion channel Anchor stake spacing (maximum of 10 feet) Flow Corrugated, non-perforated, plastic drain pipe Anchor stakes Stablized outlet Earthen island over inlet section of drain Level section (4 foot min.) For information on this measure, see Chapter 7, page 103 October 2007 Appendix B 65
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67 EXHIBIT Rock-Lined Chute Exhibit 1 Flow Riprap placed over geotextile fabric Subsurface drain tile offset from center of channel to prevent seepage of up-slope groundwater NOTE: This measure requires the designer to provide design specifications and dimensions. Source: Adapted from USDA Natural Resources Conservation Service For information on this measure, see Chapter 7, page 127 October 2007 Appendix B 67
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69 EXHIBIT Reinforced Vegetated Chute Exhibit 1 Aggregate or crushed stone Erosion control blanket over turf-reinforcement mat Flow Riprap over geotextile fabric Subsurface drain tile offset from center of channel to prevent seepage of up-slope NOTE: This measure requires the designer to provide design specifications and dimensions. Source: Adapted from USDA Natural Resources Conservation Service For information on this measure, see Chapter 7, page 135 October 2007 Appendix B 69
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71 EXHIBIT Excavated Drop Inlet Protection Exhibit 1 Flow Main Flow Flow Flow Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 145 October 2007 Appendix B 71
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73 EXHIBIT Gravel Donut Drop Inlet Protection Exhibit 1 For information on this measure, see Chapter 7, page 149 October 2007 Appendix B 73
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75 EXHIBIT Gravel Donut Drop Inlet Protection Exhibit 2 Filter stone (1 foot thick) 2:1 or flatter slope 3:1 or flatter slope 1 to 2 feet Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 149 October 2007 Appendix B 75
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77 EXHIBIT Geotextile Fabric Drop Inlet Protection Exhibit 1 36 inches (maximum) Cross bracing 12 to 18 inches 18 inches (minimum) Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 153 October 2007 Appendix B 77
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79 EXHIBIT Geotextile Fabric Drop Inlet Protection Exhibit 2 Geotextile fabric Secured with lathe Compacted fill 36 inch (min.) hardwood post Flow 8 inches 18 inches (min.) Geotextile fabric laid on down-slope side and bottom of trench 4 inches For information on this measure, see Chapter 7, page 153 October 2007 Appendix B 79
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81 EXHIBIT Straw Bale Drop Inlet Protection Exhibit 1 Two stakes per straw bale Source: Adapted from Michigan Soil Erosion and Sedimentation Control Guidebook, 1975 For information on this measure, see Chapter 7, page 159 October 2007 Appendix B 81
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83 EXHIBIT Straw Bale Drop Inlet Protection Exhibit 2 Compacted fill to prevent piping Flow Bale turned on its side to prevent deterioration of bindings Bales entrenched four (4) inches into the soil Source: Adapted from Michigan Soil Erosion and Sedimentation Control Guidebook, 1975 For information on this measure, see Chapter 7, page 159 October 2007 Appendix B 83
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85 EXHIBIT Block & Gravel Drop Inlet Protection Exhibit 1 One concrete block, in bottom row of blocks on each side of structure, laid horizontally to allow for dewatering Aggregate blanket with 2:1 slope or flatter Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 163 October 2007 Appendix B 85
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87 EXHIBIT Block & Gravel Drop Inlet Protection Exhibit 2 Concrete block laid horizontally for dewatering Hardware cloth 2:1 or flatter slope Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 163 October 2007 Appendix B 87
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89 EXHIBIT Stone Bag Curb Inlet Protection Exhibit 1 For information on this measure, see Chapter 7, page 169 October 2007 Appendix B 89
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91 EXHIBIT Stone Bag Curb Inlet Protection Exhibit 2 Upper layer(s) of stone bags overlapped onto back of curb Flow Spillway at or below curb height Flow Stone bags tightly stacked and abutted together For information on this measure, see Chapter 7, page 169 October 2007 Appendix B 91
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93 EXHIBIT Block & Gravel Curb Inlet Protection Exhibit 1 Source: Adapted from Virginia Department of Conservation and Recreation, Division of Soil and Water Conservation For information on this measure, see Chapter 7, page 173 October 2007 Appendix B 93
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95 EXHIBIT Block & Gravel Curb Inlet Protection Exhibit 2 Filter aggregate Blocks laid with openings horizontal to the pavement to allow for drainage Hardware cloth 2 x 4 wooden stud For information on this measure, see Chapter 7, page 173 October 2007 Appendix B 95
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97 EXHIBIT Temporary Dry Sediment Basin Riser Pipe Exhibit 1 Perforated riser pipe with trash guard 12 inches of filter aggregate over perforations (min.) Emergency spillway crest Hardware cloth or wire mesh to prevent aggregate from plugging perforations One foot (min.) INDOT CA No. 5 aggregate filter stone over filter pack Riprap or INDOT CA No. 2 aggregate filter pack Anti-flotation block NOTE: For minimum dimensions see the Specifications section of this measure. Source: Adapted from North Carolina Erosion and Sediment Control Planning and Design Manual, 1993 For information on this measure, see Chapter 7, page 191 October 2007 Appendix B 97
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99 EXHIBIT Silt Fence Exhibit Silt Fence End of silt fence turned up-slope to prevent bypass flow and allow for ponding of stormwater runoff Source: Adapted from Commonwealth of Pennsylvania Erosion and Sediment Pollution Control Program Manual, 1990 For information on this measure, see Chapter 7, page 215 October 2007 Appendix B 99
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101 EXHIBIT Silt Fence Exhibit 2 Geotextile fabric secured with lathe Compacted fill 36 inch (min.) hardwood post Flow 8 inches 18 inches (min.) Geotextile fabric laid on down-slope side and bottom of trench 4 inches For information on this measure, see Chapter 7, page 215 October 2007 Appendix B 101
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103 EXHIBIT Silt Fence Exhibit 3 Post Silt Fence For information on this measure, see Chapter 7, page 215 October 2007 Appendix B 103
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105 EXHIBIT Straw Bale Dam Exhibit Turn ends of straw bale dam up slope to prevent bypass flow and allow for ponding of storm water runoff Source: Adapted from Minnesota Pollution Control Agency, Minnesota Construction Site Erosion and Sediment Control Planning Handbook, 1987 For information on this measure, see Chapter 7, page 223 October 2007 Appendix B 105
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107 EXHIBIT Straw Bale Dam Exhibit 2 10 foot minimum spacing from toe of slope to allow for ponding of stormwater runoff Source: California Regional Water Quality Control Board, San Francisco Bay Region Erosion and Sediment Control Field Manual, Second Edition For information on this measure, see Chapter 7, page 223 October 2007 Appendix B 107
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109 EXHIBIT Straw Bale Dam Exhibit 3 For information on this measure, see Chapter 7, page 223 October 2007 Appendix B 109
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111 EXHIBIT Straw Bale Dam Exhibit 4 For information on this measure, see Chapter 7, page 223 October 2007 Appendix B 111
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113 EXHIBIT Temporary Stream Crossing - Bridges Exhibit 1 NOTE: This measure requires the designer to provide design specifications and dimensions. For information on this measure, see Chapter 7, page 267 October 2007 Appendix B 113
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115 EXHIBIT Exhibit 1 Temporary Stream Crossing - Culverts NOTE: This measure requires the designer to provide design specifications and dimensions. For information on this measure, see Chapter 7, page 273 October 2007 Appendix B 115
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117 EXHIBIT Temporary Stream Crossing - Fords Exhibit 1 Stone over geotextile fabric 5 foot (max.) bank height All excavated slopes 2:1 or flatter Flow Road alignment straight for a minimum of 30 feet (min.) Temporary diversion channel NOTE: This measure requires the designer to provide design specifications and dimensions. Source: Adapted from Virginia Department of Conservation and Recreation, Division of Soil and Water Conservation, 1992 For information on this measure, see Chapter 7, page 279 October 2007 Appendix B 117
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119 EXHIBIT Temporary Stream Crossing - Fords Exhibit 2 Temporary diversion channel 5 foot maximum bank height Temporary diversion channel 5:1 slope (max.) Geotextile fabric for stabilization and separation NOTE: This measure requires the designer to provide design specifications and dimensions. Source: Adapted from Virginia Department of Conservation and Recreation, Division of Soil and Water Conservation, 1992 For information on this measure, see Chapter 7, page 279 October 2007 Appendix B 119
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