Drainage Design Manual - the City of San Luis Obispo

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intersections, fencing shall prevent public access to channel or culvert, and 4.3-m (14-ft)wide chain-link drive gates shall be provided at all points of access to maintenance ways,or to channels not requiring maintenance ways. Chain link fence should be vinyl coatedor as required by the Planning Department to address durability and aesthetics.For minor channels with depth less than 900 mm (3 ft), or for small, localized areassteeper than 5:1 on other channels, the City Engineer or County Public Works Directormay allow the fence requirement to be waived.7.4.7 Drainage EasementsDrainage facilities must be located in a public street, road or lane, or within a publicdrainage easement. Necessary dedication for lines to be constructed on private propertymust be completed before the improvement will be approved for construction.Where a minor improvement of a drainage facility falls on adjacent property, writtenpermission from the adjacent property owners for such construction and a copy of theapproval of the adjacent owners shall be submitted to the City Engineer or County PublicWork Director, prior to approval of the improvement plans. Agreements betweenproperty owners shall hold the City or County harmless from any damage claim arisingfrom said agreement.Drainage easements shall be used for drainage purposes exclusively and shall not becombined with easements required for other public utility purposes unless it can beshown to the City Engineer or County Public Works Director that dual use of saideasement will not be conflicting.For natural waterways, drainage easement or right of way (when required) shall beprovided which includes the entire waterway area plus freeboard. In some locations theCity or County may also require dedication of an access or maintenance road. Prior tofinal approval, the easement shall be staked by the developer or project proponent’sengineer and reviewed by the City or County Public Works Director. In the case of anatural waterway having banks with side slopes steeper than two horizontal to onevertical, (2H:1V) the right of way may be required to be increased to provide width fornot less that 2 to 1 slopes from the existing toe of bank, plus a 7.6-m (25-ft) wide bufferstrip. Additional right of way will also be required where unstable ground conditionsexist as determined by the City Engineer or County Public Works Director, based ondetailed geotechnical, geomorphic and hydraulic studies completed by the projectproponent or Developer. Procedures for completing detailed studies are outlined inSection 4.0.SLO Creek Drainage Design Manual 96 February 2003
7.4.8 Easements for Closed ConduitsEasements for closed conduits shall meet the following requirements:Minimum width of 3 m (10 ft) with pipe centered 0.75 m (2.5 ft) from the north or westedge. Whenever possible, rights of way for closed conduits shall be along or adjacent toproperty lines and outside of areas where structures are planned.On pipes of 600 mm (24 in) diameter and greater, or trenches exceeding 1.5 m (5 ft) indepth, the easement shall have additional width to provide ample working space asrequired by the City Engineer or County Public Works Director.Provide access and working space rights.7.4.9 Property Rights for Open ChannelsProperty rights for major and intermediate open conduits shall have sufficient width to containthe open channel with side slopes, and at least one, 4.5-m (15-foot) wide service road.The City Engineer or County Public Works Director may waive this requirement alongconstructed natural channels or open channels in parks and open space areas with good access.SLO Creek Drainage Design Manual 97 February 2003
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San Luis Obispo CreekWaterway Manag
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SECTION 4.0 HYDROLOGIC & HYDRAULIC
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SECTION 8.0 DESIGN OF DRAINAGE PUMP
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11.12 Erosion Control Seeding......
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DRAINAGE DESIGN MANUALFOR THECITY O
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ôó1Ragged PointSan SimeonCambriaM
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SECTION 2.0PROJECTS REQUIRING HYDRO
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3. or, is an individual development
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• Geomorphic, Geotechnical and St
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SECTION 3.0CORE REQUIREMENTS AND RE
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elevations, and existing channel st
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1000 0 1000 Meters1 0 1 MilesCity L
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N300 0 300 MetersLEGEND100-Year Flo
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• All streets to be dedicated to
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• A minimum setback of 15 m (50 f
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3.6.4 Preference for Vegetative and
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compliance with the measures prescr
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4.1 Hydrologic Analysis4.1.1 Genera
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Table 4-1Runoff CoefficientsHydrolo
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Overland Flow TimeSLO Creek Phase I
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Channel or Pipe Flow occurs where f
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45745766071176260955855860971166050
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Table 4-3Rainfall - Intensity Data
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4.1.4 Example ProblemA sample basin
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Table 4-7Example Composite Runoff C
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Table 4-9Example Rational Method Ru
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developed. For minor waterways and
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SECTION 5.0OPEN CHANNEL ANALYSIS AN
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case, a Natural Channel may be modi
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5.2 Channel Design Flow Requirement
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maintenance to maintain the design
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The following guidelines should be
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Channel PlanformDrainage Design Man
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• Native vegetation shall be pres
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Manning’s Roughness Values are pr
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6.1 GeneralSECTION 6.0ANALYSIS & DE
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6.3 Design ReferencesThe designer i
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stream stabilization needs totaling
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causes and modes of failure act tog
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(permissive velocity) and/or bounda
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Re-run the model after coding in th
Page 89 and 90: Step 2 - Develop and Screen Alterna
Page 91 and 92: Cost. The design must be cost effec
Page 93 and 94: Step 3 - Develop Concept Plan and D
Page 95 and 96: Legally it is up to the applicant t
Page 97 and 98: e necessary, as well as other work
Page 99 and 100: (0.6-0.9 m)(0.6-0.9 m)(152-203 mm)L
Page 101 and 102: (1.2 m)(1.2 m)(12 mm to 51 mm)(1.5
Page 103 and 104: (0.9 m)(0.6 m x 0.6 m x 914 mm)(457
Page 105 and 106: (0.6 - 0.9 m)Vegetated GeogridDrain
Page 107 and 108: Planted Rip RapDrainage Design Manu
Page 109 and 110: A-JacksDrainage Design ManualCity &
Page 111 and 112: (1.5 m)(13 to 25 mm)(0.6 to 0.9 m)R
Page 113 and 114: (13 - 25 mm)(0.6 to 0.9 m)Planted G
Page 115 and 116: (2.4 m)(2.4 m)Flow DeflectorsDraina
Page 117 and 118: performance. This technique require
Page 119 and 120: Boulder ClustersDrainage Design Man
Page 121 and 122: of a bend, and filled around and on
Page 123 and 124: horizontal line are SI (metric) nam
Page 125 and 126: GRADING OF ROCK SLOPE PROTECTION PE
Page 127 and 128: A layer of Backing No. 1 or No. 2 i
Page 129 and 130: SECTION 7.0DESIGN OF CONDUITS, CULV
Page 131 and 132: 7.2.3 Storm Drain Location and Alig
Page 133 and 134: In paved areas, pipe cover shall be
Page 135 and 136: • Drop inlets shall be spaced suc
Page 137 and 138: Marine Fisheries Service NMFS South
Page 139: For all intermediate channels, eith
Page 143 and 144: SECTION 9.0STORMWATER MANAGEMENT FA
Page 145 and 146: Detention for the 10-year design st
Page 147 and 148: 9.2.1 Provisions For SedimentationT
Page 149 and 150: 9.5 Basin DesignDetention and reten
Page 151 and 152: mm (24 in). A corrugated metal pipe
Page 153 and 154: have side panels or other devices t
Page 155 and 156: SECTION 10.0EROSION CONTROL AND STO
Page 157 and 158: 10.3.1 Gravel Construction Entrance
Page 159 and 160: Notes:1. PLACE BALES PERPENDICULAR
Page 161 and 162: • Filter fences (also known as si
Page 163 and 164: SEED MIX ONE(Application rate = 40
Page 165 and 166: • Description of soils, geology,
Page 167 and 168: • The facilities shown on this pl
Page 169 and 170: The following control measures are
Page 171 and 172: BMP 3 Dewatering OperationsI. Defin
Page 173 and 174: BMP 5 Illicit Connection/Illegal Di
Page 175 and 176: D. All vehicles/equipment that regu
Page 177 and 178: I. Properly dispose of or recycle u
Page 179 and 180: BMP 12 Solid Waste ManagementI. Def
Page 181 and 182: H. Temporary washout facilities sha
Page 183 and 184: SECTION 11.0RIPARIAN REVEGETATION P
Page 185 and 186: per second (6 feet per second). Whi
Page 187 and 188: TABLE 11-2: WOODY SHRUBS FOR SAN LU
Page 189 and 190: TABLE 11-4: GRASSES AND HERBSFOR SA
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TABLE 11-5: MARSH PLANTS FOR SAN LU
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11.4 Planting Site Considerations11
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Where vandalism is not a problem, t
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Table 11-6Recommended Species Compo
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Larger Crown TreesPlant in clusters
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plant materials (often one growing
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Exotic Treeto be RemovedNative Tree
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Step 4: Select plants suitable for
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• Exotic vegetation on the site s
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• Removal of Exotic VegetationThe
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Placement of weed control fabric or
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11.12 Erosion Control SeedingRevege
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y wind or water runoff; should be e
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Abrasion. Removal of streambank soi
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Confluence. A junction of streams o
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Flood. A general and temporary cond
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Left Bank. The left-hand bank of st
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Shear stress. The force per unit ar
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Velocity (of water in a stream). Th
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Association of Bay Area Governments
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Hoover, Robert F. 1970. The Vascula
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U.S. Army Corps of Engineers, April
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Drainage Design Manual - the City of San Luis Obispo

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